304 capillary tube Nanocomposites dabere na Tungsten Oxide/Fullerene dị ka Electrocatalysts na Inhibitors nke Parasitic VO2+/VO2+ Reactions in Mixed Acids

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Igwe anaghị agba nchara 304 Coil Tube Chemical mejupụtara

304 Igwe anaghị agba nchara Coil Tube bụ ụdị austenitic chromium-nickel alloy.Dị ka igwe anaghị agba nchara 304 Coil Tube Manufacturer si kwuo, isi ihe dị na ya bụ Cr (17%-19%), na Ni (8%-10.5%).Iji meziwanye nguzogide ya na corrosion, enwere obere Mn (2%) na Si (0.75%).

Njirimara igwe anaghị agba nchara 304 Coil Tube Mechanical Properties

Njirimara igwe nke 304 igwe anaghị agba nchara eriri igwe bụ ndị a:

• Ike nkwụsịtụ: ≥515MPa
• Ike mpụta: ≥205MPa
• Mgbatị: ≥30%

Ngwa & ojiji nke igwe anaghị agba nchara 304 Coil Tube

Ọnụ ego dị oke ọnụ nke vanadium redox flow batteries (VRFBs) na-amachi ojiji ha zuru ebe niile.A ghaghị imeziwanye kinetics nke mmeghachi omume electrochemical iji mee ka njupụta ike na ike ike nke VRFB dịkwuo elu, si otú ahụ belata kWh efu nke VRFB.N'ime ọrụ a, hydrothermally synthesized hydrated tungsten oxide (HWO) nanoparticles, C76 na C76 / HWO, na-edobere na carbon ákwà electrodes na-anwale dị ka electrocatalysts maka VO2 +/VO2+ redox mmeghachi omume.Igwe ihe nleba anya eletrọnịnụ (FESEM), ike na-ekesa X-ray spectroscopy (EDX), microscope elektrọn nnyefe dị elu (HR-TEM), diffraction X-ray (XRD), X-ray photoelectron spectroscopy (XPS), infrared Fourier. gbanwee Spectroscopy (FTIR) na nha akụkụ kọntaktị.Achọpụtara na mgbakwunye nke C76 fullerene na HWO nwere ike ịkwalite kinetics nke electrode n'ihe gbasara VO2 + / VO2 + mmeghachi omume redox site n'ịbawanye ihe omume na inye ndị ọrụ na-arụ ọrụ oxygen na-arụ ọrụ n'elu ya.Ihe mejupụtara HWO / C76 (50 wt% C76) gosipụtara na ọ kachasị mma maka mmeghachi omume VO2 +/VO2 + na ΔEp nke 176 mV ma e jiri ya tụnyere 365 mV maka akwa carbon na-adịghị edozi (UCC).Na mgbakwunye, ihe mejupụtara HWO/C76 gosipụtara mgbochi dị ịrịba ama nke mmeghachi omume evolushọn parasitic chlorine n'ihi otu ọrụ W-OH.
Ọrụ siri ike nke ụmụ mmadụ na mgbanwe mgbanwe ngwa ngwa nke ụlọ ọrụ ebutela nnukwu ọkụ eletrik na-enweghị nkwụsị, nke na-eto eto na ihe dịka 3% kwa afọ1.Ruo ọtụtụ iri afọ, iji mmanụ ọkụ eme ihe n'ọtụtụ ebe dị ka isi iyi ike emewo ka ikuku ikuku na-ekpo ọkụ , na-eduga na okpomoku zuru ụwa ọnụ, mmiri na mmetọ ikuku, na-eyi gburugburu ebe obibi niile egwu.N'ihi ya, n'afọ 2050, a na-atụ anya na òkè nke ike mmeghari ohuru na ike anyanwụ ga-eru 75% nke ọkụ eletrik.Otú ọ dị, mgbe mmepụta ume ọhụrụ karịrị 20% nke mmepụta ọkụ eletrik zuru ezu, grid na-aghọ ihe na-adịghị akwụsị akwụsị 1. Mmepe nke usoro nchekwa nchekwa ike dị mma dị oké mkpa maka mgbanwe a, n'ihi na ha ga-echekwa oke ọkụ eletrik na nguzozi ọkọnọ na ọchịchọ.
N'ime usoro nchekwa nchekwa niile dị ka ngwakọ vanadium redox na-agbaba batrị2, batrị niile vanadium redox (VRFBs) bụ ndị kachasị elu n'ihi ọtụtụ uru ha3 ma na-ewere ya dị ka ihe ngwọta kachasị mma maka nchekwa ike ogologo oge (~ afọ 30).Iji isi mmalite ume ọhụrụ4.Nke a bụ n'ihi nkewa nke ike na ike ike, nzaghachi ngwa ngwa, ogologo ndụ na ọnụ ala dị ala kwa afọ nke $ 65 / kWh ma e jiri ya tụnyere $ 93-140 / kWh maka batrị Li-ion na lead-acid na 279-420 USD / kWh./ kWh batrị n'otu n'otu 4.
Agbanyeghị, ọnụ ahịa isi ụlọ ọrụ dị oke elu na-egbochi azụmahịa ha zuru ebe niile, ọkachasị n'ihi ngwugwu batrị4,5.Ya mere, imeziwanye arụmọrụ batrị site n'ịbawanye kinetics nke mmeghachi omume abụọ nke ọkara cell nwere ike ibelata nha batrị ma si otú ahụ belata ọnụ ahịa.Ya mere, a na-achọfefe ngwa ngwa ngwa ngwa na elu electrode, dabere na nhazi, nhazi na nhazi nke electrode, nke a ghaghị iji nlezianya mee ka ọ dịkwuo mma.Ọ bụ ezie na electrodes dabeere na carbon nwere ezigbo kemịkalụ na electrochemical nkwụsi ike na ezigbo ọkụ eletrik, ọ bụrụ na a naghị agwọ ya, kinetics ha ga-adị ngwa ngwa n'ihi enweghị ọrụ oxygen na hydrophilicity7,8.Ya mere, a na-ejikọta electrocatalyst dị iche iche na carbon electrodes, karịsịa carbon nanostructures na metal oxides, iji meziwanye kinetics nke abụọ electrodes, si otú ahụ na-amụba kinetics nke VRFB electrodes.
