Oxygen reduction activity of N-doped carbon-based films prepared by pulsed laser deposition

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• 作者：Teruyuki Hakoda ; Shunya Yamamoto ; Kazuhiro Kawaguchi ; Tetsuya Yamaki ; Tomohiro Kobayashi ; Masahito Yoshikawa
• 关键词：Fuel cell ; Non-platinum cathode catalyst ; Oxygen reduction activity ; Carbon-based film ; Pulsed laser deposition
• 刊名：Applied Surface Science
• 出版年：2010
• 出版时间：15 December 2010
• 年：2010
• 卷：257
• 期：5
• 页码：1556-1561
• 全文大小：647 K

文摘

Carbon-based films with nitrogen species on their surface were prepared on a glassy carbon (GC) substrate for application as a non-platinum cathode catalyst for polymer electrolyte fuel cells. Cobalt and carbon were deposited in the presence of N₂ gas using a pulsed laser deposition method and then the metal Co was removed by HCl-washing treatment. Oxygen reduction reaction (ORR) activity was electrochemically determined using a rotating disk electrode system in which the film samples on the GC substrate were replaceable. The ORR activity increased with the temperature of the GC substrate during deposition. A carbon-based film prepared at 600 °C in the presence of N₂ at 66.7 Pa showed the highest ORR activity among the tested samples (0.66 V vs. NHE). This film was composed of amorphous carbons doped with pyridine type nitrogen atoms on its surface.