Kev nce qib thiab kev tshuaj xyuas kev lag luam ntawm kev tsim hydrogen los ntawm electrolysis ntawm cov oxides khov kho

Kev nce qib thiab kev tshuaj xyuas kev lag luam ntawm kev tsim hydrogen los ntawm electrolysis ntawm cov oxides khov kho

Cov khoom siv electrolyzer oxide khov kho (SOE) siv cov dej kub kub (600 ~ 900 ° C) rau electrolysis, uas ua haujlwm tau zoo dua li alkaline electrolyzer thiab PEM electrolyzer. Xyoo 1960, Tebchaws Meskas thiab Lub Tebchaws Yelemees tau pib tshawb fawb txog cov dej kub kub SOE. Lub hauv paus ntsiab lus ua haujlwm ntawm SOE electrolyzer tau pom hauv Daim Duab 4. Cov hydrogen thiab cov dej kub rov ua dua nkag mus rau hauv qhov system reaction los ntawm anode. Cov dej kub yog electrolyzed rau hauv hydrogen ntawm cathode. O2 tsim los ntawm cathode txav mus los ntawm cov electrolyte khov kho mus rau anode, qhov twg nws rov ua ke los tsim cov pa oxygen thiab tso cov electrons.

Tsis zoo li alkaline thiab proton pauv membrane electrolytic cells, SOE electrode reacts nrog dej vapor sib cuag thiab ntsib qhov kev sib tw ntawm kev ua kom thaj chaw sib txuas ntawm electrode thiab dej vapor sib cuag. Yog li ntawd, SOE electrode feem ntau muaj cov qauv porous. Lub hom phiaj ntawm dej vapor electrolysis yog kom txo qhov muaj zog thiab txo cov nqi ua haujlwm ntawm cov kua dej electrolysis ib txwm muaj. Qhov tseeb, txawm hais tias tag nrho cov zog xav tau ntawm cov dej decomposition reaction nce me ntsis nrog rau qhov kub thiab txias, qhov hluav taws xob xav tau txo qis heev. Raws li qhov kub electrolytic nce, ib feem ntawm lub zog xav tau yog muab los ua cua sov. SOE muaj peev xwm tsim hydrogen nyob rau hauv qhov muaj qhov kub thiab txias. Txij li thaum cov reactors nuclear txias-kub kub tuaj yeem ua kom sov txog 950 ° C, nuclear zog tuaj yeem siv ua qhov chaw zog rau SOE. Tib lub sijhawm, kev tshawb fawb qhia tau hais tias lub zog rov ua dua tshiab xws li geothermal zog kuj muaj peev xwm ua qhov chaw kub ntawm cov pa electrolysis. Kev ua haujlwm ntawm qhov kub thiab txias tuaj yeem txo cov roj teeb voltage thiab nce tus nqi tshuaj tiv thaiv, tab sis nws kuj ntsib qhov kev sib tw ntawm cov khoom siv thermal stability thiab sealing. Ntxiv mus, cov roj uas tsim los ntawm cathode yog cov hydrogen sib xyaw, uas yuav tsum tau sib cais thiab ntxuav ntxiv, ua rau tus nqi ntau dua piv rau cov kua dej electrolysis ib txwm muaj. Kev siv cov proton-conducting ceramics, xws li strontium zirconate, txo tus nqi ntawm SOE. Strontium zirconate qhia tau tias muaj kev coj ua proton zoo heev ntawm li 700 ° C, thiab ua rau cathode tsim cov hydrogen purity siab, ua kom yooj yim rau cov khoom siv electrolysis pa.

Yan et al. [6] tau tshaj tawm tias zirconia ceramic raj ruaj khov los ntawm calcium oxide tau siv ua SOE ntawm cov qauv txhawb nqa, qhov chaw sab nraud tau coated nrog nyias (tsawg dua 0.25 hli) porous lanthanum perovskite ua anode, thiab Ni / Y2O3 ruaj khov calcium oxide cermet ua cathode. Ntawm 1000 ° C, 0.4A / cm2 thiab 39.3W input fais fab, lub peev xwm tsim hydrogen ntawm lub unit yog 17.6NL / h. Qhov tsis zoo ntawm SOE yog qhov overvoltage los ntawm kev poob siab ohm uas yog qhov tshwm sim ntawm kev sib txuas ntawm cov hlwb, thiab qhov siab overvoltage concentration vim yog qhov txwv ntawm kev thauj mus los ntawm vapor diffusion. Nyob rau hauv xyoo tas los no, planar electrolytic cells tau nyiam ntau lub siab [7-8]. Nyob rau hauv sib piv rau tubular cells, flat cells ua rau kev tsim khoom ntau dua compact thiab txhim kho hydrogen ntau lawm efficiency [6]. Tam sim no, qhov teeb meem tseem ceeb rau kev siv industrial ntawm SOE yog qhov ruaj khov mus sij hawm ntev ntawm electrolytic cell [8], thiab cov teeb meem ntawm electrode laus thiab deactivation yuav tshwm sim.