A na-eji ọtụtụ ihe carbon, dị ka carbon paper9, carbon nanotubes10,11,12,13, graphene dabeere nanostructures14,15,16,17, carbon nanofibers18 na ndị ọzọ19,20,21,22,23, ma e wezụga maka ezinụlọ fullerene. .N'ime ọmụmụ ihe anyị gara aga na C76, anyị kọrọ maka oge mbụ ọrụ electrocatalytic dị mma nke Fullerene a n'ebe VO2 +/VO2 +, ma e jiri ya tụnyere uwe carbon a na-ekpo ọkụ na nke a na-adịghị edozi, nkwụsị nnyefe ụgwọ na-ebelata site na 99.5% na 97% 24.Arụ ọrụ catalytic nke ihe carbon maka mmeghachi omume VO2 +/VO2 + ma e jiri ya tụnyere C76 ka egosiri na tebụl S1.N'aka nke ọzọ, a na-eji ọtụtụ oxides metal dị ka CeO225, ZrO226, MoO327, NiO28, SnO229, Cr2O330 na WO331, 32, 33, 34, 35, 36, 37, 38 n'ihi ụbara wettability na ikuku oxygen.otu.Tebụlụ S2 na-egosi arụmọrụ catalytic nke ígwè oxides ndị a na mmeghachi omume VO2+/VO2+.A na-eji WO3 mee ihe na ọnụ ọgụgụ dị ịrịba ama nke ọrụ n'ihi ọnụ ala ya, nkwụsi ike dị elu na mgbasa ozi acidic, na ọrụ catalytic dị elu31,32,33,34,35,36,37,38.Otú ọ dị, WO3 gosipụtara ntakịrị ọganihu na cathode kinetics.Iji melite conductivity nke WO3, a nwalere mmetụta nke iji tungsten oxide belatara (W18O49) na nti electrode ọrụ a nwalere38.A nwalebeghị hydrated tungsten oxide (HWO) na ngwa VRFB, n'agbanyeghị na ọ gosipụtara ọrụ dị elu na ngwa supercapacitor n'ihi mgbasa ozi ngwa ngwa ma e jiri ya tụnyere WOx39,40 anhydrous.Ọgbọ nke atọ All-vanadium redox flow batrị na-eji ngwakọta acid electrolyte mejupụtara HCl na H2SO4 iji melite arụmọrụ batrị ma melite solubility na nkwụsi ike nke ions vanadium na electrolyte.Otú ọ dị, mmeghachi omume evolushọn parasitic chlorine aghọwo otu n'ime adịghị ike nke ọgbọ nke atọ, ya mere ịchọta ụzọ isi kwụsị mmeghachi omume nyocha chlorine aghọwo ọrụ nke ọtụtụ ndị nyocha.
N'ebe a, a na-eme nyocha mmeghachi omume VO2 + / VO2 + na HWO / C76 composites na-etinye na carbon carbon electrodes iji chọpụta nguzozi n'etiti eletriki eletrik nke ihe mgbagwoju anya na redox mmeghachi omume kinetics na elu electrode mgbe ọ na-egbochi ntinye chlorine parasitic.mmeghachi omume (KVR).A na-emepụta nanoparticles hydrated tungsten oxide (HWO) site na usoro hydrothermal dị mfe.Emere nnwale na ngwakọta acid electrolyte (H2SO4/HCl) iji mee ka ọgbọ nke atọ VRFB (G3) dị mma na iji nyochaa mmetụta HWO na mmeghachi omume evolushọn chlorine parasitic42.
Vanadium (IV) sulfate oxide hydrate (VOSO4, 99.9%, Alfa-Aeser), sulfuric acid (H2SO4), hydrochloric acid (HCl), dimethylformamide (DMF, Sigma-Aldrich), polyvinylidene fluoride (PVDF, Sigma-Aldrich), sodium), Tungsten oxide dihydrate (Na2WO4, 99%, Sigma-Aldrich) na akwa carbon hydrophilic ELAT (Fuel Cell Store) ka ejiri mee ihe n'ọmụmụ ihe a.
A na-akwadebe hydrated tungsten oxide (HWO) site na mmeghachi omume hydrothermal nke 2 g nke nnu Na2WO4 na-agbaze na 12 ml nke HO ruo mgbe a na-enweta ihe ngwọta na-enweghị agba, wee tinye 12 ml nke 2 M HCl na-agbada ruo mgbe nkwụsịtụ odo odo. nwetara.nkwusioru.Emere mmeghachi omume hydrothermal na Teflon mkpuchi igwe anaghị agba nchara autoclave n'ime oven na 180 ºC maka awa 3.A na-anakọta ihe fọdụrụ site na nzacha, saa 3 ugboro na ethanol na mmiri, a mịrị amị na oven na 70 ° C maka ~ 3 h, wee gbadaa iji nweta ntụ ntụ HWO na-acha anụnụ anụnụ.
