Qhov tsawg kawg nkaus thickness ntawmtitanium fiber ntauyog 0.25mm, lub porosity yog 50-70%, thiab cov qauv yog ntau conducive rau roj-kua huab hwm coj hloov. Yuav kom tswj tau nws cov conductivity, platinum thiab iridium yuav tsum tau plated rau saum npoo. Muaj teeb meem xws li cov hlau muaj nuj nqis loj thiab cov nqi siab; muaj teeb meem xws li txheej txheej tsis zoo thiab ua rau cov txheej txheem anode catalyst.
(1) Thaum siv titanium sintered xav li roj cell diffusion txheej, carbon fiber yog yooj yim corroded;
(2) Titanium sintered muaj txheej txheej txheej muaj xws li txheej txheej-ci thiab mem tes electroplating;
1. Titanium hnov anode gas diffusion txheej
Sintered titanium xav tau yog siv los ua lub substrate rau platinum catalyst deposition. Cov qauv siv yog puag ncig, 30mm inch, 1mm tuab, thiab muaj qhov porosity ntau dua 70%. Cov txheej txheem ua haujlwm tshwj xeeb yog raws li hauv qab no:
(1) Deoxidation zaj duab xis: Titanium muaj nyob rau hauv cov tshuaj electrolytic pickling raws li nitric acid thiab hydrofluoric acid nrog pH ntawm 0.5 ntawm chav tsev kub; Tom qab ntawd ib qho hluav taws xob ntawm 2.5V yog siv rau qhov xav kom ua rau anodic dissolution ntawm titanium / titanium dioxide nto. Titanium nthuav dav mesh plated nrog platinum raws li cov txee electrodes tau siv rau lub hom phiaj no ua cov kauj ruam npaj.
(2) Argon tu: Tom qab yaug nrog dej deionized, titanium workpiece nto tau raug kho plasma hauv argon kom tshem tawm cov kab mob tseem tshuav ntawm titanium nto.
(3) Plating: Ua raws li cov txheej txheem tu lub cev tsis tu ncua thiab ntxuav ntxiv nrog dej deionized, titanium fibers tau tam sim electrochemically plated nrog platinum hauv qab argon. Thaum lub sij hawm electroplating txheej txheem, lub titanium electrode tau muab tso rau ntawm ob qho tib si counter electrodes. Tom qab ntawd, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau micro- thiab nano-loj platinum hais rau ntawm thaj chaw saum npoo, hom electroplating tau hloov mus rau pulse electroplating ntawm lub txee electrode ntawm cathode voltage ntawm -3. 0 V tsis cuam tshuam cov txheej txheem. Lub sijhawm teem sijhawm rau 10 ms thiab lub sijhawm tawm mus rau 56.7 ms, ua rau lub luag haujlwm ntawm 15%. Qhov thib ob ntawm cov txheej txheem electroplating tau ua rau lwm 10 feeb.
(4) MEA sib dhos: Cov electrodes tau impregnated nrog 0.5 ml Nafion® proton conducting ionomer tov (5 wt.% hauv ethanol) thiab tom qab ntawd plated nrog platinum. Cov tshuaj tau siv los ntawm kev txhuam hniav, thaum lub titanium-raws li electrodes txuas nrog cov khoom siv ua kom sov. Cov huab cua kub yog teem rau 60 degree kom ceev cov evaporation ntawm ethanol los ntawm electrode nto.
(5) thiab daim hlau bipolar tsim ib pawg, 20 pawg.
2. Platinum txheej ntawm titanium xav
Cov micrographs hauv qab no qhia sintered titanium fibers nrog platinum txheej. Cov fibers nyob rau sab nraud ntawm qhov xav tau tiv thaiv tag nrho cov txheej txheem, ib qho txiaj ntsig uas tuaj yeem piav qhia los ntawm kev faib hluav taws xob hauv lub xov tooj ntawm tes galvanic (cov electrode ua haujlwm nyob nruab nrab ntawm thiab sib npaug rau ob lub txee electrodes). Lub txheej yog txaus los tso cai rau lub sij hawm ntev ruaj khov adhesion ntawm platinum nanoparticles.
Tiv tauj peb kom paub ntau ntxiv. Ua tsaug
Nicole
Lub tuam txhab: Baoji Jimiyun Dynamic Co., Ltd
Lub teb chaws: Suav teb
Ntxiv: Baoti txoj kev, Jintai, Baoji nroog, Shaanxi, Suav teb
Cel: +86 13369210920
Gmail:nicole@jmyunti.com
Lub Vev Xaib: www.jm-titanium.com
