Hauv cov pa roj, diffusion electrode yog ib hom electrode siv hauv cov tshuaj tiv thaiv electrochemical. Nws yog feem ntau ua haujlwm nyob rau hauv cov khoom siv xws li roj diffusion hlwb, roj hlwb, thiab qee cov sensors.
Lub hom phiaj tsim ntawm diffusion electrode yog los muab kev sib txuas ntawm cov pa roj thiab cov electrolyte, ua kom cov roj molecules tuaj yeem cuam tshuam nrog ions hauv electrolyte. Nws feem ntau yog ua los ntawm cov khoom siv catalytic, nrog cov catalysts xws li platinum, palladium, thiab platinum-palladium alloys. Cov catalysts pab txhawb cov tshuaj electrochemical ntawm cov roj molecules, txhim kho cov tshuaj tiv thaiv.
Cov qauv ntawm diffusion electrode feem ntau yog ntxeem tau, tso cai rau cov roj nkag mus rau hauv electrode thiab tuaj rau hauv kev sib cuag nrog cov khoom catalytic. Cov qauv ntxeem tau kuj pab ua kom thaj chaw saum npoo ntawm cov electrode, txhim kho cov tshuaj tiv thaiv. Tsis tas li ntawd, cov electrode yuav tsum tau ua kom pom qhov zoo conductivity kom ntseeg tau tias cov dej ntws ntws los ntawm cov electrolyte.
Platinum txheej Porous titanium phaj
Nyob rau hauv electrolysis, nws yog ib qho nyuaj rau coated nto ntawm titanium hmoov phaj nrog ib txheej ntawm platinum txheej los txhim kho cov catalytic zog ntawm titanium rau roj diffusion electrode daim ntaub ntawv. Cov txheej no muab cov kev ua haujlwm catalytic thiab ruaj khov ntawm platinum thaum leveraging corrosion kuj thiab conductivity ntawm titanium.
Cov txheej txheem ntawm txheej txheej platinum feem ntau ua tiav los ntawm cov txheej txheem xws li kev txo cov tshuaj lom neeg, lub cev vapor deposition, lossis electrochemical deposition. Thaum lub sijhawm txheej txheem no, cov khoom siv platinum tau muab tso rau saum npoo ntawm titanium hmoov phaj hauv ib txheej nyias thiab zoo ib yam.
Lub platinum txheej no tuaj yeem muab kev ua kom zoo dua catalytic, txhawb kev cuam tshuam ntawm cov roj molecules thiab ions hauv electrolyte. Nws tuaj yeem ua rau cov tshuaj tiv thaiv thiab kev ua haujlwm ntawm cov roj diffusion electrode, txhim kho kev ua haujlwm ntawm electrochemical.
Nyob rau hauv cov roj diffusion hlwb, diffusion electrode feem ntau yog ua ke nrog lwm cov electrode (feem ntau yog ib qho oxide electrode) los tsim hluav taws xob hluav taws xob los ntawm cov roj diffusion thiab cov tshuaj tiv thaiv. Hauv cov roj hlwb, diffusion electrodes catalyze cov oxidation ntawm hydrogen gas lossis lwm yam roj, ua hluav taws xob tam sim no. Nyob rau hauv cov sensors, diffusion electrodes yog siv los ntsuas cov roj concentration los yog ntes cov khoom tshwj xeeb ntawm cov roj.
Nyob rau hauv xaus, ib tug diffusion electrode nyob rau hauv gases yog ib tug electrode siv rau electrochemical tshua muaj gases. Nws pab txhawb kev cuam tshuam ntawm cov roj molecules thiab ions hauv electrolyte, ua lub luag haujlwm tseem ceeb hauv cov khoom siv xws li roj diffusion hlwb, roj hlwb, thiab cov sensors.
