催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (6): 519-523.

• 研究论文 • 上一篇    下一篇

碳纳米管负载金属卟啉电催化剂制备及其催化活性

邓选英1,章冬云1,王昕2,原鲜霞1,马紫峰1*   

  1. 1 上海交通大学化学工程系, 上海 200240; 2 南洋理工大学化学与生物分子工程系, 新加坡 637459, 新加坡
  • 收稿日期:2008-06-25 出版日期:2008-06-25 发布日期:2012-04-28

Preparation and Catalytic Activity of Carbon Nanotube-Supported Metallporphyrin Electrocatalyst

DENG Xuanying1, ZHANG Dongyun1, WANG Xin2, YUAN Xianxia1, MA Zifeng1*   

  1. 1 Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2 School of Chemical and Biomolecular Engineering, Nanyang Technological University, Singapore 637459, Singapore
  • Received:2008-06-25 Online:2008-06-25 Published:2012-04-28

PDF

1371

被引次数

25

摘要： 采用微波合成法制备了多壁碳纳米管负载钴卟啉(CoTMPP/MWNT)电催化剂,利用透射电子显微镜对催化剂微观结构进行了表征,并通过旋转圆盘和旋转环盘技术对电催化剂的氧还原活性进行了评价. 结果表明,与有机回流合成法制备的催化剂相比,微波法合成的CoTMPP/MWNT催化剂具有更好的氧还原性能,半波电位正向移动110 mV; 与多孔碳为载体的CoTMPP/BP2000催化剂相比,多壁碳纳米管为载体的CoTMPP/MWNT电催化剂的起始电位高10 mV, 还原电流损失低21%, 表现出更好的氧还原活性和稳定性. 在CoTMPP/MWNT电催化剂表面进行的氧还原过程中电子转移数为3.6, H2O2生成量为18%. MWNT独特的电子特性、强抗腐蚀能力及其与活性钴离子之间的相互作用有助于改善催化剂的氧化还原性能.

关键词: 微波合成法, 多壁碳纳米管, 金属卟啉, 电催化剂, 氧还原

Abstract: The multiwalled carbon nanotube-supported CoTMPP (CoTMPP/MWNT) electrocatalyst was prepared by the microwave synthesis method and its microstructure was characterized using transmission electron microscopy. The electrocatalytic performance of CoTMPP/MWNT for oxygen reduction reaction (ORR) was evaluated by rotating disc electrode and rotating ring disc electrode technique. Compared with the CoTMPP/MWNT electrocatalyst prepared by the traditional organic reflux method, the one prepared by the microwave synthesis method showed better performance for ORR and the half-wave potential exhibited a positive shift of 110 mV. Compared with CoTMPP/BP2000, the CoTMPP/MWNT electrocatalyst showed a 10 mV higher on-set potential and a 21% lower reduction current loss in ORR, indicating that the multiwalled carbon nanotube-supported CoTMPP electrocatalyst had higher catalytic activity and better stability than CoTMPP/BP2000. The number of exchanged electrons during ORR and the yield of peroxide were 3.6 and 18%, respectively. The high corrosion resistance and unique electronic property of MWNT, and the interaction between MWNT and active metal ions can efficiently improve the electrocatalytic performance of the CoTMPP/MWNT catalyst.

Key words: microwave synthesis method, multiwalled carbon nanotube, metallporphyrin, electrocatalyst, oxygen reduction reaction