期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 21, 页码 11240-11248出版社
AMER CHEMICAL SOC
DOI: 10.1021/am403479t
关键词
sintered mesoporous silica; phosphoric acid; high-temperature proton exchange membrane; fuel cells
资金
- Australian Research Council, Australia [DP120102325]
- Major International (Regional) Joint Research Project of the National Natural Science Foundation of China [51210002]
A novel inorganic proton exchange membrane based on phosphoric acid (PA)-functionalized sintered meso-porous silica, PA-meso-silica, has been developed and investigated. After sintering at 650 degrees C, the meso-silica powder forms a dense membrane with a robust and ordered mesoporous structure, which is critical for retention of PA and water within the porous material. The PA-meso-silica membrane achieved a high proton conductivity of 5 X 10(-3) to 5 X 10(-2) S cm(-1) in a temperature range of 80-220 degrees C, which is between 1 and 2 orders of magnitudes higher than a typical membrane Nafion 117 or polybenzimidazole (PBI)/PA in the absence of external humidification. Furthermore, the PA-meso-silica membranes exhibited good chemical stability along with high performance at elevated temperatures, producing a peak power density of 632 mW cm(-2) using a H-2 fuel at 190 degrees C in the absence of external humidification. The high membrane proton conductivity and excellent fuel cell performance demonstrate the utility of PA-meso-silica as a new class of inorganic proton exchange membranes for use in the high-temperature proton exchange membrane fuel cells (PEMFCs).
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