Evaluation of palladium-polymer electrolyte composite membranes synthesized by supercritical impregnation method

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420805
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Kyushu University
• Principal Investigator: IWAI Yoshio 九州大学, 工学研究院, 准教授 (80176528)
• Co-Investigator(Kenkyū-buntansha): YONEZAWA Setsuko 九州大学, 大学院工学研究院, 准助教 (50294898)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 直接メタノール燃料電池 / ナフィオン複合膜 / パラジウム錯体 / 超臨界流体含浸法 / メタノール浸透率 / プロトン伝導率 / 選択率 / 電池特性

Outline of Final Research Achievements

Palladium-Nafion composite membranes were synthesized by supercritical CO2 impregnation method to reduce methanol crossover in direct methanol fuel cells. The methanol permeabilities in all the Pd-Nafion membranes were smaller than that in Nafion membrane. When Pd particles were large, Pd particles acted as proton barriers. When Pd particles were small and dispersive, the proton conductivities increased, because Pd particles acted as proton conductors. The selectivities of Pd-Nafion membranes were higher than that of Nafion membrane. The selectivities had a maximum value when the Pd content at the surface was about 3 wt%. The Pd-Nafion membranes exhibited better cell performance than Nafion membrane. The maximum powers of cell performance had a trend to increase with increasing the selectivities.

Free Research Field

超臨界流体物性