多角バレルスパッタリング法を用いて調製した固体高分子形燃料電池用 Pt/TiN/C カソード触媒の電気化学的劣化耐性

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  • タカク バレルスパッタリングホウ オ モチイテ チョウセイ シタ コタイ コウブンシケイ ネンリョウ デンチヨウ Pt/TiN/Cカソード ショクバイ ノ デンキ カガクテキ レッカ タイセイ
  • Electrochemical Degradation Resistance of Pt/TiN/C Cathode Catalysts for Polymer Electrolyte Fuel Cells prepared using the Polygonal Barrel-Sputtering Method

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Electrochemical degradation resistance of carbon-supported Pt and TiN (Pt/TiN/C) cathode catalysts for polymer electrolyte fuel cells prepared using the polygonal barrel-sputtering method was investigated. The characterization of the prepared carbon-supported TiN (TiN/C) samples showed that TiN nanoparticles were uniformly deposited on the surfaces of the carbon particles. Subsequently, Pt/TiN/C catalysts were prepared by sputtering Pt on the TiN/C samples. The change in electrochemical surface areas (ESAs) of the obtained samples was evaluated by successive potential cycling. As compared with the carbon-supported Pt catalyst, the Pt/TiN/C catalyst with the amount of TiN deposited of 10 wt.% showed smaller ESA reduction after 100th potential cycling. The effects of TiN on the ESA reduction became greater by increasing the amount of deposited TiN from 10 to 24 wt.%, although the ESA absolute values decreased. These results demonstrate that TiN deposition is useful to prevent ESAs from reduction and improve the durability of PEFCs.

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