Ni-co alloys electrodeposited in stainless steel for supercapacitors electrodes

• Autor(a) principal: Silva,R. P.
• Data de Publicação: 2013
• Outros Autores: Eugénio,S., Silva,T. M., Carmezim,M. J., Montemor,M. F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-11642013000200001
• topic: Supercapacitors; Electrodeposition; Ni-Co Alloys; Specific Capacitance; Dendritic Structure

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.