Dynamic wet-ETEM observation of Pt/C electrode catalysts in a moisturized cathode atmosphere

Kenta Yoshida, Alexander N. Bright, Michael R. Ward, Leonardo Lari, Xudong Zhang, Tomoki Hiroyama, Edward D. Boyes, Pratibha L. Gai

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The gas injection line of the latest spherical aberration-corrected environmental transmission electron microscope has been modified for achieving real-time/atomic-scale observations in moisturised gas atmospheres for the first time. The newly developed Wet-TEM system is applied to platinum carbon electrode catalysts to investigate the effect of water molecules on the platinum/carbon interface during deactivation processes such as sintering and corrosion. Dynamic in situ movies obtained in dry and 24% moisturised nitrogen environments visualize the rapid rotation, migration and agglomeration of platinum nanoparticles due to the physical adsorption of water and the hydroxylation of the carbon surface. The origin of the long-interconnected aggregation of platinum nanoparticles was discovered to be a major deactivation process in addition to conventional carbon corrosion.

Original languageEnglish
Article number425702
JournalNanotechnology
Volume25
Issue number42
DOIs
Publication statusPublished - 2014 Oct 24
Externally publishedYes

Keywords

  • catalysts
  • environmental transmission electron microscopy
  • in situ
  • nanoparticle
  • surface

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Yoshida, K., Bright, A. N., Ward, M. R., Lari, L., Zhang, X., Hiroyama, T., Boyes, E. D., & Gai, P. L. (2014). Dynamic wet-ETEM observation of Pt/C electrode catalysts in a moisturized cathode atmosphere. Nanotechnology, 25(42), [425702]. https://doi.org/10.1088/0957-4484/25/42/425702