催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (6): 542-546.

• 研究论文 • 上一篇    下一篇

石墨纳米纤维用作质子交换膜燃料电池催化剂载体

徐洪峰,卢璐,朱少敏   

  1. 大连交通大学环境与化学工程学院, 辽宁大连 116028
  • 收稿日期:2008-06-25 出版日期:2008-06-25 发布日期:2012-04-28

Graphite Nanofibers as Catalyst Support for Proton Exchange Membrane Fuel Cells

XU Hongfeng*, LU Lu, ZHU Shaomin   

  1. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China
  • Received:2008-06-25 Online:2008-06-25 Published:2012-04-28

PDF

1117

被引次数

43

摘要： 利用质子交换膜燃料电池用过的废旧碳纸,采用球磨法制备了石墨纳米纤维(GNF, BET比表面积为229.3 m2/g), 并以GNF作为载体制备了Pt/GNF催化剂(电化学比表面积为98 m2/g). 与传统的以Vulcan XC-72碳黑为载体的Pt/XC-72催化剂相比,其电化学比表面积及Pt粒径大小相近. 采用恒电位氧化法考察了GNF, XC-72, Pt/GNF和Pt/XC-72的电化学稳定性. 结果表明,在相同条件下, XC-72的峰电流增加了60%, 而GNF增加了2%; Pt/XC-72的腐蚀电流比Pt/GNF的大40%; 恒电位氧化60 h后, Pt/XC-72约有84.7%的电化学比表面积损失, Pt/GNF仅损失37.2%. 这表明GNF的抗腐蚀性优于XC-72, 有希望成为质子交换膜燃料电池抗腐蚀的催化剂载体.

关键词: 铂, 碳纸, 石墨纳米纤维, 负载型催化剂, 质子交换膜燃料电池

Abstract: By a ball-milling method, graphite nanofibers (GNF) were prepared from used carbon paper in proton exchange membrane fuel cells. The surface area of GNF was 229.3 m2/g. 20% platinum was loaded on the GNF and XC-72 to fabricate Pt/GNF and Pt/XC-72 supported catalysts. The results of cyclic voltammetry showed that the Pt/GNF catalyst had the same electrochemical surface area (ESA) as the Pt/XC-72 catalyst. The morphology of these catalysts was charaterized by transmission electron microscopy. The electrochemical stability was measured for XC-72, GNF, Pt/XC-72, and Pt/GNF electrodes by the constant-potential oxidation. The peak current increased by 2% for GNF while 60% for XC-72. The corrosion current for Pt/XC-72 was 1.4 times of that for Pt/GNF. In addition, almost 84.7%ESA was lost for Pt/XC-72 catalyst after oxidation for60 h, while only 37.2%ESA was lost for Pt/GNF. The results indicated that GNF possessed much higher resistance to electrochemical oxidation than XC-72.

Key words: platinum, carbon paper, graphite nanofiber, supported catalyst, proton exchange membrane fuel cell