Graphene-Carbon Nanotube Hybrids as Robust Catalyst Supports in Proton Exchange Membrane Fuel Cells
Graphene-Carbon Nanotube Hybrids as Robust Catalyst Supports in Proton Exchange Membrane Fuel Cells
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DOI：
10.1149/2.0891603jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Chua, Daniel H. C.
中科院分区：
文献类型：
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作者：
Kien-Cuong Pham;McPhail, David S.;Chua, Daniel H. C.
催化剂降解是阻碍质子交换膜燃料电池全球商业化的一个主要挑战。在这项研究中，我们研究了一种新的分层碳质载体的铂催化剂，称为石墨烯-碳纳米管混合物（GCNT）的发展，其降解行为在加速降解试验。碳支撑体通过将石墨烯直接生长到碳纳米管上以形成独特的全碳纳米结构来制造，所述全碳纳米结构具有超高密度的石墨烯的暴露石墨边缘和碳纳米管的多孔结构。GCNT负载的铂催化剂表现出比炭黑负载的铂催化剂更高的固有催化活性，并且比CNT负载的铂催化剂高得多。GCNT负载的铂催化剂的催化活性的增强解释了高石墨边缘密度，促进催化反应的铂催化剂。GCNT负载的铂催化剂还表现出优于炭黑负载的铂催化剂的电化学稳定性，这可以通过GCNT载体的高结晶度来解释。该上级稳定性表现为极化性能的较低损失、电荷转移电阻的较小增加、铂电化学表面积的较低损失、较低的碳腐蚀速率和更稳定的催化剂微结构。(C)作者（S）2016由ECS发布。All rights reserved.
Catalyst degradation is one major challenge preventing the worldwide commercialization of the Proton Exchange Membrane Fuel Cells. In this study, we investigate the development of a novel hierarchical carbonaceous support for the platinum catalysts, called graphene-carbon nanotube hybrids (GCNT), and its degradation behavior during an accelerated degradation test. The carbon support is fabricated by growing graphene directly onto carbon nanotubes to form a unique all-carbon nanostructure possessing both an ultra-high density of exposed graphitic edges of graphene and a porous structure of carbon nanotubes. The GCNT-supported platinum catalyst exhibits a higher intrinsic catalytic activity than a carbon black-supported platinum catalyst, and much higher than a CNT-supported platinum catalyst. The enhanced catalytic activity of the GCNT-supported platinum catalyst is explained by the high graphitic edge density which promotes the catalytic reactions on platinum catalyst. The GCNT-supported platinum catalyst also exhibits a superior electrochemical stability over that of the carbon black-supported platinum catalyst, explained by the high crystallinity of the GCNT support. The superior stability is expressed by a lower loss in polarization performance, a smaller increase in charge transfer resistance, a lower loss in the platinum electrochemical surface area, a lower rate of carbon corrosion, and a more stable catalyst microstructure. (C) The Author(s) 2016. Published by ECS. All rights reserved.