Solubility of Platinum in Acidic Media (I)—in Sulfuric Acid

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概要

• 論文の詳細を見る

• Platinum depositions have been observed in the electrolyte membrane of polymer electrolyte fuel cells (PEFCs) as in other types of fuel cells; PEFCs, MCFCs. The platinum solubility in the membrane must be a key issue to improve and guarantee the durability of PEFCs. In this basic study, the platinum solubility has been determined in an acidic medium as a function of temperature, pH, and potential which was controlled by the oxygen partial pressure. The solubility was 3.0×10−6 mol dm−3 at 23°C in 1 mol dm−3 H2SO4 under air, and increased with temperature and the decrease in pH. The platinum solubility slightly increased with the oxygen partial pressure in oxygen–nitrogen mixtures. However, the solubility in nitrogen was much smaller than the mixtures. Based on these results, the dissolution of platinum in an acidic medium would follow the acidic dissolution mechanism.

• 公益社団法人 電気化学会の論文

著者

• KAMIYA Nobuyuki

  Chemical Energy Laboratory, Yokohama National University

• Ota Ken-ichiro

  Chemical Energy Laboratory Yokohama National University

• KOIZUMI Yuki

  Chemical Energy Laboratory, Yokohama National University

• MITSUSHIMA Shigenori

  Chemical Energy Laboratory, Graduate School of Engineering, Yokohama National University

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