物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1311-1316.doi: 10.3866/PKU.WHXB20100521

催化和表面结构 上一篇    下一篇

炭载体改性对炭载Pd催化剂电催化性能的影响

丁良鑫, 王士瑞, 郑小龙, 陈煜, 陆天虹, 曹殿学, 唐亚文   

  1. 南京师范大学化学与环境科学学院, 南京 210097; 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001
  • 收稿日期:2009-10-09 修回日期:2010-01-04 发布日期:2010-04-29
  • 通讯作者: 陈煜, 唐亚文 E-mail:tangyawen@njnu.edu.cn; nsdchenyu@126.com

Effect of Carbon Modification on Electrocatalytic Performance of Carbon Supported Pd Catalysts

DING Liang-Xin, WANG Shi-Rui, ZHENG Xiao-Long, CHEN Yu, LU Tian-Hong, CAO Dian-Xue, TANG Ya-Wen   

  1. School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, P. R. China; College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
  • Received:2009-10-09 Revised:2010-01-04 Published:2010-04-29
  • Contact: CHEN Yu, TANG Ya-Wen E-mail:tangyawen@njnu.edu.cn; nsdchenyu@126.com

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摘要：

研究了硝酸和氨水改性处理对活性炭表面基团、炭载Pd纳米粒子的形态及其对甲酸氧化电催化性能的影响. 傅里叶变换红外(FT-IR)光谱、X射线光电子能谱(XPS)及Boehm滴定结果表明, 硝酸和氨水处理分别增加了活性炭表面含氧基团和含氮基团的含量. 透射电镜(TEM)及电化学测试显示, 活性炭经硝酸处理后, 表面负载的Pd粒子粒径降低, 催化剂对甲酸氧化活性和稳定性提高. 进一步用氨水处理后, Pd粒子的粒径没有明显变化, 但催化剂中Pd0的含量增加, 催化剂性能进一步提高.

关键词: 活性炭, 炭载Pd催化剂, 硝酸处理, 氨水处理, 甲酸氧化

Abstract:

The effect of carbon modification on electrocatalytic performance of carbon supported Pd catalysts was investigated. Fourier transform infrared (FT-IR) spectrometer, X-ray photoelectron spectroscopy (XPS) and Boehm titration measurements demonstrate that the contents of O-containing groups and N-containing groups on the activated carbon surface increase via HNO3 and NH4OHtreatment. Transmission electron microscope (TEM) and electrochemical measurements indicate that the treatment of activated carbon with HNO3 can decrease the size of the Pd particles. Thus, the electrocatalytic activity and stability of the carbon supported Pd catalyst for the oxidation of formic acid are enhanced. The treatment of activated carbon with NH4OH has almost no effect on the Pd particles size, however, the content of Pd0 in the Pd/C catalyst enhances, which leads to the further increase in the electrocatalytic performance the Pd/C catalyst.

Key words: Activated carbon, Carbon supported Pd catalyst, Nitric acid treatment, Ammonia treatment, Formic acid oxidation