Abstract
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.
Published Version
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