The nwetara (na-adịghị agwọ ọrịa) carbon ákwà electrodes (CCTs) e ji n'ụdị nke ha nwetara ma ọ bụ doro okpomọkụ ọgwụgwọ na a tube ọkụ na 450 Celsius C maka 10 h na okpomọkụ nke 15 ° C / min na ikuku. nweta mesoo UCC (TCC), s Otu dị ka aga ọrụ 24. UCC na TCC e bee n'ime electrodes odika 1.5 cm n'obosara na 7 cm ogologo.A kwadoro nkwusioru nke C76, HWO, HWO-10% C76, HWO-30% C76 na HWO-50% C76 site na ịgbakwunye 20 mg nke ntụ ntụ na-arụ ọrụ na 10 wt% (~ 2.22 mg) nke PVDF binder to ~ 1 ml. DMF akwadoro na sonicated maka 1 hour iji melite otu.Mgbe ahụ, etinyere 2 mg nke C76, HWO na HWO-C76 composites na ihe dịka 1.5 cm2 nke UCC na-arụ ọrụ electrode mpaghara.A na-etinye ihe niile na-eme ka ọ bụrụ ihe na-eme ka ọ dị na UCC electrodes ma jiri TCC mee ihe maka ntụnyere naanị, dịka ọrụ anyị gara aga gosiri na ọgwụgwọ okpomọkụ adịghị achọ 24 .Emetara ndozigharị echiche site na ịsachapụ 100 µl nke nkwusioru (ibu 2 mg) maka ịdị n'otu ka ukwuu.Mgbe ahụ, a na-akpọnwụ electrodes niile n'ime oven n'abali na 60 Celsius.A na-atụ electrodes tupu na mgbe emechara iji hụ na ebubata ngwaahịa ziri ezi.Iji nwee mpaghara geometric (~ 1.5 cm2) ma gbochie ịrị elu nke vanadium electrolyte na electrodes n'ihi mmetụta nke capillary, a na-etinye obere paraffin n'elu ihe na-arụ ọrụ.
A na-eji microscope eletrọn na-enyocha ihe ọkụkụ (FESEM, Zeiss SEM Ultra 60.5 kV) iji hụ ụdị ọdịdị elu HWO.A na-eji ihe nleba anya X-ray dispersive ike nke nwere Feii8SEM (EDX, Zeiss AG) mee ka eserese HWO-50% C76 dị na electrodes UCC.A na-eji microscope elektrọn nnyefe dị elu (HR-TEM, JOEL JEM-2100) na-arụ ọrụ na voltaji na-agba ọsọ nke 200 kV iji nweta ihe oyiyi mkpebi dị elu na mgbanaka mgbanaka nke akụkụ HWO.Jiri ngwa Crystallographic Tool Box (CrysTBox) nyochaa mgbanaka mgbanaka HWO site na iji ọrụ ringGUI wee jiri nsonaazụ ya tụnyere ụdị XRD.A na-ekpebi nhazi na graphitization nke UCC na TCC site na X-ray diffraction (XRD) na nyocha nyocha nke 2.4 ° / min site na 5 ° ruo 70 ° na Cu Kα (λ = 1.54060 Å) na-eji panalytical X-ray diffractometer.(Nlereanya 3600).XRD na-egosi nhazi kristal na akụkụ nke HWO.Ejiri ngwanro PANalytical X'Pert HighScore dabara na elu HWO na maapụ tungsten oxide dị na nchekwa data45.Tulee nsonaazụ HWO na nsonaazụ TEM.Ihe mejupụtara kemịkalụ na ọnọdụ ihe nlele HWO bụ nke X-ray photoelectron spectroscopy kpebisiri ike (XPS, ESCALAB 250Xi, ThermoScientific).Ejiri sọftụwia CASA-XPS (v 2.3.15) mee ihe maka ntọhapụ kacha elu na nyocha data.Fourier transform infrared spectroscopy (FTIR, na-eji Perkin Elmer klas KBr FTIR spectrometer) nha ka emere iji chọpụta otu ọrụ elu nke HWO na HWO-50%C76.Tulee nsonaazụ ya na nsonaazụ XPS.A na-ejikwa nha nkuku kọntaktị (KRUSS DSA25) iji mara ịdị nro nke electrodes.
Maka nha electrochemical niile, ejiri Biologic SP 300 rụọ ọrụ.A na-eji Cyclic voltammetry (CV) na electrochemical impedance spectroscopy (EIS) amụ electrode kinetics nke mmeghachi omume redox VO2+/VO2+ na mmetụta nke reagent mgbasa (VOSO4 (VO2+)) na ọnụego mmeghachi omume.Teknụzụ abụọ a na-eji cell-electrode cell atọ nwere mkpokọta electrolyte nke 0.1 M VOSO4 (V4+) gbazere na 1 M H2SO4 + 1 M HCl (agwakọta acid).A na-edozi data electrochemical niile IR.A na-eji igwe eletrọd calomel juru eju (SCE) na eriri platinum (Pt) dị ka ihe nrụtụ aka na igwe eletrọd, n'otu n'otu.Maka CV, a na-etinye ọnụ ọgụgụ nyocha (ν) nke 5, 20, na 50 mV / s na windo nwere ike (0-1) V ma e jiri ya tụnyere SCE maka VO2 +/VO2 +, wee mezie ya na nha SHE iji kpaa nkata (VSCE = 0.242). V metụtara HSE).Iji nyochaa njide nke ọrụ electrode, a na-emegharị CV na UCC, TCC, UCC-C76, UCC-HWO na UCC-HWO-50% C76 na ν hà nhata 5 mV/s.Maka nha EIS maka mmeghachi omume redox VO2+/VO2+, a na-eji ọnụọgụ ugboro nke 0.01-105 Hz na ọgba aghara sekit sekit (OCV) nke 10 mV.Emegharịrị nnwale ọ bụla ugboro 2-3 iji hụ na nkwekọ nke nsonaazụ ya.Ejiri usoro Nicholson nweta ọnụọgụ dị iche iche (k0) 46,47.
Achịkọtala hydrated tungsten oxide (HVO) nke ọma site na usoro hydrothermal.Foto SEM na fig.1a na-egosi na HWO echekwabara nwere ụyọkọ nke nanoparticles nwere nha nha na oke nke 25-50 nm.
