Electrochemical preparation of Ni(OH)2/CoOOH bilayer films for application in energy storage devices

CoOOH/Ni(OH)2 and Ni(OH)2/CoOOH bilayer films were obtained through electrochemical deposition of Ni(OH)2 and Co(OH)2 single layers onto steel plate substrate, with subsequent electrochemical oxidation of Co(OH)2 to form CoOOH. The films were structurally characterized using X-ray diffraction and Ra...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-09, Vol.874, p.159858, Article 159858
Main Authors: Aguilera, L., Leyet, Y., Almeida, A., Moreira, J. Agostinho, de la Cruz, J. Pérez, Milán-Garcés, Erix A., Passos, R.R., Pocrifka, L.A.
Format: Article
Language:English
Subjects:
Bilayer films
Cobalt oxyhydroxide
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemical oxidation
Electrodeposition
Energy storage
Nickel compounds
Nickel hydroxide
Oxidation
Raman spectroscopy
Relaxation time
Spectrum analysis
Steel plates
Substrates
Time constant
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Summary:CoOOH/Ni(OH)2 and Ni(OH)2/CoOOH bilayer films were obtained through electrochemical deposition of Ni(OH)2 and Co(OH)2 single layers onto steel plate substrate, with subsequent electrochemical oxidation of Co(OH)2 to form CoOOH. The films were structurally characterized using X-ray diffraction and Raman spectroscopy techniques. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques were used to perform the electrochemical characterization of the prepared bilayers. It was verified that during the electrochemical oxidation, CoOOH formation occurs without Ni(OH)2 oxidation. Ni(OH)2 films deposited on CoOOH (CoOOH/Ni(OH)2) showed a superior electrochemical performance, with 324.27 mA h g−1 and 96.82% at 1.0 mA cm−2 for the specific capacity and capacity retention respectively. It was also determined that the relaxation time constant under this condition is 17.05 s. These results suggested that the CoOOH/Ni(OH)2 bilayer films might be potential candidates for application as electrode in energy storage devices. •The preparation and electrochemical characterization of CoOOH/Ni(OH)2 and Ni(OH)2/CoOOH bilayer films is report.•The CoOOH layer in the CoOOH/Ni(OH)2 bilayer films result in a better electrochemical performance.•The relaxation time constant under this condition was 17.05 s•The CoOOH/Ni(OH)2 bilayer films might be a potential candidate for electrode applications.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.159858