Copper/Carbon/PTFE Oxygen-Depolarized Cathodes for Chlor-alkali Membrane Cells

Copper/Carbon/PTFE Oxygen-Depolarized Cathodes for Chlor-alkali Membrane Cells

Autor Figueiredo, Raul S. Google Scholar
Bertazzoli, Rodnei Google Scholar
Rodrigues, Christiane A. Autor UNIFESP Google Scholar
Instituição Universidade Estadual de Campinas (UNICAMP)
Universidade Federal de São Paulo (UNIFESP)
Resumo Chlor-alkali electrolysis continues to pose challenges for researchers. Replacement of the hydrogen-evolution reaction by the oxygen-reduction reaction can reduce the overpotential of the cathodic process, depolarizing the overall reaction and saving energy. Here, we describe a series of experiments to determine the cell voltage and energy savings when a copper-doped carbon/polytetrafluoroethylene (PTFE) oxygen-diffusion cathode is used in brine electrolysis experiments, instead of a hydrogen-evolving graphite cathode. Voltammetric studies were carried out to determine the ideal oxygen flow rate through the porous cathode structure and the amount of copper that maximizes oxygen-reduction current densities. Brine electrolysis was performed in a two-compartment membrane cell using a TiO2/RuO2 anode. Our findings indicate a strong depolarizing effect with the copper-doped oxygen-diffusion cathode. Comparison of the results using a graphite (hydrogen-evolving) cathode and a copper-doped cathode at 70 degrees C showed that the latter resulted in 42% reduction in energy demand.
Idioma Inglês
Data de publicação 2013-04-24
Publicado em Industrial & Engineering Chemistry Research. Washington: Amer Chemical Soc, v. 52, n. 16, p. 5611-5615, 2013.
ISSN 0888-5885 (Sherpa/Romeo, fator de impacto)
Publicador Amer Chemical Soc
Extensão 5611-5615
Fonte http://dx.doi.org/10.1021/ie303484d
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000318204900013
Endereço permanente http://repositorio.unifesp.br/handle/11600/36219

Exibir registro completo




Arquivo

Arquivo Tamanho Formato Visualização

Não existem arquivos associados a este item.

Este item está nas seguintes coleções

Buscar


Navegar

Minha conta