Yuav ua li cas nrhiav tau electrode muaj peev xwm ntawm tooj liab?

Tooj liab yog ib qho tseem ceeb hlau rau ntau txhiab xyoo. Niaj hnub no nws tseem siv dav hauv ntau yam kev siv. Kab lus no yuav tshawb txog cov peev txheej electrode ntawm tooj liab kom meej.

Dab tsi yog electrode muaj peev xwm?

Lub peev xwm electrode yog qhov hluav taws xob uas tuaj yeem tau txais los ntawm cov khoom siv hluav taws xob hauv cov hluav taws xob hluav taws xob. Nws yog ib qho kev ntsuas ntawm qhov nyiam ntawm cov electrode kom nce lossis poob electrons thaum sib cuag nrog kev daws teeb meem.

Lub peev xwm electrode yog txiav txim siab los ntawm ntau yam, suav nrog cov concentration ntawm ions hauv kev daws, qhov kub thiab txias, thiab qhov xwm txheej ntawm cov khoom siv electrode nws tus kheej.

Tus txheej txheem electrode tej zaum, los yog E°, yog ib qho kev ntsuas ntawm electrode muaj peev xwm ntawm ib tug muab electrode thaum nws nyob rau hauv kev sib cuag nrog ib tug tov ntawm tus qauv tej yam kev mob. Cov txheej txheem txheej txheem yog txhais raws li qhov kub ntawm 25 ° C, lub siab ntawm 1 atm, thiab qhov concentration ntawm 1 M rau tag nrho cov ions hauv kev daws.

Tus txheej txheem electrode muaj peev xwm ntsuas tau siv cov khoom siv electrode, uas yog ib qho hluav taws xob uas muaj peev xwm paub thiab ruaj khov. Feem ntau siv siv electrode yog tus qauv hydrogen electrode (SHE).

Tus txheej txheem electrode muaj peev xwm yog ib qho kev ntsuas ntawm qhov nyiam ntawm cov khoom siv hluav taws xob rau qhov nce lossis poob electrons. Qhov zoo E° tus nqi qhia tau hais tias lub electrode muaj ib tug nyiam mus nce electrons, thaum tus nqi E° tsis zoo qhia tias cov electrode muaj ib tug nyiam poob electrons.

Tus txheej txheem electrode muaj peev xwm yog qhov tseem ceeb hauv electrochemistry, vim nws tuaj yeem siv los kwv yees cov kev taw qhia ntawm cov tshuaj tiv thaiv redox thiab suav cov Gibbs dawb lub zog hloov rau cov tshuaj tiv thaiv.

Electrode muaj peev xwm ntawm tooj liab

Lub peev xwm electrode ntawm tooj liab yog qhov ntsuas ntawm qhov nyiam ntawm tooj liab rau qhov nce lossis poob electrons thaum sib cuag nrog kev daws teeb meem. Tus qauv electrode muaj peev xwm ntawm tooj liab yog + 0.34 V, qhia tias tooj liab muaj lub siab xav tau electrons.

Cov electrode peev xwm ntawm tooj liab yog cuam tshuam los ntawm ntau yam, nrog rau cov concentration ntawm tooj liab ions nyob rau hauv kev daws, qhov kub thiab txias, thiab qhov xwm ntawm cov tshuaj nws tus kheej.

Lub peev xwm electrode ntawm tooj liab feem ntau yog siv hauv cov hluav taws xob hluav taws xob, xws li roj teeb thiab roj hlwb. Hauv cov hlwb no, tooj liab ua raws li cathode, qhov twg nws nce electrons thiab txo.

Cov electrode muaj peev xwm ntawm tooj liab kuj tseem ceeb hauv corrosion chemistry. Tooj liab yog cov hlau ruaj khov, tab sis nws tuaj yeem corrode thaum nws nyob rau hauv kev sib cuag nrog qee yam kev daws teeb meem, xws li dej ntsev. Kev xeb ntawm tooj liab yog cov txheej txheem electrochemical, qhov twg tooj liab poob electrons thiab oxidized.

