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Nano- and micrometric approaches to cobalt electrodeposition on carbon substrates

1997; Elsevier BV; Volume: 422; Issue: 1-2 Linguagem: Inglês

10.1016/s0022-0728(96)04899-1

1873-2569

Elvira Gómez, Marı́a del Carmen Marı́n, F. Sanz, E. Vallés,

Nanoporous metals and alloys

The first stages of electrodeposition of cobalt on different carbon substrates are studied at different [Cl−]/[Co(II)] ratios by Tapping mode atomic force microscopy, scanning electron microscopy and electrochemical analysis. Two charge deposition ranges are considered, ensuring that nano- and micrometric levels are attained. At the nanometric scale, a gradual increase in the number of nuclei over time is observed but, below a critical value, aggregation of the nuclei occurs. A high chloride concentration in solution favours the nucleation, promoting flat nuclei and star-shaped deposits. The species responsible for this behaviour are proposed to be chloro-cobalt complexes that adsorb on the crystallites, hindering the growth in some directions.