质子交换膜燃料电池催化层孔隙率检测方法
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摘要
孔径分布和孔隙率是催化层的重要结构参数,影响质子交换膜燃料电池的性能。由于催化层多孔、脆弱,自身缺乏自支撑作用,采用压汞法测量催化层的孔径分布和孔隙率时,所测结果包含了基底(碳纸或电解质膜)的贡献,催化层与基底的孔隙混合,难以分离,致使误差偏大,影响测量的准确度。采用无压缩性且具有柔韧度的无孔材料作为催化层的基底,改进了压汞法测量工艺和孔隙率的计算方法,提高了催化层的孔径分布和孔隙率测量的精确度。
Pore size distribution and porosity are important parameters of catalyst layer, which is crucial to the performance of proton exchange membrane fuel cell(PEMFC). The porous and fragile carbon paper makes it difficult to decouple the porosimetry of catalyst layer from catalyst-coated paper or catalyst-coated membrane. The unavoidable overlap of pore size distribution between the substrate and catalyst layer would affect the accuracy and reliability. A new method was developed to measure the porosimetry of catalyst layer. A non-porous material was selected as substrate of catalyst layer, and the details of sample preparation, porosimetry measurement, porosity calculation procedures and verification were reported
Pore size distribution and porosity are important parameters of catalyst layer, which is crucial to the performance of proton exchange membrane fuel cell(PEMFC). The porous and fragile carbon paper makes it difficult to decouple the porosimetry of catalyst layer from catalyst-coated paper or catalyst-coated membrane. The unavoidable overlap of pore size distribution between the substrate and catalyst layer would affect the accuracy and reliability. A new method was developed to measure the porosimetry of catalyst layer. A non-porous material was selected as substrate of catalyst layer, and the details of sample preparation, porosimetry measurement, porosity calculation procedures and verification were reported
引文
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[4]汤永净,汪鹏飞,邵振.压汞实验和误差分析[J].实验技术与管理,2015,32(5):50-54.
[5]王红梅.压汞法测定多孔材料孔结构的误差[J].广州化工,2009,37(1):109-111.
[2] XIE J,KARREN L,THOMAS A Z,et al. Porosimetry of MEAsmade by“thin film decal” method and its effect on performanceof PEFCs[J]. J Eelectrochem Soc,2004,151:A1841-A1846.
[3] TUCKER M,MADELEINE O,PETER B L,et al. The pore struc-ture of direct methanol fuel cell electrodes[J]. J Eelectrochem Soc,2005,152:A1844-A1850.
[4]汤永净,汪鹏飞,邵振.压汞实验和误差分析[J].实验技术与管理,2015,32(5):50-54.
[5]王红梅.压汞法测定多孔材料孔结构的误差[J].广州化工,2009,37(1):109-111.