Electrochemical behavior of Ni particles modified polypyrrole films studied by EQCN technique

Author(s)

Bergamaski, F. O. F. ^[1] ; Santos, M. C. ^[2] ; Nascente, P. A. P. ; Bulhões, L. O. S. ; Pereira, E. C. ^[5]

Affiliation

^[1] Universidade Federal de São Carlos (UFSCAR). Centro de Ciências Exatas e de Tecnologia - Brasil

^[2] Universidade Estadual Paulista (UNESP). Campus de Araraquara. Instituto de Química - Brasil

^[5] Universidade Federal de São Carlos (UFSCAR). Centro de Ciências Exatas e de Tecnologia - Brasil

• Document type: Journal article
• Source: Journal of Electroanalytical Chemistry; v. 583, n. 1, p. 162-166, Sept. 2005.
• Field of knowledge: Physical Sciences and Mathematics - Chemistry

Abstract

Polypyrrole films modified with Ni Particles were eletrodeposited using a constant potential on a Pt/quartz crystal electrode with the aim to investigate the changes in the voltammetric and mass profiles compared with pure polypyrrole. The electrochemical behavior of the polypyrrole with Ni showed a new cathodic peak at -0.73 V associated to Ni2+ reduction. Besides, it was characterized that there is a redox-pair of the polymer and Ni and a model was proposed to explain the phenomenon considering the eletroneutrality principle. The transport of the ClO-4 ion into (or outside) the polymer is opposite to the expected direction. This occurs due to the redox-pair between the PPy chain and Ni species which can be explained by a loss of anions during Ni oxidation and the gain of anions during the Ni reduction. (AU)

• FAPESP's process: 03/09933-8 - Center for Excellence in Electrochemically Synthesized Nanostructures
• Grantee: Ernesto Chaves Pereira de Souza
• Support Opportunities: PRONEX Research - Thematic Grants