Studies on degradation mechanism of electrocatalysts for fuel cells through in-situ sem/stem observation

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Abstract

OVERVIEW: Electrode catalysts play a crucial role as the key determinant of the performance of fuel cells, a technology recognized as being central to the wider adoption of hydrogen-based energy. Electrode catalysts are composed of platinum nanoparticles distributed on a carbon support, and this carbon is known to degrade at high voltage due to oxidation. This article describes a technique for assessing catalyst durability through in-situ observation under an SEM/STEM in a controlled atmosphere. The technique introduces air to create an oxidizing atmosphere and performs in-situ observation of the degradation process. Simultaneous SEM/STEM observation identified the sinking of platinum particles due to carbon oxidization as one of the degradation mechanisms. This direct observation of this degradation process will provide a valuable analytical technique for the future design of materials with high durability.

Original languageEnglish
Pages34-38
Number of pages5
Volume65
No.7
Specialist publicationHitachi Review
Publication statusPublished - Aug 1 2016

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Hardware and Architecture
  • Process Chemistry and Technology
  • Electrical and Electronic Engineering

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