Preparation and Catalytic Activity of Carbon Nanotube-Supported Metalloporphyrin Electrocatalyst

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• 作者：Xuanying DENG ; Dongyun ZHANG ; Xin WANG ; Xianxia YUAN ; Zifeng MA
• 关键词：microwave synthesis method ; multiwalled carbon nanotube ; metalloporphyrin ; electrocatalyst ; oxygen reduction reaction
• 刊名：Chinese Journal of Catalysis
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：29
• 期：6
• 页码：519-523
• 全文大小：690 K

文摘

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 CoTMPP/MWNT 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.