Investigation of Reducing Concentration Overvoltage toward Development of Low Pt-Loading PEFC

S. Takei, K. Uda, M. Nagayama, Kazunari Sasaki, A. Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

Membrane electrode assemblies (MEAs) with various catalyst-loading were made using a standard 46.5%Pt/KB (TEC10E50E) with the aim of developing low Pt-loading PEFCs. Since increase in concentration overvoltage for low catalyst-loading MEAs was observed, the mechanism of such increase in concentration overvoltage was considered, and then reducing concentration overvoltage was tried through two methods, by adding extra carbon and using a more hydrophobic carbon support, graphitized Ketjen black, within the cathode layer (CL). As a result, we have experimentally proven that increase in hydrophobicity of CL can promote water drain and reduce the concentration overvoltage for low catalyst-loading MEAs, and hydrophobicity is an important factor to be controlled within CL in addition to porosity.

Original languageEnglish
Article number124510
JournalJournal of the Electrochemical Society
Volume167
Issue number12
DOIs
Publication statusPublished - Jan 9 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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