Sau rau hauv daim ntawv hauv qab no thiab peb yuav xa email rau koj PDF version ntawm "Kev txhim kho thev naus laus zis tshiab los hloov cov pa roj carbon dioxide rau hauv cov roj ua kua"
Cov pa roj carbon dioxide (CO2) yog cov khoom siv hluav taws xob hluav taws xob hluav taws xob thiab cov khoom siv hluav taws xob ntau tshaj plaws, uas tuaj yeem hloov rov qab mus rau hauv cov roj siv tau zoo. Ib txoj hauv kev zoo los hloov CO2 emissions rau hauv cov khoom noj roj yog cov txheej txheem hu ua electrochemical txo. Tab sis kom ua lag luam muaj txiaj ntsig zoo, cov txheej txheem yuav tsum tau txhim kho los xaiv lossis tsim cov khoom lag luam uas xav tau ntau dua. Tam sim no, raws li tau tshaj tawm hauv phau ntawv xov xwm Nature Energy, Lawrence Berkeley National Laboratory (Berkeley Lab) tau tsim ib txoj hauv kev tshiab los txhim kho qhov chaw ntawm cov tooj liab catalyst siv rau cov tshuaj tiv thaiv, yog li ua kom cov txheej txheem xaiv tau.
Alexis, tus kws tshawb fawb laus hauv Department of Chemical Sciences ntawm Berkeley Lab thiab tus xibfwb ntawm chemical engineering ntawm University hais tias "Txawm hais tias peb paub tias tooj liab yog qhov zoo tshaj plaws catalyst rau cov tshuaj tiv thaiv no, nws tsis muaj kev xaiv siab rau cov khoom xav tau," ntawm California, Berkeley. Spell hais tias. "Peb pab neeg tau pom tias koj tuaj yeem siv qhov chaw ib puag ncig hauv zos ntawm catalyst los ua ntau yam tswv yim los muab cov kev xaiv zoo li no."
Hauv cov kev tshawb fawb yav dhau los, cov kws tshawb fawb tau tsim cov xwm txheej meej los muab qhov zoo tshaj plaws hluav taws xob thiab tshuaj lom neeg ib puag ncig rau kev tsim cov khoom siv carbon nplua nuj nrog cov nqi lag luam. Tab sis cov xwm txheej no tsis zoo rau cov xwm txheej uas ib txwm tshwm sim hauv cov roj hluav taws xob uas siv cov khoom siv dej ua dej.
Txhawm rau txiav txim siab tus qauv tsim uas tuaj yeem siv rau hauv cov roj cell dej ib puag ncig, ua ib feem ntawm Energy Innovation Center qhov project ntawm Ministry of Energy's Liquid Sunshine Alliance, Tswb thiab nws pab neeg tau tig mus rau ib txheej nyias ntawm ionomer, uas tso cai rau qee qhov kev them nqi. molecules (ions) kom dhau mus. Tshem tawm lwm cov ions. Vim lawv cov khoom siv tshuaj lom neeg zoo heev, lawv tshwj xeeb yog tsim rau muaj kev cuam tshuam zoo rau microenvironment.
Chanyeon Kim, tus kws tshawb fawb postdoctoral hauv pawg Tswb thiab thawj tus kws sau ntawv, tau thov kom lub tsho tiv no ntawm tooj liab catalysts nrog ob hom ionomers, Nafion thiab Sustainion. Pab neeg xav tias ua li ntawd yuav tsum hloov qhov chaw nyob ze ntawm lub catalyst - nrog rau cov pH thiab cov dej thiab cov pa roj carbon dioxide - qee txoj hauv kev los coj cov tshuaj tiv thaiv los tsim cov khoom uas muaj cov pa roj carbon monoxide uas tuaj yeem hloov mus rau hauv cov tshuaj muaj txiaj ntsig zoo. Cov khoom lag luam thiab cov roj ua kua.
Cov kws tshawb fawb tau siv cov txheej nyias nyias ntawm txhua ionomer thiab ob txheej txheej ntawm ob ionomers rau ib zaj duab xis tooj liab txhawb los ntawm cov khoom siv polymer los ua ib zaj duab xis, uas lawv tuaj yeem ntxig ze ntawm ib qho kawg ntawm tes-zoo li electrochemical cell. Thaum txhaj cov pa roj carbon dioxide rau hauv lub roj teeb thiab siv qhov hluav taws xob, lawv ntsuas tag nrho cov tam sim no ntws los ntawm lub roj teeb. Tom qab ntawd lawv ntsuas cov roj thiab cov kua uas tau khaws cia rau hauv lub pas dej uas nyob ib sab thaum cov tshuaj tiv thaiv. Rau ob-txheej txheej, lawv pom tias cov khoom lag luam muaj cov pa roj carbon ntau suav nrog 80% ntawm lub zog siv los ntawm cov tshuaj tiv thaiv - siab dua 60% hauv cov ntaub ntawv tsis muaj coated.
