Highly platinum-loaded Magnéli phase titanium oxides as a high voltage tolerant electrocatalyst for polymer electrolyte fuel cells

Didem C. Dogan, Sun Mi Hwang, Eun Hwa Jang, Sung Dae Yim, Young Jun Sohn, Sung Hyun Kim, Tae Hyun Yang, Gu Gon Park

Research output: Contribution to journalArticle

Abstract

Magnéli phase titanium oxides (MPTOs), possess high electrical conductivity and chemical stability, are promising support materials for the development of novel electrocatalyst in polymer electrolyte fuel cells (PEFCs). Despite MPTO's extremely low specific surface area (1 m2/g or less), high Pt loading (40 wt%) and excellent Pt particle-size distribution were obtained by the modified borohydride method. The reasons were discussed and compared with polyol method. Membrane electrode assembly (MEA) performance of those Pt/MPTO catalysts were found to be 169.7 and 366.2 mA/cm2 at 0.7 V for H2/air and H2/O2, respectively. The accelerated stress tests (ASTs) showed superior durability of the Pt/MPTO catalyst as a cathode electrode. After 10,000 cycles of high-voltage cycling test from 0.9 V and 1.3 V RHE, no significant performance degradation of the Pt/MPTO electrode was observed comparing with Pt/C. Thus, MPTOs can be considered as a good substitute of carbon supports in fuel cells.

Original languageEnglish
Pages (from-to)6988-6994
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number9
DOIs
Publication statusPublished - 2015 Sep 1

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Keywords

  • Accelerated Stress Test
  • Durability
  • Electrocatalyst
  • Magnéli Phase Titanium Oxide
  • Polymer Electrolyte Fuel Cell

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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