Txheej txheej txheej ntawm conductive thiab corrosion-resistant txheej nyob rau saum npoo ntawm titanium tuaj yeem tiv thaiv kev tsim cov oxide zaj duab xis rau saum npoo ntawm titanium bipolar phaj thiab ua tau raws li qhov yuav tsum tau ua ntawm cov phaj. Dhau li ntawm corrosion kuj thiab zoo heev hluav taws xob conductivity, lub txheej kuj xav tau kev sib raug zoo zog nrog lub matrix. Nyob rau tib lub sijhawm, vim tias qhov kub ntawm PEMFC yuav hloov pauv ntawm chav tsev kub thiab nyob ib puag ncig 80 C, nws yog ib qho tsim nyog uas cov txheej thiab cov khoom siv matrix muaj cov thermal expansion coefficients zoo sib xws kom tsis txhob delamination thiab tawg hauv cov txheej txheem kub hloov, yog li poob kev tiv thaiv. ntawm cov khoom.
Cov txheej txheem siv feem ntau tau muab faib ua ob pawg: hlau-raws li txheej (cov hlau tsis zoo, hlau-carbon / nitride) thiab cov txheej txheem carbon (graphite, conductive polymers, amorphous carbon, thiab lwm yam).
Kev ua tau zoo tsis sib txawv ntawm cov coated titanium bipolar daim hlau
Raws li ib feem tseem ceeb ntawm hydrogen roj cell, lub phaj bipolar plays lub luag hauj lwm txiav txim siab nyob rau hauv kev ua tau zoo, nqi, thiab durability ntawm tes. tus nqi thiab kav ntev yog ob qho teeb meem tseem ceeb txwv kev lag luam ntawm hydrogen roj hlwb. Tus nqi ntawm cov phaj bipolar nyob ntawm qee yam ntawm cov khoom siv ntawm cov phaj, ntws ua haujlwm, thiab cov txheej txheem ntawm cov phaj txheej.
Graphite thiab carbon matrix composites tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm hydrogen roj cell. Cov ntaub ntawv hlau tau dhau los ua cov ntaub ntawv tseem ceeb rau cov phaj bipolar ntawm hydrogen roj cell.in ntxiv rau, lub zog siab ib txwm yog lub hom phiaj ntawm hydrogen roj hlwb. titanium thiab titanium alloys hauv cov ntaub ntawv hlau muaj qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Lawv muaj kev tiv thaiv corrosion zoo heev hauv cov roj hydrogen thiab tuaj yeem txo qhov hnyav thiab ntim ntawm cov phaj bipolar, uas txhim kho qhov loj thiab ntim tshwj xeeb lub zog ntawm lub roj teeb. Tsis tas li ntawd, cov khoom siv corrosion ua los ntawm titanium thiab titanium alloys thaum lub sijhawm ua haujlwm ntev, tsis muaj tshuaj lom rau proton pauv hom thiab catalysts, uas yog qhov tsim nyog rau kev txhim kho kev ruaj ntseg thiab ua haujlwm ntawm lub roj teeb.
Hlau carbon / nitride thiab amorphous carbon coatings npaj rau saum npoo ntawm titanium bipolar daim hlau muaj cov khoom zoo tshaj plaws 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 luag. Yog li ntawd, lub hom phiaj tseem ceeb ntawm kev tshawb fawb tam sim no yog txhawm rau txhim kho lub compactness ntawm coatings, lub zog bonding ntawm zaj duab xis matrix, thiab nto conductivity ntawm coatings. Tsis tas li ntawd, cov txheej yuav tsum yog hydrophobic los pab txhawb kev tawm ntawm cov tshuaj tiv thaiv-tsim dej.
Txhawm rau ua kom tau raws li cov khoom siv dav dav no, cov kev xav tau siab dua tau muab tso rau pem hauv ntej rau kev tsim qauv thiab muaj pes tsawg leeg ntawm txheej txheej. Composite thiab nano-structure ntawm txheej tuaj yeem txhim kho lub compactness, corrosion resistance, thiab conductivity ntawm txheej rau ib yam dab tsi thiab txhim khu cov kev pab cuam stability thiab kev cia siab ntawm titanium phaj, uas yog lub ntsiab txoj kev loj hlob ntawm lub neej yav tom ntej.
