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题名: Mass-transport-controlled, large-area, uniform deposition of carbon nanofibers and their application in gas diffusion layers of fuel cells
作者: Tang, Xian1;  Xie, Zhiyong1;  Huang, Qizhong1;  Chen, Guofen1;  Hou, Ming2;  Yi, Baolian2
刊名: NANOSCALE
发表日期: 2015
DOI: 10.1039/c5nr00022j
卷: 7, 期:17, 页:7971-7979
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: The effect of mass transport on the growth characteristics of large-area vapor-grown carbon nanofibers (CNFs) was investigated by adjusting the substrate deposition angle (a). The catalyst precursor solution was coated onto one side of a 2D porous carbon paper substrate via a decal printing method. The results showed that the CNFs were grown on only one side of the substrate and a was found to significantly affect the growth uniformity. At alpha = 0 degrees, the growth thickness, the density, the microstructure and the yield of the CNF film were uniform across the substrate surface, whereas the growth uniformity decreased with increasing a, suggesting that the large-area CNF deposition processes were mass-transport-controlled. Computational fluid dynamics simulations of the gas diffusion processes revealed the homogeneous distributions of the carbon-source-gas concentration, pressure, and velocity near the substrate surface at alpha = 0 degrees, which were the important factors in achieving the mass-transport-limited uniform CNF growth. The homogeneity of the field distributions decreased with increasing a, in accordance with the variation in the growth uniformity with a. When used as a micro-porous layer, the uniform CNF film enabled higher proton exchange membrane fuel cell performance in comparison with commercial carbon black by virtue of its improved electronic and mass-transport properties confirmed by the electrochemical impedance spectroscopy results.
关键词[WOS]: CHEMICAL-VAPOR-DEPOSITION ;  MICRO-POROUS LAYER ;  MICROPOROUS LAYER ;  WATER TRANSPORT ;  CATALYTIC DECOMPOSITION ;  IMPEDANCE SPECTROSCOPY ;  GRAPHITE NANOFIBERS ;  OXYGEN REDUCTION ;  EPITAXIAL GROWTH ;  GRAPHENE OXIDE
语种: 英语
WOS记录号: WOS:000353981700056
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146216
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Lab Fuel Cells, Dalian 116023, Peoples R China

Recommended Citation:
Tang, Xian,Xie, Zhiyong,Huang, Qizhong,et al. Mass-transport-controlled, large-area, uniform deposition of carbon nanofibers and their application in gas diffusion layers of fuel cells[J]. NANOSCALE,2015,7(17):7971-7979.
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