In-Situ Localized pH, pNa and Dissolved O 2 Measurements During Charge-Discharge of Mixed Ni–Co Hydroxide Electrodes

This work reports, for the first time, the use of ion-selective localized electrochemical techniques to elucidate the charge-discharge mechanism of nickel-cobalt hydroxide electrodes for electrochemical energy storage. The charge-discharge mechanism of electrodeposited nickel-cobalt hydroxide electr...

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Published inJournal of the Electrochemical Society Vol. 167; no. 8; p. 80511
Main Authors Adán-Más, Alberto, Taryba, Maryna G., Silva, Teresa M., Guerlou-Demourgues, Liliane, Montemor, M. F.
Format Journal Article
LanguageEnglish
Published 23.04.2020
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Summary:This work reports, for the first time, the use of ion-selective localized electrochemical techniques to elucidate the charge-discharge mechanism of nickel-cobalt hydroxide electrodes for electrochemical energy storage. The charge-discharge mechanism of electrodeposited nickel-cobalt hydroxide electrodes was studied in Na 2 SO 4 0.05 M by localized in situ measurements of pH, pNa and dissolved O 2 during cyclic voltammetry. Local pH and pNa distributions were recorded using micro-potentiometric sensors with liquid membrane, while dissolved O 2 was monitored using a fiber-optic microsensor. These original results highlight how localized potentiometry can provide new insights to better understand the charge mechanism of metal (hydr)oxide electrodes by directly measuring the concentrations/activities of relevant species at the electrode-electrolyte interface during charge-discharge.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ab8924