Structural optimization of gas diffusion electrodes loaded with LaMnO 3 electrocatalysts

Masayoshi Yuasa, Akiko Koga, Tetsuya Kida, Kengo Shimanoe, Noboru Yamazoe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, gas diffusion electrodes (GDEs) with two catalyst layers were fabricated and tested for their electrode performance for oxygen reduction in an alkaline solution. The LaMnO3/carbon black catalyst layers were fabricated using a reverse micelle method to finely disperse the LaMnO 3 particles onto the carbon matrices, for which commercial Ketjen Black (KB) (1270 m2 g-1) and Vulcan XC-72R (VX) (254 m2 g-1) were used. The three-layer-structured GDE with the two LaMnO3/KB and LaMnO3/VX catalyst layers exhibited a superior oxygen reduction activity when compared to that of a conventional GDE with only one LaMnO3/KB catalyst layer. Pore size distribution and gas permeability measurements revealed that the LaMnO3/VX layer was more porous and had higher gas permeability than the LaMnO3/KB layer. These results suggest that the intermediate layer of LaMnO3/VX can efficiently supply oxygen to reaction sites dispersed in the LaMnO 3/KB and LaMnO3/VX catalyst layers, which consequently leads to an improvement in the electrode performance.

Original languageEnglish
Pages (from-to)675-681
Number of pages7
JournalJournal of Applied Electrochemistry
Volume40
Issue number3
DOIs
Publication statusPublished - Mar 1 2010

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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