Usoro mgbasa ozi X-ray nke HWO na-egosi ọnụ ọgụgụ kasị elu (001) na (002) na ~ 23.5 ° na ~ 47.5 °, n'otu n'otu, nke bụ njirimara nke nonstoichiometric WO2.63 (W32O84) (PDF 077-0810, a = 21.4 Å, b = 17.8 Å, c = 3.8 Å, α = β = γ = 90 °), nke kwekọrọ na agba anụnụ anụnụ pụtara ìhè (Fig 1b) 48,49.Ọnụ ugwu ndị ọzọ na ihe dịka 20.5°, 27.1°, 28.1°, 30.8°, 35.7°, 36.7° na 52.7° dị na (140), (620), (350), (720), (740), (560).na (970) ụgbọ elu diffraction, n'otu n'otu, 49 orthorhombic WO2.63.Songara et al.43 jiri otu usoro sịntetị ahụ mee ihe iji nweta ngwaahịa ọcha, nke a na-ekwu na ọnụnọ WO3 (H2O) 0.333.Otú ọ dị, na ọrụ a, n'ihi ọnọdụ dị iche iche, e nwetara ngwaahịa na-acha anụnụ anụnụ, na-egosi ịdị n'otu nke WO3 (H2O) 0.333 (PDF 087-1203, a = 7.3 Å, b = 12.5 Å, c = 7.7) na Å. , α = β = γ = 90 °) na mbelata ụdị tungsten oxide.Nyocha nke ọkara na ngwanrọ X'Pert HighScore gosipụtara 26% WO3 (H2O) 0.333: 74% W32O84.Ebe W32O84 nwere W6+ na W4+ (1.67:1 W6+:W4+), ihe ekwuru na ọdịnaya W6+ na W4+ bụ ihe dịka 72% W6+ na 28% W4+, n'otu n'otu.Ihe onyonyo SEM, 1-sekọnd XPS spectra na ọkwa nucleus, onyonyo TEM, FTIR spectra na Raman spectra nke ihe C76 ka ewepụtara na akwụkwọ anyị gara aga24.Dị ka Kawada et al.50,51 si kwuo, X-ray diffraction pattern of C76 na-egosi usoro monoclinic nke FCC mgbe e wepụsịrị toluene.
Foto SEM dị na fig.2a na b na-egosi ntinye ihe ịga nke ọma nke HWO na HWO-50% C76 na na n'etiti eriri carbon nke UCC electrodes.E gosipụtara eserese nke tungsten, carbon na oxygen na foto SEM na Fig. 2c na fig.2d-f na-egosi na tungsten na carbon na-ejikọta ya n'otu n'otu (na-egosi nkesa yiri ya) n'elu electrode elu na ihe mejupụtara anaghị echekwa ya nke ọma.n'ihi ọdịdị nke usoro mmiri ozuzo.
Ihe onyonyo SEM nke irighiri ihe HWO (a) na HWO-C76 (b).Maapụ EDX ebugoro na HWO-C76 na UCC site na iji mpaghara dị na onyonyo (c) na-egosi nkesa tungsten (d), carbon (e), na oxygen (f) na nlele.
A na-eji HR-TEM mee ihe maka nleba anya dị elu na ozi crystallographic (Nyocha 3).HWO na-egosiputa nanocube morphology dị ka egosiri na Figure 3a na nke ọma na Figure 3b.Site n'ịkwalite nanocube maka ntụgharị nke mpaghara ahọpụtara, enwere ike ịhụ usoro grating na ụgbọ elu dị iche iche na-eju iwu Bragg dị ka egosiri na eserese 3c, na-akwado kristal nke ihe ahụ.Na ntinye na Fig. 3c na-egosi anya d 3.3 Å kwekọrọ na (022) na (620) ụgbọ elu diffraction na WO3 (H2O) 0.333 na W32O84, 43, 44, 49 usoro, n'otu n'otu.Nke a dabara na nyocha XRD dị n'elu (Fig 1b) ebe ọ bụ na anya ụgbọ elu grating a na-ahụ anya d (Fig 3c) kwekọrọ na ọnụ ọgụgụ XRD kachasị ike na nlele HWO.A na-egosikwa mgbanaka ihe atụ na fig.3d, ebe mgbanaka ọ bụla dabara na ụgbọ elu dị iche.Ụgbọ elu WO3 (H2O) 0.333 na W32O84 na-acha ọcha na-acha anụnụ anụnụ, n'otu n'otu, na ọnụ ọgụgụ XRD ha kwekọrọ na-egosikwa na Fig. 1b.Mgbanaka mbụ egosiri n'ụkpụrụ mgbanaka dabara na ọnụ ọgụgụ mbụ akara na ụkpụrụ x-ray nke (022) ma ọ bụ (620) ụgbọ elu diffraction.Site na (022) ruo (402) yiri mgbanaka, d-anya nke 3.30, 3.17, 2.38, 1.93, na 1.69 Å, nke kwekọrọ na ụkpụrụ XRD nke 3.30, 3.17, 2.45, 1.93 na 1.66.Å, 44, 45, otu.
(a) Onyonyo HR-TEM nke HWO, (b) na-egosi onyonyo abawanyela.A na-egosi foto nke ụgbọ elu grating na (c), na ntinye (c) na-egosi nnukwu ihe oyiyi nke ụgbọ elu na etiti d 0.33 nm kwekọrọ na (002) na (620).(d) ụkpụrụ mgbanaka HWO na-egosi ụgbọ elu jikọtara ya na usoro WO3 (H2O) 0.333 (ọcha) na W32O84 (acha anụnụ anụnụ).
