Txoj kev tshawb nrhiav pom tus yuam sij rau kev txhim kho roj teeb lub neej: Kev sib cuam tshuam ntawm cov khoom

Raws li kev tshaj tawm xov xwm txawv teb chaws, Feng Lin, tus kws tshaj lij hauv Department of Chemistry ntawm Virginia Tech College of Science, thiab nws pab neeg tshawb fawb pom tias cov roj teeb tawg thaum ntxov zoo li tau tsav los ntawm cov khoom ntawm cov khoom siv hluav taws xob, tab sis tom qab kaum tawm tus nqi. Tom qab looping, yuav ua li cas cov hais haum ua ke yog qhov tseem ceeb dua.

Lin hais tias "Txoj kev tshawb fawb no nthuav tawm cov lus zais ntawm yuav ua li cas tsim thiab tsim cov roj teeb electrodes rau lub neej ntev roj teeb," Lin hais. Tam sim no, Lin's lab tab tom ua haujlwm los tsim kho cov roj teeb hluav taws xob tshiab los tsim kom muaj kev them nqi sai, nqi qis dua, Lub neej ntev dua thiab ib puag ncig tus phooj ywg electrode architecture.

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Txoj kev tshawb nrhiav pom tus yuam sij rau kev txhim kho roj teeb lub neej: Kev sib cuam tshuam ntawm cov khoom
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Raws li kev tshaj tawm xov xwm txawv teb chaws, Feng Lin, tus kws tshaj lij hauv Department of Chemistry ntawm Virginia Tech College of Science, thiab nws pab neeg tshawb fawb pom tias cov roj teeb tawg thaum ntxov zoo li tau tsav los ntawm cov khoom ntawm cov khoom siv hluav taws xob, tab sis tom qab kaum tawm tus nqi. Tom qab looping, yuav ua li cas cov hais haum ua ke yog qhov tseem ceeb dua.

Lin hais tias "Txoj kev tshawb fawb no nthuav tawm cov lus zais ntawm yuav ua li cas tsim thiab tsim cov roj teeb electrodes rau lub neej ntev roj teeb," Lin hais. Tam sim no, Lin's lab tab tom ua haujlwm los tsim kho cov roj teeb hluav taws xob tshiab los tsim kom muaj kev them nqi sai, nqi qis dua, Lub neej ntev dua thiab ib puag ncig tus phooj ywg electrode architecture.

Duab Source: Feng Lin

"Thaum cov khoom siv hluav taws xob tso cai rau txhua tus neeg tuaj yeem teb sai sai rau cov teeb liab hluav taws xob, peb yuav muaj lub thawv zoo heev kom them cov roj teeb sai," Lin hais. "Peb zoo siab los ua kom peb txoj kev nkag siab ntawm cov tiam tom ntej ntawm cov roj teeb uas muaj nqi qis dua. ”

Kev tshawb fawb tau ua nrog kev koom tes nrog US Department of Energy's SLAC National Accelerator Laboratory, Purdue University thiab European Synchrotron Radiation Facility. Zhengrui Xu thiab Dong Ho, cov kws kho mob tom qab kawm tiav hauv Lin's lab, kuj yog tus kws sau ntawv hauv daim ntawv, ua cov khoom siv hluav taws xob, kev tsim roj teeb, thiab kev ntsuas roj teeb, thiab pab nrog X-ray thwmsim thiab kev tshuaj xyuas cov ntaub ntawv.

"Lub hauv paus tsev thaiv yog cov khoom no uas ua rau cov roj teeb hluav taws xob, tab sis thaum ntsuas, cov khoom no cuam tshuam nrog ib leeg," SLAC tus kws tshawb fawb Yijin Liu, tus khub ntawm Stanford Synchrotron Radiation Light Source (SSRL). "Yog tias koj xav ua cov roj teeb zoo dua, koj yuav tsum paub yuav ua li cas muab cov khoom ua ke."

