Electrochemical cell design for the impedance studies of chlorine evolution at DSA® anodes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

J. F. Silva (Autor) Outra; A. C. Dias (Autor) Outra; P. Araújo (Autor) Outra; C. M. A. Brett (Autor) Outra; A. Mendes (Autor) FEUP

Revista

Título: Review of Scientific Instruments

Vol. 87 Nº 8

Páginas: 085113-1-085113-8

ISSN: 0034-6748

Editora: American Institute of Physics

Indexação

ISI Web of Knowledge - 0 Citações

ISI Web of Science

Scopus - 1 Citação

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas

Projetos Associados

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Outras Informações

ID Authenticus: P-00K-S45

DOI: 10.1063/1.4959097

Abstract (EN): A new electrochemical cell design suitable for the electrochemical impedance spectroscopy (EIS) studies of chlorine evolution on Dimensionally Stable Anodes (DSA®) has been developed. Despite being considered a powerful tool, EIS has rarely been used to study the kinetics of chlorine evolution at DSA anodes. Cell designs in the open literature are unsuitable for the EIS analysis at high DSA anode current densities for chlorine evolution because they allow gas accumulation at the electrode surface. Using the new cell, the impedance spectra of the DSA anode during chlorine evolution at high sodium chloride concentration (5 mol dm−3 NaCl) and high current densities (up to 140 mA cm−2 ) were recorded. Additionally, polarization curves and voltammograms were obtained showing little or no noise. EIS and polarization curves evidence the role of the adsorption step in the chlorine evolution reaction, compatible with the Volmer-Heyrovsky and Volmer-Tafel mechanisms.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8