Lub membrane electrode (membrane electrode los ua ke, MEA) yog lub hauv paus tseem ceeb ntawm cov khoom siv hluav taws xob hloov hluav taws xob. Nws yog tsim los ntawm peb qhov chaw: proton exchange membrane (PEM), catalyst txheej (CL) thiab roj diffusion txheej (GDL).
Tus qauv ntawm MEA
Lub luag haujlwm ntawm cov roj diffusion txheej hauv MEA yog dab tsi?
Huab cua qhia thiab dej ua haujlwm
Nyob rau hauv PEMFC daim nyias nyias electrode, cov roj diffusion txheej feem ntau ua lub luag haujlwm ntawm kev thauj cov pa roj thiab ya raws, thiab yog lub luag haujlwm rau kev coj cov hydrogen thiab oxygen hauv cov phaj bipolar rau cov txheej txheem catalytic, muab cov pa roj txaus rau cov txheej txheem catalytic kom hnov mob; tib lub sijhawm. Cov dej uas tsim nyob rau hauv cov txheej txheem yog pauv mus rau lub phaj bipolar los tiv thaiv cov khoom los ntawm accumulating nyob rau hauv lub catalytic txheej thiab cuam tshuam cov kev kawm ntxiv ntawm cov tshuaj tiv thaiv. Yog li ntawd, lub diffusion txheej yuav tsum yog cov khoom ntxeem tau nrog cov huab cua zoo permeability thiab cov kua dej zoo.
Kev coj ua thiab kev txhawb nqa muaj nuj nqi
Cov txheej txheej diffusion yuav tsum muaj cov khoom siv hluav taws xob zoo, yog li cov khoom siv hluav taws xob tsim los ntawm cov txheej txheem catalytic tuaj yeem dhau los ntawm cov txheej txheem diffusion smoothly thiab txav mus rau lub phaj bipolar. Ntxiv nrog rau cov haujlwm tseem ceeb no, cov txheej txheem diffusion kuj tseem muab qee qhov kev txhawb nqa lub zog rau cov membrane electrode, thiab cov txheej txheem diffusion yog qhov tuab tshaj plaws ntawm daim nyias nyias electrode, feem ntau ntau dua 100 μm.
Cov roj diffusion txheej feem ntau yog ua los ntawm cov hlau sintered (titanium hnov lossis npib tsib xee hnov) raws li cov khoom siv raw, nrog cov porosity ntawm 60 feem pua rau 80 feem pua. Tom qab kev kho hydrophobic, hydrophilic channels thiab hydrophobic channel yog tsim. Cov kab dej hydrophilic tuaj yeem hloov pauv cov txheej txheem catalyst Cov dej hauv cov phaj bipolar yog coj mus rau hauv lub phaj bipolar, thaum cov kab hydrophobic muab kev thauj mus los rau cov pa roj.
sintered nickel xav
sintered titanium xav