Lub peev xwm electrode ntawm tooj liab tuaj yeem ntsuas tau siv lub potentiostat, uas yog ib qho cuab yeej uas tuaj yeem tswj thiab ntsuas lub peev xwm ntawm cov electrode hauv kev daws. Lub potentiostat txuas nrog cov khoom siv hluav taws xob, uas yog cov khoom siv hluav taws xob uas muaj peev xwm paub thiab ruaj khov.

Lub peev xwm electrode ntawm tooj liab kuj tuaj yeem ntsuas tau siv lub voltmeter. Nyob rau hauv txoj kev no, tooj liab electrode yog immersed nyob rau hauv ib tug tov ntawm tooj liab sulfate thiab txuas nrog ib tug voltmeter. Lub voltmeter ntsuas lub peev xwm ntawm tooj liab electrode nrog rau cov qauv hydrogen electrode.

Electrode muaj peev xwm ntawm tooj liab oxide

Lub peev xwm electrode ntawm tooj liab oxide yog ib qho kev ntsuas ntawm qhov nyiam ntawm tooj liab oxide mus rau qhov nce lossis poob hluav taws xob thaum sib cuag nrog kev daws teeb meem. Tus qauv electrode muaj peev xwm ntawm tooj liab oxide yog + 0.34 V, qhia tias tooj liab oxide muaj ib tug nyiam mus nce electrons.

Lub peev xwm electrode ntawm tooj liab oxide yog cuam tshuam los ntawm ntau yam, nrog rau cov concentration ntawm tooj liab ions hauv kev daws, qhov kub thiab txias, thiab qhov xwm ntawm cov tshuaj nws tus kheej.

Lub peev xwm electrode ntawm tooj liab oxide feem ntau yog siv hauv cov hluav taws xob hluav taws xob, xws li roj teeb thiab roj hlwb. Hauv cov hlwb no, tooj liab oxide ua raws li cathode, qhov twg nws tau txais electrons thiab txo.

Cov electrode muaj peev xwm ntawm tooj liab oxide kuj tseem ceeb hauv kev kho corrosion. Copper oxide yog ib qho chaw ruaj khov, tab sis nws tuaj yeem corrode thaum nws nyob rau hauv kev sib cuag nrog qee yam kev daws teeb meem, xws li dej ntsev. Kev xeb ntawm tooj liab oxide yog txheej txheem electrochemical, qhov twg tooj liab oxide poob electrons thiab oxidized.

Lub peev xwm electrode ntawm tooj liab oxide tuaj yeem ntsuas tau siv lub potentiostat, uas yog ib qho cuab yeej uas tuaj yeem tswj thiab ntsuas lub peev xwm ntawm cov electrode hauv kev daws. Lub potentiostat txuas nrog cov khoom siv hluav taws xob, uas yog cov khoom siv hluav taws xob uas muaj peev xwm paub thiab ruaj khov.

Lub peev xwm electrode ntawm tooj liab oxide kuj tuaj yeem ntsuas siv lub voltmeter. Nyob rau hauv txoj kev no, tooj liab oxide electrode yog immersed nyob rau hauv ib tug tov ntawm tooj liab sulfate thiab txuas nrog ib tug voltmeter. Lub voltmeter ntsuas lub peev xwm ntawm tooj liab oxide electrode nrog rau cov qauv hydrogen electrode.

Xaus

Cov electrode muaj peev xwm ntawm tooj liab yog ib qho kev ntsuas ntawm txoj kev nyiam ntawm tooj liab rau qhov nce lossis poob electrons thaum sib cuag nrog kev daws teeb meem. Tus qauv electrode muaj peev xwm ntawm tooj liab yog + 0.34 V, qhia tias tooj liab muaj lub siab xav tau electrons.

Cov electrode muaj peev xwm ntawm tooj liab cuam tshuam los ntawm ntau yam, nrog rau cov concentration ntawm tooj liab ions hauv kev daws, qhov kub thiab txias, thiab qhov xwm txheej ntawm cov tshuaj nws tus kheej.

Lub peev xwm electrode ntawm tooj liab yog qhov tseem ceeb hauv electrochemistry, vim nws tuaj yeem siv los kwv yees cov kev taw qhia ntawm cov tshuaj tiv thaiv redox thiab suav cov Gibbs dawb lub zog hloov pauv rau cov tshuaj tiv thaiv.