Emere nyocha XPS iji chọpụta kemịkalụ elu na ọnọdụ oxidation nke tungsten (Figure S1 na 4).A na-egosi ụdịdị dị iche iche nke nyocha XPS obosara nke HWO synthesized na fig.S1, na-egosi ọnụnọ tungsten.A na-egosi ụdị nyocha dị warara XPS nke ọkwa W 4f na O 1s na fig.4a na b, n'otu n'otu.The W 4f ụdịdị dị iche iche na-ekewa abụọ spin-orbit doublets kwekọrọ na ike njikọ nke steeti oxidation W. Ọnụ ọgụgụ kasị elu W 4f5/2 na W 4f7/2 na njigide ike nke 37.8 na 35.6 eV bụ nke W6+, na ọnụ ọgụgụ kasị elu W. 4f5/2 na W 4f7/2 na 36.6 na 34.9 eV bụ njirimara nke steeti W4+, n'otu n'otu.Ọnụnọ nke steeti oxidation (W4 +) na-akwadokwa nhazi nke WO2.63 na-abụghị stoichiometric, ebe ọnụnọ W6 + na-egosi stoichiometric WO3 n'ihi WO3 (H2O) 0.333.Ihe data dabara adaba gosiri na pasentị atọm nke W6+ na W4+ bụ 85% na 15%, n'otu n'otu, bụ nke dị nso na ụkpụrụ ndị echere na data XRD, nyere ọdịiche dị n'etiti teknụzụ abụọ ahụ.Ụzọ abụọ a na-enye ozi ọnụọgụ na izi ezi dị ala, ọkachasị XRD.Na mgbakwunye, ụzọ abụọ ahụ na-enyocha akụkụ dị iche iche nke ihe ahụ n'ihi na XRD bụ usoro buru ibu ebe XPS bụ usoro elu nke na-abịaru nso nanometer ole na ole.Ụdịdị dị iche iche nke O 1s na-ekewa ụzọ abụọ na 533 (22.2%) na 530.4 eV (77.8%).Nke mbụ kwekọrọ na OH, na nke abụọ na njikọ oxygen na lattice na WO.Ọnụnọ nke otu ndị na-arụ ọrụ OH kwekọrọ na njirimara hydration nke HWO.
A na-emekwa nyocha FTIR na ihe atụ abụọ a iji nyochaa ọnụnọ nke otu ndị na-arụ ọrụ na ngwongwo mmiri a na-ahazi na nhazi HWO hydrated.Nsonaazụ na-egosi na HWO-50% C76 sample na FT-IR HWO na-ele anya otu ihe ahụ n'ihi ọnụnọ nke HWO, ma ike nke elu dị iche iche dị iche iche n'ihi ụdị dị iche iche nke ihe nlele ejiri n'oge nkwadebe maka nyocha (Fig 5a). ).HWO-50% C76 All fullerene 24 elu ka egosiri ma e wezụga maka tungsten oxide elu.Zuru ezu na fig.5a na-egosi na ihe atụ abụọ ahụ na-egosipụta nnukwu bandwit dị ukwuu na ~ 710 / cm, nke a na-akpọ OWO na-agbatị vibrations na nhazi HWO lattice, na ubu siri ike na ~ 840 / cm, nke a na-akpọ WO.ọkpọkọ dị nkọ na ~ 1610 / cm metụtara ụda na-agbagọ nke OH, yana eriri absorption sara mbara na ~ 3400 / cm metụtara mgbatị na-agbatị OH na hydroxyl group43.Nsonaazụ ndị a kwekọrọ na ụdị XPS dị na Fig. 4b, ebe otu ọrụ WO nwere ike inye saịtị na-arụ ọrụ maka mmeghachi omume VO2 +/VO2 +.
Nyocha FTIR nke HWO na HWO-50% C76 (a) na-egosi otu ọrụ na nha kọntaktị (b, c).
Otu OH nwekwara ike ime ka mmeghachi omume VO2 +/VO2+ dịkwuo elu, si otú ahụ na-abawanye hydrophilicity nke electrode, si otú ahụ na-akwalite mgbasa na ọnụego nnyefe electron.HWO-50% C76 sample na-egosi ihe ọzọ C76 ọnụ ọgụgụ dị ka e gosiri na ọnụ ọgụgụ.Enwere ike ekenye ọnụ ọgụgụ kachasị elu na ~ 2905, 2375, 1705, 1607, na 1445 cm3 na CH, O = C = O, C = O, C = C, na CO na-agbatị vibrations, n'otu n'otu.A maara nke ọma na ndị ọrụ oxygen C = O na CO nwere ike ije ozi dị ka ebe na-arụ ọrụ maka mmeghachi omume redox nke vanadium.Iji nwalee ma tụnyere wettability nke electrodes abụọ ahụ, a na-eji nha ihu kọntaktị dị ka e gosiri na Fig. 5b, c.HWO electrode ozugbo na-amịkọrọ mmiri mmiri, na-egosi superhydrophilicity n'ihi otu ọrụ OH dị.HWO-50% C76 bụ hydrophobic karịa, yana akụkụ kọntaktị nke ihe dịka 135 ° mgbe 10 sekọnd.Otú ọ dị, na nha electrochemical, a na-agbanye ọkụ eletrik HWO-50% C76 kpamkpam n'ime ihe na-erughị otu nkeji.Ihe nha wettability kwekọrọ na nsonaazụ XPS na FTIR, na-atụ aro na ọtụtụ OH dị n'elu HWO na-eme ka ọ dịkwuo ntakịrị hydrophilic.
A nwalere mmeghachi omume VO2 + / VO2 + nke HWO na HWO-C76 nanocomposites na a na-atụ anya na HWO ga-egbochi evolushọn nke gas chlorine nke na-eme n'oge mmeghachi omume VO2 + / VO2 + na acid agwakọtara, ebe C76 ga-eme ka VO2 +/ VO2+ chọrọ.A na-etinye nkwusioru HWO nwere 10%, 30% na 50% C76 na electrodes UCC na mkpokọta ihe dị ka 2 mg/cm2.
