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Orientador(es)
Resumo(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.
Descrição
Palavras-chave
Ion-selective Localized electrochemical techniques Charge-discharge mechanism Nickel-cobalt hydroxide electrodes Electrochemical energy storage
Contexto Educativo
Citação
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
Editora
IOP Publishing