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Corrosão e Protecção de Materiais

versão On-line ISSN 2182-6587

Resumo

SILVA, R. P. et al. Ni-co alloys electrodeposited in stainless steel for supercapacitors electrodes. Corros. Prot. Mater. [online]. 2013, vol.32, n.2, pp.37-41. ISSN 2182-6587.

The development of electric energy storage devices with high power density has become one of the most challenging research areas in a wide range of applications. In this context, electrochemical supercapacitors are attracting great attention due to their high potential density, fast charge-discharge cycles and high number of life cycles. In the present work, Ni-Co nanostructured films were produced by electrodeposition technique in order to form a porous dendritic structure with enhanced surface area. The electrochemical behaviour of the deposited films was studied by charge-discharge experiments. The Ni-Co dendritic films electrodeposited at current densities i1 = -4 mA cm-2 and i2 = -30 mA cm-2 display a specific capacitance of 215 F g-1. The capacitance loss is about 33 % after 6000 charge-discharge cycles.

Palavras-chave : Supercapacitors; Electrodeposition; Ni-Co Alloys; Specific Capacitance; Dendritic Structure.

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