Dị ka e gosiri na fig.6, a na-enyocha kinetics nke mmeghachi omume VO2 +/VO2+ na elu electrode site na iji CV na electrolytes agwakọta acidic.E gosipụtara ugbu a dị ka I/Ipa iji kwado ntụnyere ΔEp na Ipa/Ipc.A na-enweta ihe dị iche iche na-akpali akpali ozugbo site na ọnụ ọgụgụ ahụ.Egosiri data nkeji mpaghara ugbu a na eserese 2S.Na fig.Onyonyo 6a na-egosi na HWO dị ntakịrị na-abawanye ọnụego mbufe elektrọn nke mmeghachi omume redox VO2 +/VO2+ na elu electrode ma na-egbochi mmeghachi omume evolushọn parasitic chlorine.Agbanyeghị, C76 na-abawanye ọnụego mbufe eletrọn nke ukwuu ma na-akpali mmeghachi omume evolushọn chlorine.Ya mere, ihe mgbagwoju anya nke nwere nhazi ziri ezi nke HWO na C76 kwesịrị inwe ọrụ kachasị mma na ikike kachasị elu iji gbochie mmeghachi omume chlorine.Achọpụtara na mgbe ọ gbasasịrị ọdịnaya C76, ọrụ electrochemical nke electrode na-eme ka ọ dịkwuo mma, dị ka egosipụtara site na mbelata nke ΔEp na mmụba nke Ipa / Ipc ratio (Table S3).E gosikwara nke a site na ụkpụrụ RCT ewepụtara na atụmatụ Nyquist na Fig. 6d (tebụl S3), ebe achọpụtara na ụkpụrụ RCT belatara na ụba ọdịnaya nke C76.Nsonaazụ ndị a kwekọrọ na ọmụmụ Lee nke mgbakwunye nke carbon mesoporous na mesoporous WO3 kwalitere ụgwọ mbufe kinetics na VO2+/VO2+35.Nke a na-egosi na mmeghachi omume dị mma nwere ike ịdabere karịa na conductivity nke electrode (C = C bond) 18,24,35,36,37.N'ihi mgbanwe nke geometry nhazi n'etiti [VO (H2O) 5] 2+ na [VO2 (H2O) 4]+, C76 nwekwara ike ibelata nzaghachi nzaghachi site na ibelata ume anụ ahụ.Otú ọ dị, nke a nwere ike ọ gaghị ekwe omume na HWO electrodes.
(a) Cyclic voltammetric omume nke UCC na HWO-C76 composites nwere dị iche iche HWO: C76 ratios na VO2 +/VO2+ mmeghachi omume na 0.1 M VOSO4/1 M H2SO4 + 1 M HCl electrolyte (na ν = 5 mV / s).(b) Randles-Sevchik na (c) Usoro Nicholson's VO2 +/VO2+ maka ịkọpụta nrụpụta mgbasa ozi na ịnweta ụkpụrụ k0 (d).
Ọ bụghị naanị na HWO-50% C76 na-egosipụta ihe fọrọ nke nta ka ọ bụrụ otu ọrụ electrocatalytic dị ka C76 maka mmeghachi omume VO2 +/VO2 +, mana, nke na-adọrọ mmasị karị, ọ gbakwunyere na-egbochi mgbanwe nke gas chlorine ma e jiri ya tụnyere C76, dị ka egosiri na ọnụ ọgụgụ ahụ.6a, na mgbakwunye na igosi obere okirikiri dị na fig.6g (RCT dị ala).C76 gosipụtara Ipa / Ipc dị elu karịa HWO-50% C76 (Table S3), ọ bụghị n'ihi mmeghachi omume mmeghachi omume dị mma, ma n'ihi na ọ na-ejikọta ya na oke mbelata chlorine na 1.2 V ma e jiri ya tụnyere SHE.Arụ ọrụ kacha mma nke HWO-50% C76 sitere na mmekọrịta dị n'etiti C76 na-eme ihe na-adịghị mma na oke wettability na catalytic functionalities nke W-OH na HWO.Ọ bụ ezie na obere ikuku chlorine ga-eme ka arụmọrụ chaja nke cell zuru ezu dịkwuo mma, kinetics emelitere ga-abawanye arụmọrụ nke voltaji cell zuru ezu.
Dabere na nha nha S1, maka mgbanwe mgbanwe nke quasi-reversible (nfefe elektrọn dị nwayọ) na-achịkwa mgbasa ozi, ọnụ ọgụgụ kacha elu (IP) dabere na ọnụọgụ elektrọn (n), mpaghara electrode (A), ọnụọgụ mgbasa (D), ọnụọgụ. nke ọnụọgụ mbufe elektrọn (α) na ọsọ nyocha (ν).Iji mụọ omume a na-achịkwa mgbasa ozi nke ihe ndị a nwalere, e debere mmekọrịta dị n'etiti IP na ν1 / 2 ma gosipụta ya na Fig. 6b.Ebe ọ bụ na ihe niile na-egosi njikọ dị n'ahịrị, a na-achịkwa mmeghachi omume site na mgbasa.Ebe ọ bụ na mmeghachi omume VO2 +/VO2 + bụ ihe na-agbanwe agbanwe, mkpọda nke ahịrị na-adabere na ọnụọgụ mgbasa ozi na uru nke α (nha nhata S1).N'ihi ọnụọgụ mgbasa ozi mgbe niile (≈ 4 × 10-6 cm2 / s) 52, ọdịiche dị na mkpọda ahịrị na-egosi kpọmkwem ụkpụrụ dị iche iche nke α na ya mere ọnụego dị iche iche nke nnyefe eletrọn na elu electrode, yana C76 na HWO -50. % C76, na-egosipụta mkpọda ugwu kacha elu (ọnụego mbufe eletrọn kacha elu).
Mkpọda Warburg dị ala gbakọọ (W) nke egosiri na Tebụl S3 (Fig 6d) nwere ụkpụrụ dị nso na 1 maka ihe niile, na-egosi mgbasa ozi zuru oke nke irighiri ihe redox ma na-akwado omume linear nke IP na ν1 / 2 maka CV.nha .Maka HWO-50% C76, mkpọda Warburg na-esi n'ịdị n'otu gaa na 1.32, na-atụ aro onyinye ọ bụghị naanị site na mgbasa ozi na-enweghị ngwụcha nke reactants (VO2 +), kamakwa ọ nwere ike bụrụ omume dị nro na omume mgbasa n'ihi porosity electrode.
