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Platinum dissolution models and voltage cycling effects: platinum dissolution in polymer electrolyte fuel cell (PEFC) and low-temperature fuel cells

Advances in Electrocatalysis, Materials, Diagnostics and Durability

Electrocatalyst materials for low temperature fuel cells

Catalyst durability

  1. K. Ota,
  2. Y. Koizumi

Published Online: 15 DEC 2010

DOI: 10.1002/9780470974001.f500015

Handbook of Fuel Cells

Handbook of Fuel Cells

How to Cite

Ota, K. and Koizumi, Y. 2010. Platinum dissolution models and voltage cycling effects: platinum dissolution in polymer electrolyte fuel cell (PEFC) and low-temperature fuel cells. Handbook of Fuel Cells. .

Author Information

  1. Yokohama National University, Hodogaya-ku, Yokohama, Japan

Publication History

  1. Published Online: 15 DEC 2010

Abstract

All the metals except gold form a metal oxide on the surface in the presence of oxygen at room temperature. Once an oxide layer is formed on a metal surface, it dissolves into a solution to some extent. This is the dissolution. Even platinum makes an oxide layer and has solubility. Platinum islands in an electrolyte membrane in polymer electrolyte fuel cells (PEFCs) were reported in many papers. These islands are closely related to the dissolution of Pt from cathode. Platinum dissolves in an acidic media in the presence of oxygen although the solubility is very low. The solubility is proportional to pH of sulfuric acid solution and increases at higher temperatures. The dissolution reaction follows the acid dissolution mechanism. The dissolution reaction is enhanced by the potential cyclings. Considering the characteristics of fuel cell vehicles, there are voltage changes and the dissolution of Pt should be reduced.

Keywords:

  • platinum;
  • solubility;
  • acid;
  • cathode;
  • oxide;
  • polymer electrolyte fuel cell