期刊
ACS APPLIED NANO MATERIALS
卷 5, 期 2, 页码 2280-2292出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03988
关键词
bioinspired surface; ZnO nanosheets; water transport; flow channel; proton-exchange membrane fuel cells (PEMFCs)
资金
- National Natural Science Foundation of China [51975245, 52075214]
- Jilin Provincial Science & Technology Department [20200201058JC, 20190303039SF]
- Key Science and Technology R&D Projects of Jilin Province [2020C023-3]
- Program of Jilin University Science and Technology Innovative Research Team [2020TD-03]
- Youth Development Program of Jilin University [2020-JCXK-22]
Inspired by natural micro-nanostructures, researchers have successfully fabricated a triple bioinspired surface that combines the advantages of superhydrophobic and superhydrophilic surfaces. They have also introduced an R value index to determine the optimal geometric parameters. This bioinspired strategy holds promise for the design of other micro-nanostructures.
Water management is important for the bipolar plates of proton-exchange membrane fuel cells (PEMFCs), and active drainage is a desirable feature for the design of bipolar plate channels. Herein, inspired by natural micro-nanostructures, a triple bioinspired surface has been fabricated, which combines the advantages of both superhydrophobic and superhydrophilic surfaces. The superhydrophobic surface (FZnO@CA-GS) is prepared by PFTS (perfluorodecyl trimethoxysilance) coating on ZnO nanosheet-decorated arrays of microscale cylinders manufac-tured by photolithography, and second-round photolithography is used to convert the superhydrophobic surface into a surface with wedged superhydrophilic patterns (WSPs). Then, the water transport performance has been investigated for the WSP, where the square of the initial velocity of the droplet is found to be proportional to the wedge angle from both the theoretical calculation and experimental data. Subsequently, an index of the R value representing the flow state of droplets has been introduced to determine the optimal values for the geometrical parameters of triple-bioinspired surface (TBS) in flow channels. Such a triple bioinspired strategy affords a promising approach to fabricate bipolar plate channels with the function of self-driven water transport for PEMFC. The use of the R value in optimization may also offer insights into the design of other micro-nanostructures.
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