Yog vim li cas rau polarization ntawm electroplated electrodes nyob rau hauv hluav taws xob cua sov raj

Yog vim li cas rau polarization ntawm electroplated electrodes nyob rau hauv hluav taws xob cua sov raj

Lub npe hu ua polarization yog hais txog qhov tshwm sim uas lub peev xwm electrode deviates los ntawm nws cov peev xwm sib npaug thaum tam sim no dhau los ntawm electrode. Cathode polarization ua rau cathode electrode muaj peev xwm hloov mus rau qhov tsis zoo; Anodic polarization ua rau muaj peev xwm hloov mus rau qhov zoo. Qhov ntau dua qhov ceev tam sim no los ntawm cov electrode dhau, qhov ntau dua tus nqi ntawm cov electrode muaj peev xwm sib txawv los ntawm qhov sib npaug electrode muaj peev xwm. Tus nqi sib txawv tuaj yeem qhia tau tias yog overpotential lossis overpotential △ Δ. Feem ntau, overpotential yog qhia raws li tus nqi zoo, yog li cathode overpotential thiab anode overpotential.

Yog vim li cas rau polarization ntawm electrode thaum energized yog vim qhov qeeb ceev ntawm qee cov kauj ruam hauv cov txheej txheem electrode. Noj cov txheej txheem cathodic cov tshuaj tiv thaiv ntawm cov hlau ions txo cov hlau ntawm electrodes ua piv txwv, cov txheej txheem tshuaj tiv thaiv suav nrog peb cov kauj ruam sib law liag:

① Hlau hydration ions txav los ntawm sab hauv cov tshuaj mus rau cathode interface - cov kauj ruam hloov ntawm cov khoom nyob rau hauv cov kua theem;

② Hlau ions tau electrons ntawm cathode thiab interface, txo lawv mus rau hlau atoms - electrochemical kauj ruam;

③ Ib qho siv lead ua hlau nrog hlau atoms tau teem rau hauv ib qho kev teeb tsa - cov kauj ruam ntawm kev tsim cov theem tshiab.

Peb cov kauj ruam no txuas ntxiv mus, tab sis qhov ceev ntawm txhua kauj ruam yog sib txawv, yog li qhov ceev ntawm tag nrho cov tshuaj tiv thaiv electrode yog tswj los ntawm cov kauj ruam qeeb.

Lub polarization tshwm sim los ntawm diffusion tus nqi ntawm reactants los yog cov tshuaj tiv thaiv cov khoom nyob ze ntawm lub electrode nto yog tsawg tshaj li cov tshuaj tiv thaiv electrochemical yog hu ua concentration polarization. Lub polarization tshwm sim los ntawm electrochemical cov tshuaj tiv thaiv ceev ntawm cov electrode yog tsawg tshaj li cov electron motion ceev nyob rau hauv sab nraud Circuit Court yog hu ua electrochemical polarization los yog activation polarization.

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