ADÁN-MÁS, Alberto; TARYBA, Maryna; SILVA, Teresa; GUERLOU-DEMOURGUES, Liliane; MONTEMOR, Maria

doi:10.1149/1945-7111/ab8924

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ADÁN-MÁS, Alberto
Centro de Quimica Estrutural [CQE]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

TARYBA, Maryna
Centro de Quimica Estrutural [CQE]

SILVA, Teresa
Instituto Superior de Engenharia de Lisboa [ISEL]
Centro de Quimica Estrutural [CQE]

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Journal of The Electrochemical Society. 2020, vol. 167, n° 8, p. 080511

Electrochemical Society

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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 Na2SO4 0.05 M by localized in situ measurements of pH, pNa and dissolved O2 during cyclic voltammetry. Local pH and pNa distributions were recorded using micro-potentiometric sensors with liquid membrane, while dissolved O2 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.< Réduire

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In-situ localized pH, pNa and dissolved O2 measurements during charge-discharge of mixed Ni–Co hydroxide electrodes

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