Dissolution and surface area loss of platinum nanoparticles under potential cycling

Yu Sugawara, Amar Prasad Yadav, Atsushi Nishikata, Tooru Tsuru

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The relationship between dissolution and loss of the electrochemically active surface area (ECA) of Pt nanoparticles under potential cycling was investigated in a 0.5 M H2SO4 solution at 298 K. The nanoparticles were prepared on an Au electrode by electrodeposition in a 40 mM H2PtCl6 solution. Potential cycling was performed for 300 cycles in two different potential ranges: 0.0-1.0 V and 0.0-1.4 V. In both the potential ranges, ECA exhibited rapid loss during the first 100 cycles, but there were no significant changes in Pt dissolution. Pt dissolution was significantly enhanced by shifting the upper potential limit from 1.0 to 1.4 V, but ECA was not affected. On the basis of this result, it is expected that ECA loss was mainly due to agglomeration of Pt rather than electrochemical Ostwald ripening.

Original languageEnglish
Pages (from-to)379-383
Number of pages5
JournalJournal of Electroanalytical Chemistry
Volume662
Issue number2
DOIs
Publication statusPublished - 2011 Nov 15
Externally publishedYes

Keywords

  • Dissolution
  • PEMFC
  • Potential cycling
  • Pt catalyst
  • Surface area

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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