Kev siv cov ntaub ntawv nanostructured ntawm peb-dimensional nickel foam cov ntaub ntawv ua electrocatalysts rau dej tawg

Kev txo qis ntawm fossil fuels thiab kev txhawj xeeb loj zuj zus txog lub zog thiab ib puag ncig teeb meem tau ua rau muaj kev tshawb fawb dav dav los tsim cov khoom siv hluav taws xob.Electrochemical electrolysisdej yog suav hais tias yog ib lub tswv yim zoo rau kev tsim cov roj hydrogen. Txawm li cas los xij, cov dej tawg tau zoo yuav tsum muaj cov khoom siv hluav taws xob zoo thiab ruaj khov uas tuaj yeem ua kom cov kinetics ntawm oxygen-extraction reaction (OER) thiab hydrogen-extraction reaction (HER). Noble hlau uas muaj cov catalysts, xws li Pt thiab nws cov alloys, RuO2 thiab IrO2, yog tam sim no muaj txiaj ntsig catalysts rau catalyzing OER thiab HER. Txawm li cas los xij, tus nqi siab thiab tsis tshua muaj txiaj ntsig ntawm cov hlau tsis muaj txiaj ntsig tau cuam tshuam lawv daim ntawv thov loj thiab kev txhim kho cov thev naus laus zis thev naus laus zis. Txhawm rau kov yeej cov kev txwv no, kev siv zog ntau tau ua rau tsim thiab tsim cov hlau tsis muaj nuj nqis electrocatalysts siv lub ntiaj teb-ntau cov ntaub ntawv raws li kev siv nyiaj txiag rau OER thiab OERHER. Kev hloov pauv hlau oxides, sulfides, phosphides, cov ntaub ntawv carbon, selenides, thiab cov hlau sib xyaw ua ke tau kawm ntau thiab tau pom tias muaj kev ua tau zoo rau OER thiab HER. Txawm li cas los xij, feem ntau ntawm cov electrocatalysts xav tau ntau dua qhov muaj peev xwm tshaj li cov khoom siv hlau zoo nkauj, thiab kev txhim kho lawv cov kev ruaj ntseg tseem ceeb heev. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau tsim kom muaj tus nqi qis thiab muaj txiaj ntsig zoo ntawm cov qauv electrode nrog kev ua haujlwm siab thiab kev ruaj ntseg mus sij hawm ntev rau kev sib faib dej kom zoo.

Nyob rau hauv daim ntawv thov electrochemical, ob lub tswv yim tseem ceeb tau siv los npaj cov electrodes. Thawj thiab feem ntau siv cov txheej txheem suav nrog kev siv cov catalysts hauv cov hmoov nplej. Feem ntau, electrodes yog tsim los ntawm kev siv slurries ntawm cov ntaub ntawv electroactive, conductivity enhancers, thiab adhesives ntawm conductive substrates. Txawm li cas los xij, txoj hauv kev no tsis yog tsis muaj qhov tsis zoo. Lub ntsiab tsis zoo yog qhov yuav tsum tau rau ib qho hluav taws xob insulating binder, uas txo qhov chaw sib cuag ntawm electrolyte thiab catalyst. Qhov no tuaj yeem ua rau thaiv qhov chaw ua haujlwm catalytically, uas ua rau muaj kev ua haujlwm siab thiab txo qis electrocatalytic kev ua haujlwm. Tsis tas li ntawd, cov electrodes kuj tsis ruaj khov, vim tias cov catalyst txuas nrog zoo li tev tawm ntawm cov khoom siv hauv qab ntawm qhov siab tam sim no. Qhov thib ob lub tswv yim tseem ceeb rau kev npaj electrode yog siv cov khoom siv hlau zoo uas yog electrodeposited ncaj qha mus rau cov khoom siv hluav taws xob, xws li npib tsib xee ua npuas ncauj, tooj liab ntawv ci, carbon daim ntaub los yog ntawv, FTO, stainless hlau thiab nickel ntawv ci. Txawm li cas los xij, txoj hauv kev no tsis yog yam tsis muaj kev txwv. Nws yog ib qho nyuaj rau precisely tswj qhov chaw nkag tau ntawm cov ntaub ntawv active deposited thiab, yog li ntawd, cov electrode kev ua tau zoo diminishes nrog nce zaj duab xis thickness vim lub inaccessibility ntawm lub substrate rau lub catalytically active chaw nyob rau hauv. Tsis tas li ntawd, qhov nyuaj thiab tus nqi siab ntawm txoj kev zoo heev cuam tshuam nws txoj kev siv. Yog li ntawd, txoj kev loj hlob ntawm cov nqi-zoo fabrication txheej txheem rauPeb-dimensional (3D) electrodesyog qhov tsim nyog rau kev ua tiav cov ntawv thov electrochemical.

