Porous graphene supported Pt catalysts for proton exchange membrane fuel cells

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• 作者：Kun Cheng ; Daping He ; Tao Peng ; Haifeng Lv ; Mu Pan ; Shichun Mu ; ^{msc@whut.edu.cn" class="auth_mail} ; ^{mushichun@gmail.com" class="auth_mail}
• 关键词：PEM fuel cell ; Catalyst ; Electrode ; Pore ; Graphene
• 刊名：Electrochimica Acta
• 出版年：20 June 2014
• 年：2014
• 卷：132
• 期：Complete
• 页码：356-363
• 全文大小：2423 K

文摘

Graphene nanosheet (GNS) has a remarkably high ratio of surface area to thickness and intense inter-sheet aggregation, which heavily resist mass diffusion in vertical orientation. Here, we establish a fast-speed mass diffusion passage by creating pores in GNS, and the corresponding Pt catalyst (Pt/rPGO) displays 15.5 times mass diffusion rate than that of the pristine GNS supported Pt catalyst (Pt/rGO). Thus, the Pt/rPGO catalyst exhibits 1.5 times increase in Pt mass activity toward oxygen reduction reaction compared with the Pt/rGO. Significantly, after H₂ thermal treatment, the mass activity of the Pt/rPGO further increases to 1.9 times that of the Pt/rGO, and its electrochemical stability is also greatly improved.