"Lub sandwich txheej no muab qhov zoo tshaj plaws ntawm ob lub ntiaj teb: cov khoom lag luam siab xaiv thiab kev ua haujlwm siab," Bell hais. Ob txheej txheej saum npoo tsis yog tsuas yog zoo rau cov khoom uas muaj cov pa roj carbon ntau, tab sis kuj ua rau muaj zog tam sim no nyob rau tib lub sijhawm, qhia txog kev nce hauv kev ua haujlwm.
Cov kws tshawb fawb tau txiav txim siab tias qhov kev txhim kho cov lus teb yog qhov tshwm sim ntawm qhov siab ntawm CO2 concentration nyob rau hauv cov txheej ncaj qha rau saum cov tooj liab. Tsis tas li ntawd, cov khoom tsis zoo uas tau them nyiaj rau hauv thaj av nruab nrab ntawm ob lub ionomers yuav tsim cov acidity qis hauv zos. Qhov kev sib xyaw ua ke no cuam tshuam cov kev sib pauv kev sib tham uas zoo li tshwm sim thaum tsis muaj ionomer films.
Txhawm rau txhawm rau txhim kho qhov ua tau zoo ntawm cov tshuaj tiv thaiv, cov kws tshawb fawb tau tig mus rau yav dhau los ua pov thawj thev naus laus zis uas tsis tas yuav muaj cov yeeb yaj kiab ionomer ua lwm txoj hauv kev los nce CO2 thiab pH: pulsed voltage. Los ntawm kev siv cov hluav taws xob hluav taws xob mus rau ob txheej txheej ionomer txheej, cov kws tshawb fawb tau ua tiav 250% nce hauv cov khoom lag luam uas muaj cov pa roj carbon ntau piv rau cov khoom tsis muaj tooj liab thiab cov hluav taws xob zoo li qub.
Txawm hais tias qee cov kws tshawb fawb tsom lawv txoj haujlwm ntawm kev tsim cov catalysts tshiab, qhov kev tshawb pom ntawm cov catalyst tsis suav nrog kev ua haujlwm. Kev tswj hwm ib puag ncig ntawm qhov chaw catalyst yog ib txoj kev tshiab thiab txawv.
"Peb tsis tau los nrog cov catalyst tshiab kiag li, tab sis siv peb txoj kev nkag siab ntawm cov tshuaj tiv thaiv kinetics thiab siv qhov kev paub no los coj peb hauv kev xav txog kev hloov ib puag ncig ntawm qhov chaw catalyst," said Adam Weber, tus kws tshaj lij engineer. Cov kws tshawb fawb hauv kev siv tshuab hluav taws xob ntawm Berkeley Laboratories thiab tus kws sau ntawv ntawm cov ntaub ntawv.
Cov kauj ruam tom ntej yog los nthuav cov khoom ntawm coated catalysts. Pab pawg Berkeley Lab qhov kev sim ua ntej koom nrog cov qauv me me, uas yooj yim dua li qhov loj-qhov chaw ntxeem tau cov qauv tsim nyog rau kev lag luam. "Nws tsis yog qhov nyuaj rau kev siv cov txheej txheem ntawm lub tiaj tus. Tab sis txoj kev lag luam tuaj yeem cuam tshuam nrog cov pob tooj liab me me, "Tswb hais. Ntxiv txheej txheej thib ob ntawm txheej yuav nyuaj. Ib qho ua tau yog sib tov thiab tso ob txheej txheej ua ke hauv cov kuab tshuaj, thiab cia siab tias lawv sib cais thaum cov kuab tshuaj evaporates. Yuav ua li cas yog lawv tsis? Tswb xaus lus tias: "Peb tsuas yog yuav tsum tau ntse dua." Xa mus rau Kim C, Bui JC, Luo X thiab lwm yam. Customized catalyst microenvironment rau electro-txo CO2 rau ntau cov khoom siv carbon siv ob txheej txheej ionomer txheej ntawm tooj liab. Nat Zog. 2021; 6(11): 1026-1034. doi: 10.1038/s41560-021-00920-8 ib
Kab lus no yog rov ua dua los ntawm cov ntaub ntawv hauv qab no. Lus Cim: Cov khoom yuav raug kho kom ntev thiab cov ntsiab lus. Yog xav paub ntxiv, thov hu rau qhov chaw hais.
Post lub sij hawm: Nov-22-2021
