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

Adán-Más, Alberto; Taryba, Maryna; Moura E Silva, Teresa; Guerlou-Demourgues, Liliane; Montemor, M.F.

http://hdl.handle.net/10400.21/11513

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Authors

Adán-Más, Alberto

Taryba, Maryna

Moura E Silva, Teresa

Guerlou-Demourgues, Liliane

Montemor, M.F.

Abstract(s)

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.

Keywords

Ion-selective Localized electrochemical techniques Charge-discharge mechanism Nickel-cobalt hydroxide electrodes Electrochemical energy storage

URI

http://hdl.handle.net/10400.21/11513

Citation

ADÁN-MÁS, Alberto; [et al] – In-situ localized pH, pNa and dissolved O2 measurements during charge-discharge of mixed Ni–Co hydroxide electrodes. Journal of The Electrochemical Society. ISSN 0013-4651. Vol. 167, N.º 8 (2020), pp. 1-9