Hydrogen and oxygen plasma enhancement in the Cu electrodeposition and consolidation processes on BDD electrode applied to nitrate reduction

Autor(es)

Couto, A. B. ^[1] ; Santos, L. C. D. ^[1] ; Matsushima, J. T. ^[1] ; Baldan, M. R. ^[1] ; Ferreira, N. G. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, BR-12201 Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 257, n. 23, p. 10141-10146, SEP 15 2011.
• Citações Web of Science: 9

Resumo

Copper nanoparticle electrodeposition and consolidation processes were studied on boron doped diamond (BDD) electrode submitted to hydrogen and oxygen plasma treatments. The modified BDD films were applied as electrodes for nitrate electroreduction. The results showed that both treatments have a strong influence on the copper deposition and dissolution processes. For BDD treated with hydrogen plasma the copper electrodeposit was homogeneous with high particle density. This behavior was attributed to the BDD surface hydrogenation that improved its conductivity. On the other hand, the treatment with oxygen plasma was important for the copper nanoparticle consolidation on BDD surface, confirmed by the result's reproducibility for nitrate reduction. This performance may be associated with the formation of oxygen groups that can act as anchor points for Cu-clusters, enhancing the interfacial adhesion between diamond and the metal coating. The best electrochemical nitrate reduction response was obtained in acid media, where occurred the separation of the nitrate reduction process and the water reduction reaction. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/05391-0 - Consolidação de nanopartículas de cobre em fibras de carbono e diamante para aplicação como sensor de íons nitrato em águas residuais.
• Beneficiário: Andréa Boldarini Couto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado