Txheej txheej ntawm cov txheej txheem corrosion-resistant txheej ntawm titanium nto tuaj yeem zam qhov tsim ntawm oxide zaj duab xis rau ntawm qhov chaw ntawm titanium bipolar phaj thiab ua tau raws li qhov yuav tsum tau ua ntawm electrode phaj. Ntxiv nrog rau kev tiv thaiv corrosion thiab zoo heev hluav taws xob conductivity, lub txheej kuj yuav tsum muaj kev sib raug zoo zog nrog lub substrate.
titanium electrode
coated titanium anode
Nyob rau tib lub sijhawm, txij li qhov kub ntawm PEMFC yuav hloov ntawm chav tsev kub thiab 80 degree, cov txheej thiab cov khoom siv substrate yuav tsum muaj cov thermal expansion coefficients zoo sib xws. Txhawm rau kom tsis txhob delamination thiab tawg ntawm cov txheej txheem thaum lub sij hawm hloov kub, kev tiv thaiv ntawm cov khoom yuav ploj.
Cov txheej txheem siv feem ntau yog muab faib ua 2 pawg, uas yog cov txheej txheem hlau (cov hlau muaj txiaj ntsig, hlau-carbon / nitride) thiab cov txheej txheem carbon (graphite, conductive polymers, amorphous carbon, thiab lwm yam).
Kev ua haujlwm tsis zoo ntawm titanium bipolar daim hlau nrog cov txheej txheem sib txawv
Raws li ib feem tseem ceeb ntawm hydrogen roj hlwb, bipolar daim hlau ua lub luag haujlwm txiav txim siab hauv kev ua haujlwm ntawm tes, nqi thiab kav ntev. Ob qhov teeb meem tseem ceeb tam sim no txwv kev lag luam ntawm cov roj hluav taws xob hluav taws xob yog tus nqi thiab kev ua haujlwm ntev, thiab cov nqi ntawm cov phaj bipolar tau txiav txim siab rau qee yam los ntawm cov khoom siv electrode, khiav teb ua, thiab electrode txheej txheej txheej txheem.
Graphite thiab carbon-based composite cov ntaub ntawv tsis tuaj yeem ua tau raws li cov kev cai ntawm hydrogen roj hlwb nyob rau hauv cov nqe lus ntawm kev ua tau zoo, thiab cov ntaub ntawv hlau tau dhau los ua cov ntaub ntawv tseem ceeb rau hydrogen roj cell bipolar daim hlau. Tsis tas li ntawd, lub zog siab yeej ib txwm ua raws li cov roj ntsha hydrogen. Titanium thiab titanium alloys nyob rau hauv cov ntaub ntawv hlau muaj tsawg zog thiab muaj zog corrosion thiab muaj peev xwm txo qhov hnyav thiab ntim ntawm bipolar daim phiaj. Lub zog tshwj xeeb thiab ntim tshwj xeeb lub zog ntawm lub roj teeb tau txhim kho tau zoo, thiab cov khoom siv corrosion tsim los ntawm titanium thiab titanium alloys thaum lub sijhawm ua haujlwm mus ntev tsis muaj tshuaj lom rau proton pauv hom thiab catalysts, uas yog qhov tsim nyog rau kev txhim kho kev ruaj ntseg. thiab durability ntawm lub roj teeb ua haujlwm.
Cov hlau-carbon / nitride thiab amorphous carbon coatings npaj rau saum npoo ntawm titanium bipolar daim hlau muaj cov khoom zoo heev thiab muaj kev tshawb fawb siab thiab daim ntawv thov. Txawm li cas los xij, cov txheej txheem no ua rau muaj qhov tsis xws li pinhole, yog li lub hom phiaj tseem ceeb ntawm kev tshawb fawb tam sim no yog txhawm rau txhim kho Txheej compactness, zaj duab xis-puab daim ntawv cog lus lub zog, thiab txheej txheej txheej conductivity. Tsis tas li ntawd, cov txheej yuav tsum muaj hydrophobicity zoo los pab txhawb kev tawm ntawm cov dej uas tsim los ntawm cov tshuaj tiv thaiv.
Txhawm rau ua kom tau raws li cov khoom siv no, cov kev xav tau siab dua tau muab tso rau ntawm cov qauv tsim thiab kev koom ua ke ntawm txheej txheej. Kev sib xyaw thiab nano-cov qauv ntawm txheej txheej tuaj yeem txhim kho qhov ntom ntom, tiv thaiv corrosion, thiab hluav taws xob conductivity ntawm txheej txheej, thiab txhim kho cov kev pabcuam ruaj khov thiab kev ntseeg siab ntawm titanium phaj, uas yog lub ntsiab lus tseem ceeb ntawm kev txhim kho yav tom ntej.
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