Iji nyochaa ngbanwe nke mgbanwe (ọnụego mbufe elektrọn) nke mmeghachi omume redox VO2 +/VO2+, a na-ejikwa usoro mmeghachi omume nke Nicholson quasi-reversible iji chọpụta ọnụego ọkọlọtọ mgbe niile k041.42.A na-eme nke a site n'ịkpa nkata paramita kinetic na-enweghị akụkụ Ψ dị ka ọrụ nke ΔEp dị ka ọrụ nke ν-1/2 na-eji nha S2.Tebụlụ S4 na-egosi ụkpụrụ Ψ ga-arụpụta maka ihe elektrọd ọ bụla.Tụgharịa rịzọlt (Onyonyo 6c) iji nweta k0 × 104 cm/s (edere ya n'akụkụ ahịrị ọ bụla wee gosipụta ya na Tebụlụ S4) site na iji nhata S3 maka mkpọda nke nkata ọ bụla.HWO-50% C76 hụrụ na ọ nwere mkpọda kachasị elu (Fig 6c) ya mere k0 kachasị elu nke 2.47 × 10-4 cm / s.Nke a pụtara na electrode a na-enye kinetics kacha ngwa ngwa kwekọrọ na nsonaazụ CV na EIS na ọnụọgụ 6a na d na tebụl S3.Na mgbakwunye, a na-enwetakwa ụkpụrụ k0 site na atụmatụ Nyquist (Fig 6d) nke Equation S4 site na iji ụkpụrụ RCT (Table S3).A na-achịkọta nsonaazụ k0 ndị a sitere na EIS na tebụl S4 ma gosipụtakwa na HWO-50% C76 na-egosipụta ọnụego mbufe elektrọn kachasị elu n'ihi mmetụta synergistic.Ọ bụ ezie na uru nke k0 dị iche n'ihi mmalite dị iche iche nke usoro ọ bụla, ọ ka na-egosi otu usoro nke ịdị ukwuu ma na-egosi nkwụsịtụ.
Iji ghọta nke ọma kinetics dị mma nke enwere ike nweta, ọ dị mkpa iji ihe electrode kachasị mma tụnyere UCC na TCC electrodes na-enweghị mkpuchi.Maka mmeghachi omume VO2 +/VO2 +, HWO-C76 ọ bụghị naanị gosipụtara ΔEp kachasị dị ala na ngbanwe ka mma, ma na-egbochikwa mmeghachi omume evolushọn parasitic parasitic chlorine ma e jiri ya tụnyere TCC, dị ka egosipụtara site na nnukwu ọdịda dị ugbu a na 1.45 V ma e jiri ya tụnyere ịhụ OHA (Fig. 7a).N'ihe gbasara nkwụsi ike, anyị chere na HWO-50% C76 kwụsiri ike n'ụzọ anụ ahụ n'ihi na a na-agwakọta onye na-eme ihe na ihe nkedo PVDF wee tinye ya na electrodes akwa carbon.E jiri ya tụnyere 50 mV maka UCC, HWO-50% C76 gosipụtara ngbanwe kachasị elu nke 44 mV mgbe usoro 150 gasịrị (ọnụego mmebi 0.29 mV / okirikiri) (Nyocha 7b).O nwere ike ọ gaghị abụ nnukwu ihe dị iche, mana kinetics nke UCC electrodes na-adị ngwa ngwa ma na-eweda ịgba ígwè, karịsịa maka mmeghachi omume azụ.Ọ bụ ezie na ngbanwe nke TCC dị nnọọ mma karịa nke UCC, a chọpụtara na TCC nwere nnukwu ngbanwe nke 73 mV mgbe usoro 150 gasịrị, nke nwere ike ịbụ n'ihi nnukwu chlorine a na-esi na ya pụta.Iji hụ na onye na-eme ihe na-akwado nke ọma na elu electrode.Dị ka a na-ahụ na electrodes niile a nwalere, ọbụna ndị na-enweghị ihe nkwado na-egosi ọkwa dịgasị iche iche nke enweghị ike ịgba ígwè, na-atụ aro na mgbanwe nke oke elu n'oge ịgba ígwè bụ n'ihi nkwụsị ihe onwunwe n'ihi mgbanwe kemịkalụ kama ịkewa nkewa.Ọzọkwa, ọ bụrụ na a ga-ekewapụ ihe dị ukwuu nke ihe na-emepụta ihe site na electrode elu, nke a ga-eduga na mmụba dị ukwuu na nkewa kachasị elu (ọ bụghị naanị site na 44 mV), ebe ọ bụ na mkpụrụ (UCC) adịghị arụ ọrụ maka VO2 +/VO2+ mmeghachi omume redox.
Ntụle nke CV (a) na nkwụsi ike nke mmeghachi omume redox VO2 +/VO2+ (b) nke ihe kacha mma electrode gbasara CCC.Na electrolyte 0.1 M VOSO4/1 M H2SO4 + 1 M HCl, CV niile hà nhata ν = 5 mV / s.
Iji mee ka mma akụ na ụba nke teknụzụ VRFB dịkwuo mma, imeziwanye na ịghọta kinetics nke vanadium redox mmeghachi omume dị oké mkpa iji nweta ike dị elu.A kwadebere ihe ndị mejupụtara HWO-C76 na mmetụta electrocatalytic ha na mmeghachi omume VO2 + / VO2 +.HWO gosipụtara ntakịrị nkwalite kinetic mana ọ kwụsịrị chlorine evolushọn na electrolytes agwakọta acidic.A na-eji oke dị iche iche nke HWO:C76 mee ka ọ dịkwuo elu kanetics nke electrodes dabeere na HWO.Ịba ụba ọdịnaya nke C76 na HWO nwere ike imeziwanye kinetics electron transfer kinetics nke VO2 +/VO2 + mmeghachi omume na electrode gbanwetụrụ, n'ime nke HWO-50% C76 bụ ihe kasị mma n'ihi na ọ na-ebelata ikike nnyefe nnyefe ma na-ebelata chlorine gas evolushọn ma e jiri ya tụnyere ya. C76.na TCC ka ewepụtara.Nke a bụ n'ihi mmetụta synergistic dị n'etiti C = C sp2 hybridization, OH na W-OH na-arụ ọrụ.Achọpụtara ọnụego mmebi nke HWO-50% C76 ka ọ bụrụ 0.29mV / okirikiri n'okpuru ọtụtụ ịgba ígwè ebe UCC na TCC bụ 0.33mV / okirikiri na 0.49mV / okirikiri, na-eme ka ọ kwụsie ike na electrolytes agwakọta acid.Nsonaazụ ewepụtara nke ọma na-achọpụta ihe elektrọd arụmọrụ dị elu maka mmeghachi omume VO2 +/VO2+ na kinetics ngwa ngwa yana nkwụsi ike dị elu.Nke a ga-amụba voltaji mmepụta, si otú ahụ na-emeziwanye ike ike nke VRFB, si otú ahụ na-ebelata ego nke ịzụ ahịa n'ọdịnihu.
