Carbonized melamine ua npuas ncauj, qhia los ntawm ib pab neeg coj los ntawm Jaephil Cho ntawm Ulsan National Institute of Science thiab Technology (Korea), ib qho tshiab uas muaj txiaj ntsig zoo electrocatalyst kom txo cov pa oxygen hauv cov roj hlwb thiab cov roj teeb, muab cov kev daws teeb meem uas tuaj yeem txo cov nqi tab sis muab cov roj teeb hluav taws xob zoo heev thiab cov roj ntsha.
Ib pab kws tshawb fawb Kauslim Teb thiab Asmeskas tau qhia txog cov khoom siv tshiab rau cov electrodes uas ua los ntawm cov ua npuas ncauj melamine pheej yig thiab cov pa roj carbon dub. Qhov porosity siab ua rau kev thauj mus los sai thiab muaj ntau lub chaw ua haujlwm catalytic ua rau cov haujlwm txo cov pa oxygen ntawm cov cathodes rau cov roj teeb thiab cov roj teeb hlau-cua ntau ntxiv.
Cov tshuaj tiv thaiv uas tshwm sim ntawm cathodes ntawm cov roj hlwb thiab cov hlau-cua roj teeb yog cov electrochemical txo cov pa oxygen, uas yog cov tshuaj txo cov pa oxygen (ORR). Cov tshuaj tiv thaiv no yog qhov cuam tshuam loj heev vim tias nws qhov qis qis, thiab kev ua haujlwm ntawm cov hlwb qis dua li qhov nws ua tau.
Lub catalytic cathode yuav tsum xyuas kom meej tias oxygen reacts nrog dej, nqa electrons los ua OH-ions hauv alkaline tov. Qhov teeb meem yog hais tias nyob rau hauv ib tug complex system uas muaj cov khoom, kua, thiab gaseous reactants, thauj cov txheej txheem feem ntau qeeb heev thiab inhibit tus txheej txheem, tshwj xeeb tshaj yog thaum tso tawm nrog ntau dua tam sim no ceev.
Cathodes ua los ntawm cov pa roj carbon monoxide (carbon dub) uas lub catalytically active hlau zoo li platinum yog finely dispersed yuav ua tau zoo heev txo qhov kinetic inhibition. Txawm li cas los xij, lawv kim heev thiab tsis ruaj khov, yog li ua rau lawv siv tsis tau rau kev siv dav.
Ib pab neeg coj los ntawm Jaephil Cho ntawm Ulsan National Institute of Science thiab Technology (Korea) thiab Meilin Liu ntawm Georgia Institute of Technology (USA) yog li txhawm rau txhim kho kev lag luam ntau dua.
Lawv tau txais kev tshoov siab los ntawm cov qauv tetrapod (Greek tetra: plaub, podes: ko taw) ntawm cov dej tawg los ua kom cov khoom siv hluav taws xob tshiab muaj txiaj ntsig zoo. Tetrapods, uas nws plaub "ko taw" yog taw tes rau ntawm cov ces kaum ntawm lub tswv yim tetrahedron, yog tsim nyob rau ntawm ntug dej hiav txwv nrog rau ze cov dams thiab piers kom txo tau lub zog ntawm nthwv dej ntawm ntug dej hiav txwv. Cov qauv no tseem muab cov chaw dawb huv rau cov ntaub ntawv hauv hiav txwv hauv lawv cov kab noj hniav loj. Thaum melamine ua npuas ncauj yog pyrolyzed thiab av nrog ib tug mortar thiab pestle, nws tsim microscopic fragments zoo li tetrapods.
Cov kws tshawb fawb tau kho melamine ua npuas ncauj nrog hlau chloride thiab nitrogen-doped ketjenblack (ua pellets ntawm carbon dub). Lawv carbonized cov khoom no thiab muab rho tawm nrog sulfuric acid. Qhov tshwm sim nanotetrapods studded nrog nanoparticles ntawm cov pa roj carbon dub muaj qhov tshwj xeeb ntawm qhov chaw siab heev, ntau qhov chaw ua haujlwm catalytically (Fe / Fe3C, thiab CN pawg), thiab ntau qhov pores uas tso cai rau kev thauj mus los sai. Cathodes ua los ntawm cov khoom siv electrode tshiab no yog cov khoom siv ruaj khov thiab kev ua haujlwm zoo heev, piv rau cov hlau-raws li cathodes - ntawm tus nqi qis dua. Cov no tuaj yeem sawv cev rau qhov pib muaj txiaj ntsig zoo rau lub cim tshiab ntawm pheej yig thiab muaj txiaj ntsig zoo hlau-cua roj teeb thiab roj hlwb.
SINOYQX txhawb nqa qee lub tsev kawm ntawv thiab cov tsev kawm qib siab hauv Suav teb rau carbonizing melamine ua npuas ncauj rau kev txo cov pa oxygen hauv cov roj teeb thiab cov roj teeb.
Qee qhov tau hais los ntawm http://www.chemistryviews.org/details/ezine/4153391/Inspired_by_a_Breakwater.html