催化学报

催化学报 ›› 2013, Vol. 34 ›› Issue (6): 1105-1111.DOI: 10.1016/S1872-2067(11)60480-4

• 研究论文 • 上一篇    下一篇

甲醇浓度对Pt/C催化剂氧还原活性的影响

唐水花a,b,b, 林文锋b, Paul A. CHRISTENSENb, Geir Martin HAARBERGc   

  1. a 西南石油大学油气藏地质及开发工程国家重点实验室, 四川成都610500;
    b 纽卡斯尔大学化工和先进材料学院, 纽卡斯尔NE1 7RU, 英国;
    c 挪威科技大学材料科学与工程系, 特隆赫姆7491, 挪威
  • 收稿日期:2012-11-06 修回日期:2012-11-14 出版日期:2013-06-07 发布日期:2013-06-09
  • 通讯作者: 唐水花

Effect of methanol concentration on oxygen reduction reaction activity of Pt/C catalysts

TANG Shuihuaa,b,b, LIN Wenfengb, Paul A. CHRISTENSENb, Geir Martin HAARBERGc   

  1. a State Key Lab of Oil and Gas Reservoir Geology & Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China;
    b School of Chemical Engineering and Advanced Materials, Newcastle University, NE1 7RU Newcastle upon Tyne, United Kingdom;
    c Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
  • Received:2012-11-06 Revised:2012-11-14 Online:2013-06-07 Published:2013-06-09

PDF

935

被引次数

18

摘要：

采用半池考察了Pt/C催化剂在含不同浓度甲醇的0.5mol/L硫酸中的氧还原活性(ORR).研究发现,当甲醇浓度为0.1mol/L时,Pt/C催化剂的ORR活性最高,在催化层上热压商品NafionNRE-212膜后也出现同样趋势.线性扫描伏安曲线显示,压膜前后的Pt/C催化剂的ORR活性在含0.1mol/L甲醇的0.5mol/L硫酸中几乎没有变化.电化学阻抗谱结果表明,在该溶液中,Nafion膜的电阻比在其它电解液中低,这可能是导致Pt/C催化剂ORR活性提高的主要原因.有必要关注Nafion膜的这一异常性质并通过特殊设计后用于电池堆,以提高燃料电池性能.

关键词: 铂, 炭, 甲醇渗透, 氧还原, 燃料电池

Abstract:

The oxygen reduction reaction (ORR) activity of Pt/C catalysts was investigated in electrolytes of 0.5 mol/L H2SO4 containing varying concentrations of methanol in a half-cell. It was found that the ORR activity was improved notably in an electrolyte of 0.5 mol/L H2SO4 containing 0.1 mol/L CH3OH as compared with that in 0.5 mol/L H2SO4, 0.5 mol/L H2SO4 containing 0.5 mol/L CH3OH, or 0.5 mol/L H2SO4 containing 1.0 mol/L CH3OH electrolytes. The same tendency for improved ORR activity was also apparent after commercial Nafion® NRE-212 membrane was hot-pressed onto the catalyst layers. The linear sweep voltammetry results indicate that the ORR activities of the Pt/C catalyst were almost identical in the 0.5 mol/L H2SO4+0.1 mol/L CH3OH solution before and after coated with the Nafion® membrane. Electrochemical impedance spectroscopy results demonstrated that the resistance of the Nafion® membrane is smaller in the electrolyte of 0.5 mol/L H2SO4+0.1 mol/L CH3OH than in other electrolytes with oxygen gas feed. This exceptional property of the Nafion® membrane is worth investigating and can be applied in fuel cell stacks to improve the system performance.

Key words: Platinum, Carbon, Methanol crossover, Oxygen reduction, Fuel cell