Electrochemical Cell vs Electrolytic Cell
Hauv electro chemistry oxidation, txo cov tshuaj tiv thaiv ua lub luag haujlwm tseem ceeb. Nyob rau hauv ib qho oxidation txo cov tshuaj tiv thaiv, electrons hloov los ntawm ib tug reactant mus rau lwm tus. Cov khoom uas lees txais electrons yog lub npe hu ua tus neeg sawv cev txo qis, qhov twg cov khoom uas muab cov hluav taws xob tam sim no hu ua oxidizing tus neeg sawv cev. Tus neeg sawv cev txo qis yog lub luag haujlwm txo qis lwm cov reactant thaum tab tom oxidation nws tus kheej. Thiab rau oxidizing tus neeg sawv cev, nws yog vice versa. Cov tshuaj tiv thaiv no tuaj yeem muab faib ua ob qhov kev tawm tsam ib nrab, kom pom cov oxidation cais thiab txo qis; Yog li, nws qhia cov naj npawb ntawm cov electrons txav hauv lossis tawm.
Electrochemical Cells
Electrochemical cell yog ib qho kev sib xyaw ua ke ntawm kev txo qis thiab oxidizing tus neeg sawv cev, uas yog lub cev sib cais ntawm ib leeg. Feem ntau kev sib cais yog ua los ntawm tus choj ntsev. Txawm hais tias lawv yog lub cev sib cais, ob qho tib si ib nrab ntawm cov hlwb yog nyob rau hauv kev sib cuag nrog ib leeg. Electrolytic thiab galvanic hlwb yog ob hom electrochemical hlwb. Hauv ob qho tib si electrolytic thiab galvanic hlwb, oxidation-txo cov tshuaj tiv thaiv yog tshwm sim. Yog li ntawd, nyob rau hauv ib tug electrochemical cell, muaj ob electrodes hu ua anode thiab cathode. Ob lub electrodes yog sab nraud txuas nrog lub siab tiv thaiv voltmeter; Yog li ntawd, tam sim no yuav tsis kis ntawm cov electrodes. Qhov voltmeter no yuav pab tswj tau qee qhov hluav taws xob ntawm cov electrodes qhov twg oxidation tshwm sim. Cov tshuaj tiv thaiv oxidation tshwm sim ntawm qhov anode, thiab qhov txo qis tshwm sim tshwm sim ntawm cathode. Electrodes yog immersed nyob rau hauv cais electrolyte daws. Feem ntau, cov kev daws teeb meem no yog cov kev daws teeb meem ionic ntsig txog hom electrode. Piv txwv li, tooj liab electrodes yog immersed nyob rau hauv tooj liab sulfate tov thiab nyiaj electrodes yog immersed nyob rau hauv silver chloride tov. Cov kev daws teeb meem no txawv; yog li ntawd, lawv yuav tsum sib cais. Txoj kev uas feem ntau cais lawv yog tus choj ntsev. Nyob rau hauv ib qho hluav taws xob hluav taws xob, lub zog ntawm lub xov tooj ntawm tes tau hloov mus rau ib qho hluav taws xob tam sim no, uas peb tuaj yeem siv los teeb lub teeb, lossis ua lwm yam hluav taws xob ua haujlwm.
Electrolytic Cells
Qhov no yog lub xovtooj ntawm tes, uas siv cov hluav taws xob tam sim no los rhuav tshem cov tshuaj lom neeg, lossis ua lwm yam lus, los ua electrolysis. Yog li ntawd, electrolytic hlwb xav tau ib qho chaw sab nraud ntawm hluav taws xob rau kev ua haujlwm. Piv txwv li, yog tias peb muab tooj liab thiab nyiaj los ua ob lub electrodes hauv lub xov tooj ntawm tes, nyiaj yog txuas nrog lub davhlau ya nyob twg zoo ntawm lub zog sab nraud (lub roj teeb). Tooj liab txuas nrog rau lub davhlau ya nyob twg tsis zoo. Txij li thaum lub davhlau ya nyob twg tsis zoo yog electron nplua nuj, electrons ntws los ntawm qhov ntawd mus rau tooj liab electrode. Yog li ntawd tooj liab txo. Ntawm cov nyiaj electrode, cov tshuaj tiv thaiv oxidation tshwm sim, thiab cov hluav taws xob tso tawm tau muab rau lub tshuab hluav taws xob tsis zoo ntawm lub roj teeb. Hauv qab no yog tag nrho cov tshuaj tiv thaiv nyob rau hauv ib tug electrolytic cell, uas muaj tooj liab thiab nyiaj electrodes.
2Ag(s)+ Cu2+ (aq)⇌2 Ag+ (aq)+ Cu(s)
Qhov txawv ntawm electrochemical cell thiab electrolytic cell yog dab tsi?
• Electrolytic cell yog hom electrochemical cell.
• Electrolytic cells xav tau tam sim no sab nraud rau kev ua haujlwm. Tab sis ib qho hluav taws xob hluav taws xob, lub peev xwm ntawm lub xov tooj ntawm tes hloov mus rau hluav taws xob tam sim no. Yog li ntawd, nyob rau hauv ib tug electrolytic cell, cov txheej txheem ntawm cov electrodes yog tsis spontaneous.
• Hauv ib lub xovtooj ntawm electrochemical, lub cathode yog qhov zoo, thiab cov anode tsis zoo. Hauv lub cell electrolytic, lub cathode tsis zoo, thiab cov anode yog qhov zoo.
