X-ray photoemission spectroscopy analysis of N-containing carbon-based cathode catalysts for polymer electrolyte fuel cells

详细信息    查看全文

• 作者：Hideharu Niwa ; Masaki Kobayashi ; Koji Horiba ; Yoshihisa Harada ; Masaharu Oshima ; Kiyoyuki Terakura ; Takashi Ikeda ; Yuka Koshigoe ; Jun-ichi Ozaki ; Seizo Miyata ; Shigenori Ueda ; Yoshiyuki Yamashita ; Hid
• 关键词：Polymer electrolyte fuel cell ; Cathode ; Oxygen reduction reaction ; X-ray photoemission spectroscopy ; Carbon alloy catalysts ; Electronic structure
• 刊名：Journal of Power Sources
• 出版年：2011
• 出版时间：1 February 2011
• 年：2011
• 卷：196
• 期：3
• 页码：1006-1011
• 全文大小：817 K

文摘

We report on the electronic structure of three different types of N-containing carbon-based cathode catalysts for polymer electrolyte fuel cells observed by hard X-ray photoemission spectroscopy. Prepared samples are derived from: (1) melamine and poly(furfuryl alcohol), (2) nitrogen-doped carbon black and (3) cobalt phthalocyanine and phenolic resin. C 1s spectra show the importance of sp² carbon network formation for the oxygen reduction reaction (ORR) activity. N 1s spectra of the carbon-based cathode catalysts are decomposed into four components identified as pyridine-like, pyrrole- or cyanide-like, graphite-like, and oxide nitrogen. Samples having high oxygen reduction reaction activity in terms of oxygen reduction potential contain high concentration of graphite-like nitrogen. O 1s spectra are similar among carbon-based cathode catalysts of different oxygen reduction reaction activity. There is no correlation between the ORR activity and oxygen content. Based on a quantitative analysis of our results, the oxygen reduction reaction activity of the carbon-based cathode catalysts will be improved by increasing concentration of graphite-like nitrogen in a developed sp² carbon network.