非白金觸媒於直接甲醇燃料電池陰極端之研究

Studies on the non-platinum Catalyst on the Cathode for DMFC

張孫堂(S. T. Chang) ； 許新城(H. C. Hsu) ； 李松霖(S. L. Lee) ； 林麗瓊(L. C. Chen) ； 陳貴賢(K. H. Chen) ； 施漢章(H. C. Shih)

《華岡工程學報》 22期 (2008/06) Pp. 21-26

https://doi.org/10.29987/CCUHKJE.200806.0004

摘要

本研究使用5,10,15,20-四（4-甲氧苯基）卟吩鈷(CoTMPP)修飾20wt%商用白金碳粉(CoTMPP/Pt/C)的方法，製備所需的陰極觸媒，與20wt%商用白金碳粉相比較，前者由SEM可知觸媒經由燒結後，白金顆粒分散均勻、尺寸大小依舊在5 nm 以下。實驗工作是在飽和氧氣的硫酸溶液環境中測試，得知CoTMPP/Pt/C之氧氣還原能力只略比白金差；然而在飽和氧氣的硫酸甲醇環境中，20wt%CoTMPP修飾之白金碳粉有效的表現出抗甲醇毒化的行為，遠優於白金的表現。也就是說，CoTMPP/Pt/C解決甲醇滲透行為以避免毒化，因而提高白金活用的數量。

關鍵字

直接甲醇燃料電池 ； 氧還原反應 ； 非貴重金屬觸媒 ； 甲醇抗藥性

並列摘要

In this study, cobalt tetramethoxyphenyporphyrin (CoTMPP) was used to modify the platinum on carbon (CoTMPP/Pt/C) as catalyst. SEM, XRD, TEM, and electrochemical measurements were conducted to study the dispersion, particle size, physical characterization, and electrochemical behavior. For the usage of CoTMPP/Pt/C, SEM image showed that the particle size is below 5 nm after pyrolysis of porphyrin. The electrochemical behavior of CoTMPP/Pt/C for the oxygen reduction reaction (ORR) is similar to that of Pt/C in 1 M H2SO4. In methanol tolerance experiments, CoTMPP/Pt/C is insensitive to the methanol oxidation reaction. 20wt%CoTMPP/Pt/C has the best performance of the ORR with methanol among different ratios of CoTMPP to Pt/C.

並列關鍵字

DMFC ； ORR ； non-noble metal catalyst ； methanol-tolerance