Ihe ndekọ data ejiri na/ma ọ bụ nyochaa n'ime ọmụmụ ihe ugbu a dị site n'aka ndị edemede dị iche iche na arịrịọ ezi uche dị na ya.
Luderer G. et al.Na-eme atụmatụ ikuku na ike anyanwụ n'ime ọnọdụ ike ikuku carbon dị ala: Okwu mmalite.Energy Economics.64, 542–551 .https://doi.org/10.1016/j.eneco.2017.03.027 (2017).
Lee, HJ, Park, S. na Kim, H. Nyochaa mmetụta nke ntinye MnO2 na arụmọrụ nke vanadium manganese redox eruba batrị.J. Electrochemistry.ọha mmadụ.165 (5), A952-A956.https://doi.org/10.1149/2.0881805jes (2018).
Shah, AA, Tangirala, R., Singh, R., Wills, RGA na Walsh, FK Dynamic unit cell model maka ihe niile-vanadium redox eruba batrị.J. Electrochemistry.ọha mmadụ.158 (6), A671.https://doi.org/10.1149/1.3561426 (2011).
Gandomi, YA, Aaron, DS, Zawodzinski, TA, na Mench, MM Nleta nkesa nwere ike ịdị n'ime ọnọdụ yana ụdị nkwenye maka batrị na-agbapụta vanadium redox niile.J. Electrochemistry.ọha mmadụ.163 (1), A5188-A5201.https://doi.org/10.1149/2.0211601jes (2016).
Tsushima, S. na Suzuki, T. Modeling na simulation nke a vanadium redox batrị na interdigitated flux ubi na-ebuli electrode Ọdịdị.J. Electrochemistry.ọha mmadụ.167 (2), 020553. https://doi.org/10.1149/1945-7111/ab6dd0 (2020).
Sun, B. na Skillas-Kazakos, M. Mgbanwe nke Graphite Electrode Materials for Application in Vanadium Redox Battery - I. Ọgwụgwọ okpomọkụ.electrochemistry.Ọrụ 37 (7), 1253–1260.https://doi.org/10.1016/0013-4686(92)85064-R (1992).
Liu, T., Li, S., Zhang, H., na Chen, J. Ọganihu nke electrode ihe iji melite ike njupụta na vanadium eruba batrị (VFBs).J. Energy Chemistry.27 (5), 1292–1303.https://doi.org/10.1016/j.jechem.2018.07.003 (2018).
Liu, QH et al.Igwe na-agbapụta vanadium redox dị elu nwere nhazi electrode kachasị na nhọrọ akpụkpọ ahụ.J. Electrochemistry.ọha mmadụ.159 (8), A1246-A1252.https://doi.org/10.1149/2.051208jes (2012).
Wei, G., Jia, K., Liu, J., na Yang, K. Composite carbon nanotube catalyst electrodes na carbon nwere mmetụta nkwado maka ngwa batrị vanadium redox.J. Ọkụ ọkụ.220, 185-192.https://doi.org/10.1016/j.jpowsour.2012.07.081 (2012).
Ọnwa, S., Kwon, BV, Chang, Y., na Kwon, Y. Mmetụta nke bismuth sulfate etinyere na CNT acidified na arụmọrụ nke vanadium redox eruba batrị.J. Electrochemistry.ọha mmadụ.166 (12), A2602.https://doi.org/10.1149/2.1181912jes (2019).
Huang, R.-H.chere.Eletrọd na-arụ ọrụ ejiri platinum/carbon nanotubes nwere mgbidi gbazitere maka batrị vanadium redox eruba.J. Electrochemistry.ọha mmadụ.159 (10), A1579.https://doi.org/10.1149/2.003210jes (2012).
Ma, S. et al.The vanadium redox flow batrị na-eji electrocatalysts mma na nitrogen-doped carbon nanotubes ewepụtara na organometallic scaffolds.J. Electrochemistry.ọha mmadụ.165(7), A1388.https://doi.org/10.1149/2.0621807jes (2018).
Khan, P. et al.Graphene oxide nanosheets dị ka ihe ndị na-arụ ọrụ nke ọma na-arụ ọrụ nke ọma maka VO2 +/ na V2 +/V3+ redox di na nwunye maka vanadium redox eruba batrị.Carbon 49 (2), 693–700.https://doi.org/10.1016/j.carbon.2010.10.022 (2011).
Gonzalez, Z. et al.Ọmarịcha arụmọrụ elektrọnik nke graphite-gbanwetụrụ graphite chere maka batrị vanadium redox.J. Ọkụ ọkụ.338, 155-162.https://doi.org/10.1016/j.jpowsour.2016.10.069 (2017).
González Z., Vizirianu S., Dinescu G., Blanco S. na Santamaria R. Carbon nanowall ihe nkiri dị ka nanostructured electrode ihe na vanadium redox eruba batrị.Nano Energy 1 (6), 833–839.https://doi.org/10.1016/j.nanoen.2012.07.003 (2012).
Opar DO, Nankya R., Lee J., na Yung H. graphene-mgbanwe mesoporous carbon nke nwere akụkụ atọ nwere mmetụta maka batrị vanadium redox na-arụ ọrụ dị elu.electrochemistry.Ọrụ 330, 135276. https://doi.org/10.1016/j.electacta.2019.135276 (2020).