Raws li ib feem ntawm txoj kev tshawb no, Lin, Liu thiab lwm cov npoj yaig siv cov tswv yim pom kev hauv computer los kawm seb tus neeg cov khoom uas ua rau cov electrodes ntawm cov roj teeb uas muaj peev xwm rov ua tau zoo li cas. Lub hom phiaj lub sij hawm no yog los kawm tsis yog ib tug neeg hais xwb, tab sis kuj yog txoj hauv kev uas lawv ua hauj lwm ua ke kom ntev los yog txo roj teeb lub neej. Lub hom phiaj ntawm qhov kawg yog kawm txoj hauv kev tshiab los txuas ntxiv lub neej ntawm cov qauv siv roj teeb.

Raws li ib feem ntawm txoj kev tshawb no, pab pawg tau kawm txog lub roj teeb cathode nrog X-rays. Lawv siv X-ray tomography los tsim kho 3D daim duab ntawm lub roj teeb cathode tom qab sib txawv them mus. Tom qab ntawd lawv txiav cov duab 3D no rau hauv cov kab 2D thiab siv cov kev pom hauv computer los txheeb xyuas cov khoom. Ntxiv rau Lin thiab Liu, txoj kev tshawb no suav nrog SSRL postdoctoral kws tshawb fawb Jizhou Li, Purdue University mechanical engineering xibfwb Keije Zhao, thiab Purdue University cov tub ntxhais kawm tiav Nikhil Sharma.

Cov kws tshawb fawb thaum kawg tau txheeb xyuas ntau dua 2,000 tus neeg hais lus, suav tsis tau tsuas yog tus kheej cov yam ntxwv xws li qhov loj, qhov zoo, thiab qhov roughness ntawm qhov chaw, tab sis kuj muaj xws li ntau npaum li cas cov khoom nyob rau hauv kev sib cuag ncaj qha nrog ib leeg thiab ntau npaum li cas cov khoom hloov pauv.

Tom qab ntawd, lawv tau saib seb txhua lub cuab yeej ua rau cov khoom tawg, thiab pom tias tom qab 10 lub voj voog, qhov loj tshaj plaws yog cov khoom ntawm tus kheej cov khoom, nrog rau qhov sib txawv ntawm cov khoom thiab qhov sib piv ntawm cov khoom ntim rau qhov chaw. Tom qab 50 lub voj voog, txawm li cas los xij, kev sib koom ua ke thiab pab pawg cov khoom ua rau cov khoom tawg-xws li nyob deb npaum li cas ntawm ob qhov sib txawv, ntau npaum li cas cov duab hloov, thiab seb cov pob ncaws pob elongated ntau npaum li cas muaj cov kev taw qhia zoo sib xws.

Liu tau hais tias "Qhov laj thawj tsis yog qhov particle nws tus kheej lawm, tab sis kev sib cuam tshuam ntawm cov particle-particle," Liu hais. Qhov kev tshawb pom no tseem ceeb vim nws txhais tau tias cov tuam txhab tsim khoom tuaj yeem tsim cov txheej txheem los tswj cov khoom no. Piv txwv li, lawv tuaj yeem siv cov khoom sib nqus lossis hluav taws xob sib txuas nrog cov khoom sib nqus, qhov kev tshawb pom tshiab tshaj tawm qhia tias qhov no yuav ua rau lub roj teeb ntev dua. "

Lin tau hais ntxiv tias: "Peb tau mob siab rau tshawb nrhiav yuav ua li cas thiaj li ua kom cov roj teeb EV ua haujlwm tau zoo nyob rau hauv kev them nyiaj ceev thiab qhov kub thiab txias. Ntxiv rau kev tsim cov khoom siv tshiab uas tuaj yeem txo cov nqi roj teeb los ntawm kev siv cov khoom siv pheej yig dua thiab ntau dua, peb lub chaw soj nstuam kuj tseem muaj kev sib zog ua kom nkag siab txog cov roj teeb coj mus deb ntawm qhov sib npaug. Peb tau pib kawm cov ntaub ntawv roj teeb thiab lawv cov lus teb rau ib puag ncig hnyav. "