Fabrication and evaluation of membrane electrode assemblies by low-temperature decal methods for direct methanol fuel cells

Jae Hyung Cho, Jang Mi Kim, Joghee Prabhuram, Sang Youp Hwang, Dong June Ahn, Heung Yong Ha, Soo Kil Kim

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

In this study, a low-temperature decal transfer method is used to fabricate membrane electrode assemblies (MEAs) and the MEAs are tested for application in a direct methanol fuel cell (DMFC). The low-temperature decal transfer uses a carbon-layered decal substrate with a structure of ionomer/catalyst/carbon/substrate to facilitate the transfer of catalyst layers from the decal substrates to the membranes at a temperature as low as 140 °C, and also to prevent the formation of ionomer skin layer that is known to be formed on the surface of the transferred catalyst layer. The DMFC performance of the MEA (with carbon layer) fabricated by the low-temperature decal transfer method is higher than those of MEAs fabricated by the same method without a carbon layer, a conventional high-temperature decal method, and a direct spray-coating method. The improved DMFC performance of the MEA fabricated with carbon layer by the low-temperature decal transfer method can be attributed to the absence of an ionomer skin on the catalyst layer, which can streamline the diffusion of reactants. Furthermore, the intrinsic properties of the MEA fabricated by the low-temperature decal transfer method are elucidated by field-emission scanning electron microscopy (FESEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) techniques, and cathode CO2 analysis.

Original languageEnglish
Pages (from-to)378-386
Number of pages9
JournalJournal of Power Sources
Volume187
Issue number2
DOIs
Publication statusPublished - 2009 Feb 15

Keywords

  • Carbon
  • Direct methanol fuel cell
  • Ionomer skin
  • Low-temperature decal
  • Membrane electrode assembly

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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