Roj cell yog ib yam khoom siv hluav taws xob hloov hluav taws xob, uas tuaj yeem hloov hluav taws xob hluav taws xob ntawm cov roj rau hauv hluav taws xob hluav taws xob. Nws yog hu ua roj cell vim nws yog ib qho khoom siv hluav taws xob hluav taws xob ua ke nrog lub roj teeb. Lub cell roj uas siv hydrogen li roj yog hydrogen roj cell. Hydrogen roj cell tuaj yeem nkag siab raws li cov tshuaj tiv thaiv ntawm dej electrolysis rau hauv hydrogen thiab oxygen. Cov txheej txheem tshuaj tiv thaiv ntawm hydrogen roj cell yog huv thiab siv tau. Hydrogen roj cell tsis txwv los ntawm 42% thermal efficiency ntawm Carnot voj voog siv nyob rau hauv cov tsoos tsheb cav, thiab cov efficiency yuav ncav cuag ntau tshaj 60%.
Tsis zoo li cov foob pob hluav taws, cov roj hluav taws xob hydrogen tsim lub zog kinetic los ntawm cov tshuaj tiv thaiv hnyav ntawm hydrogen thiab oxygen combustion, thiab tso tawm Gibbs dawb zog hauv hydrogen los ntawm cov khoom siv catalytic. Gibbs dawb zog yog ib qho hluav taws xob hluav taws xob uas cuam tshuam nrog entropy thiab lwm yam kev xav. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm hydrogen roj cell yog tias hydrogen yog decomposed rau hauv hydrogen ions (ie protons) thiab electrons los ntawm catalyst (Platinum) nyob rau hauv qhov zoo electrode ntawm lub cell. Hydrogen ions dhau los ntawm cov proton pauv daim nyias nyias mus rau qhov tsis zoo electrode thiab oxygen react los ua dej thiab cua sov, thiab cov electrons coj los ntawm qhov zoo electrode mus rau qhov tsis zoo electrode los ntawm sab nraud Circuit Court los tsim hluav taws xob lub zog.
Hauvroj cell pawg, cov tshuaj tiv thaiv ntawm hydrogen thiab oxygen yog nqa tawm, thiab muaj kev hloov pauv hauv cov txheej txheem, ua rau tam sim no. Tib lub sijhawm, hydrogen reacts nrog oxygen los tsim dej.
Raws li cov tshuaj tiv thaiv pas dej ua ke, cov thev naus laus zis tseem ceeb ntawm cov roj cell pawg yog "proton exchange membrane". Ob sab ntawm zaj duab xis yog nyob ze rau txheej catalyst kom decompose cov hydrogen rau hauv ions them. Vim hais tias cov hydrogen molecule me me, cov hydrogen nqa electrons tuaj yeem txav mus rau qhov tsis sib xws los ntawm qhov me me ntawm zaj duab xis. Txawm li cas los xij, nyob rau hauv tus txheej txheem ntawm hydrogen nqa electrons hla lub qhov ntawm zaj duab xis, cov electrons raug stripped los ntawm cov molecules, tawm hauv tsuas yog tus nqi zoo hydrogen protons mus txog rau lwm qhov kawg ntawm zaj duab xis.
Hydrogen protonsyog attracted rau lub electrode nyob rau sab nraud ntawm zaj duab xis thiab ua ke nrog oxygen molecules. Cov electrode daim hlau ntawm ob sab ntawm zaj duab xis faib hydrogen rau hauv qhov zoo hydrogen ions thiab electrons, thiab faib cov pa oxygen rau hauv cov pa atoms kom ntes cov electrons thiab tig mus rau oxygen ions (tsis zoo hluav taws xob). Cov hluav taws xob tsim hluav taws xob tam sim no ntawm cov phaj electrode, thiab ob lub hydrogen ions thiab ib qho oxygen ion ua ke los ua dej, uas dhau los ua "khoom" nkaus xwb hauv cov txheej txheem tshuaj tiv thaiv. Hauv qhov tseeb, tag nrho cov txheej txheem ua haujlwm yog cov txheej txheem tsim hluav taws xob. Nrog rau kev nce qib ntawm cov tshuaj tiv thaiv oxidation, cov hluav taws xob txuas ntxiv mus rau qhov tam sim no yuav tsum tau tsav tsheb.
Post lub sij hawm: Feb-12-2022