Txoj kev loj hlob ntawm cov ntaub ntawv tshiab peb-dimensional hlau nrog cov qauv ntxeem tau thiab cov chaw tshwj xeeb saum npoo tau nyiam cov xim zoo nkauj vim lawv lub peev xwm los txo cov ion diffusion ntev thiab nce ionic thiab hluav taws xob conductivity. Yog li ntawd, ib qho kev cog lus rau kev tsim electrocatalyst yog los ua ke cov txheej txheem sib txawv kom tsim tau ib qho nanostructured composite ntawm catalyst carriers uas muab siab conductivity, loj deg cheeb tsam thiab siab stability.Nickel ua npuas ncauj(NF), cov khoom lag luam muaj thiab pheej yig, tau siv dav hauv substrate thiab cov khoom thauj khoom rau cov khoom siv hluav taws xob vim nws qhov kev xav tau peb-dimensional open-pore qauv, siab hluav taws xob conductivity, thiab loj tshwj xeeb deg.The micropores thiab jagged txaus cov channel hauv NFs kuj tseem muab kev hloov pauv huab cua zoo thiab thaj chaw loj hauv ib cheeb tsam. Ntau lub substrates, suav nrog cov hlau sib txawv, meshes, foils thiab fabrics, tau tshawb nrhiav los ua cov khoom siv hluav taws xob xws li lithium-ion roj teeb, supercapacitors, hnub ci hlwb thiab dej sib cais. Tshwj xeeb, NFs ntxeem tau nyiam vim lawv cov nqi qis, hluav taws xob conductivity, thiab loj electroactive nto cheeb tsam, uas yog zoo tagnrho rau loading catalysts thiab nce electrochemical active chaw. Tsis tas li ntawd, NFs ntxeem tau muaj qhov zoo hauv kev txhim kho kev thauj khoom loj ntawm electrolytes, ua rau lawv tsim nyog cov neeg sib tw rau thaj chaw siab saum npoo tam sim no hauv kev siv hluav taws xob. Kev loj hlob ncaj qha ntawm cov ntaub ntawv nquag ntawm npib tsib xee ua npuas ncauj kuj tseem txhim kho catalyst-substrate kev sib cuag rau kev hloov hluav taws xob zoo hauv cov dej tawg. Thaum supercapacitor thiab roj teeb electrodes tseem yog cov ntawv thov tseem ceeb rau NFs, cov kev tshawb fawb tsis ntev los no tau pom tias cov khoom siv hluav taws xob tso rau ntawm cov khoom no muaj kev ua haujlwm zoo tshaj OER tshaj Ni foils thiab nets. Cov ntaub ntawv no tuaj yeem siv rau hauv lawv daim ntawv ntuj lossis dai kom zoo nkauj nrog cov ntaub ntawv nquag, thiab cov foams tuaj yeem siv tau ob qho tib si los ua cov khoom sib sau thiab txhawb nqa substrates. Yog li, kev loj hlob ntawm nanostructured, ntiaj teb-nplua nuj catalytic cov ntaub ntawv ntawm NF substrates tuav cov lus cog tseg rau kev txhim kho cov khoom siv electrode siab heev rau lub zog cia / hloov khoom siv. Txawm hais tias lub ntiaj teb nplua nuj electrocatalysts cog ncaj qha rau ntawm npib tsib xee ua npuas ncauj feem ntau muaj, peb-seem electrodes ntawm nickel ua npuas ncauj rau OERs thiab HERs tsis tau tshawb xyuas ntau, txawm hais tias lawv yog cov qauv porous hierarchical uas tsis tshua muaj nqi thiab yooj yim rau fabricate.