Electrochemical synthesis of gamma-CoOOH films from alpha-Co(OH)(2) with a high electrochemical performance for energy storage device applications

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Aguilera, L (Author) Other; Aguiar, PCM (Author) Other; Ruiz, YL (Author) Other; Almeida, A (Author) Other; Agostinho Moreira, JA (Author) FCUP; Passos, RR (Author) Other; Pocrifka, LA (Author) Other

Journal

Title: Journal of Materials Science: Materials in Electronics

Vol. 31

Pages: 3084-3091

ISSN: 0957-4522

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 34 Citations

Scopus - 35 Citations

Other information

Authenticus ID: P-00R-MF1

DOI: 10.1007/s10854-019-02853-1

Abstract (EN): In this work, gamma-CoOOH was successfully synthesized from alpha-Co(OH)(2), as a precursor, by electrochemical oxidation, without the use of any additives or high temperatures. The films were morphologically and structurally characterized using X-Ray Diffraction and Scanning Electronic Microscopy techniques. Cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques were used for the electrochemical characterization. The XRD and Raman techniques allowed confirming the effective conversion of alpha-Co(OH)(2) to gamma-CoOOH. The gamma-CoOOH films are composed of hexagonal platelets on a steel plate substrate. The deposited films exhibit excellent electrochemical performance at different current densities, and good cycling stability of 95.1% after 2000 cycles of charge/discharge. The maximum specific capacity of 89.3 mA h g(-1) was achieved at a current density of 1 mA g(-1). The results suggest a simple route to synthesize gamma-CoOOH films, which are promising as an electrode material for application in energy storage devices.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8