Cov kws tshawb fawb tau nthuav tawm lub tswv yim tshiab rau kev txhim kho cov kev ua haujlwm catalytic siv tungsten suboxide ua ib qho atom catalyst (SAC). Lub tswv yim no, uas txhim kho cov tshuaj tiv thaiv hydrogen evolution (HER) hauv cov hlau platinum (pt) los ntawm 16.3 zaug, ua rau lub teeb pom kev ntawm kev tsim cov thev naus laus zis tshiab electrochemical catalyst.

Hydrogen tau raug touted ua ib qho kev cog lus lwm txoj rau fossil fuels. Txawm li cas los xij, feem ntau ntawm cov qauv kev lag luam hydrogen ntau lawm tuaj nrog cov teeb meem ib puag ncig, tso cov pa roj carbon dioxide thiab cov pa roj hauv tsev loj.

Electrochemical dej splitting yog suav hais tias yog ib txoj hauv kev rau kev tsim cov hydrogen huv. Pt yog ib qho ntawm feem ntau siv catalysts los txhim kho HER kev ua tau zoo nyob rau hauv electrochemical dej splitting, tab sis tus nqi siab thiab tsis txaus ntawm Pt tseem yog ib qho teeb meem tseem ceeb rau kev lag luam loj.

SACs, qhov twg txhua hom hlau yog ib tus zuj zus rau ntawm cov khoom siv txhawb nqa, tau raug txheeb xyuas tias yog ib txoj hauv kev los txo cov kev siv Pt, raws li lawv muab ntau tshaj plaws ntawm Pt atoms.

Kev tshoov siab los ntawm cov kev tshawb fawb yav dhau los, uas feem ntau tsom rau SACs txhawb nqa los ntawm cov ntaub ntawv carbon-based, KAIST pab pawg tshawb fawb coj los ntawm xibfwb Jinwoo Lee los ntawm Department of Chemical and Biomolecular Engineering tau tshawb xyuas cov khoom siv txhawb nqa ntawm SACs.

Xib fwb Lee thiab nws cov kws tshawb fawb tau qhia mesoporous tungsten suboxide raws li cov khoom txhawb nqa tshiab rau atomically dispersed Pt, vim qhov no tau xav tias yuav muab cov hluav taws xob hluav taws xob siab thiab muaj kev sib koom ua ke nrog Pt.

Lawv piv cov kev ua tau zoo ntawm ib leeg-atom Pt txhawb nqa los ntawm carbon thiab tungsten suboxide feem. Cov txiaj ntsig tau qhia tias cov txiaj ntsig kev txhawb nqa tau tshwm sim nrog tungsten suboxide, uas qhov kev ua haujlwm loj ntawm ib leeg-atom Pt txhawb nqa los ntawm tungsten suboxide yog 2.1 npaug ntau dua li ntawm ib leeg-atom Pt txhawb nqa los ntawm carbon, thiab 16.3 npaug siab dua li ntawm Pt. nanoparticles txhawb los ntawm carbon.

Pab neeg no tau qhia txog kev hloov pauv hauv cov qauv hluav taws xob ntawm Pt los ntawm kev them nqi hloov ntawm tungsten suboxide mus rau Pt. Qhov tshwm sim no tau tshaj tawm los ntawm qhov muaj zog hlau-txhawb kev sib cuam tshuam ntawm Pt thiab tungsten suboxide.

HER kev ua tau zoo tuaj yeem txhim kho tsis tau tsuas yog los ntawm kev hloov cov qauv hluav taws xob ntawm cov hlau txhawb nqa, tab sis kuj los ntawm kev txhawb nqa lwm txoj kev txhawb nqa, cov nyhuv spillover, pawg tshawb fawb tau tshaj tawm. Hydrogen spillover yog ib qho tshwm sim uas adsorbed hydrogen migrate los ntawm ib qhov chaw mus rau lwm qhov, thiab nws tshwm sim yooj yim dua li Pt loj me me.

Cov kws tshawb fawb tau piv cov kev ua tau zoo ntawm ib leeg-atom Pt thiab Pt nanoparticles txhawb nqa los ntawm tungsten suboxide. Ib qho atom Pt txhawb nqa los ntawm tungsten suboxide tau nthuav tawm ntau dua ntawm hydrogen spillover tshwm sim, uas txhim kho Pt huab hwm coj kev ua haujlwm rau hydrogen evolution txog 10.7 npaug piv rau Pt nanoparticles txhawb los ntawm tungsten suboxide.

Xib fwb Lee tau hais tias, "Kev xaiv cov khoom txhawb nqa zoo yog qhov tseem ceeb rau kev txhim kho electrocatalysis hauv hydrogen ntau lawm. Lub tungsten suboxide catalyst peb tau siv los txhawb Pt hauv peb txoj kev tshawb fawb qhia tau hais tias kev sib cuam tshuam ntawm cov hlau zoo sib xws thiab kev txhawb nqa tuaj yeem txhim kho qhov ua tau zoo ntawm cov txheej txheem. "