期刊
APPLIED SURFACE SCIENCE
卷 327, 期 -, 页码 205-212出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.11.087
关键词
Direct methanol fuel cells; Thermal imprint lithography; Roughness factor; Charge transfer resistance; Catalyst utilization; Mass transport
类别
资金
- National Basic Research Program of China (973 Program) [2012CB932803]
- National Natural Science Foundation of China [21276158]
- Shanghai Ministry of Science and Technology [12ZR1431200, 13DZ1205100]
- Drexel-SARI global funding program
Nafion (R) 115 membrane, patterned by thermal imprint lithography on the anode side, is used for passive direct methanol fuel cells (DMFCs). The membrane roughness factor, defined as the ratio between the actual and projected membrane surface area, was investigated for its effects on the performance of the DMFCs. When the anode Pt-Ru (1:1) catalyst loading is 1.0 mg cm(-2), the maximum power density of the DMFC with a surface-patterned membrane (roughness factor: 5.4) using 3.0 M methanol as the fuel at 25 +/- 1 degrees C reaches 27.2 +/- 0.3 mW cm(-2), an increase of similar to 57.2% in comparison to DMFC using the pristine membrane (roughness factor: similar to 1.0). Further, electrochemical characterization indicates that increased roughness factor of the membrane results in increased electrochemically active surface area and reduced charge transfer resistance in the cell. These performance improvements are ascribed to the increased surface roughness which enlarges the membrane/catalyst interface, possibly facilitating mass transport of the fuel and improving anode catalyst utilization. Thus, patterned membranes have great potential in improving the performance of fuel cells and reducing catalyst loading. (C) 2014 Elsevier B.V. All rights reserved.
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