Metal-free nitrogen-doped carbon foam electrocatalysts for the oxygen reduction reaction in acid solution

J. Liu, S. Yu, T. Daio, M. S. Ismail, K. Sasaki, S. M. Lyth

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)

抄録

Metal-free, nitrogen-doped carbon foam is utilized as a model non-precious electrocatalyst system to investigate the role of nitrogen in the oxygen reduction reaction (ORR) in the absence of iron contamination. This graphene-like foam displays relatively high activity for the ORR in acid, despite being proven free from transition-metal impurities. The onset potential is 0.85 VRHE, the mass activity is 2.8 A/g at 0.6 VRHE, and the current density is -4.0 mA/cm2. The maximum electron transfer number is calculated to be 3.6, revealing that a 4-electron pathway is possible in nitrogen-doped carbon, even in the absence of transition-metal coordination sites. The excellent electrochemical activity is attributed to the large surface area (700 m2/g), improved conductivity after graphitization, and the relatively high proportion of tertiary (graphite-like) nitrogen.

本文言語英語
ページ(範囲)F1049-F1054
ジャーナルJournal of the Electrochemical Society
163
9
DOI
出版ステータス出版済み - 2016

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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