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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

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

Revista

Título: Journal of Materials Science: Materials in Electronics

Vol. 31

Páginas: 3084-3091

ISSN: 0957-4522

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 34 Citações

Scopus - 35 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8