Defective Nitrogen-Doped Graphene Foam: Clarifying the Role of Nitrogen in Non-Precious ORR Catalysts

Iron-free, nitrogen-doped graphene foam is presented as a model electrocatalyst system for studying the role of nitrogen in the oxygen reduction reaction in non-precious Fe/N/C-based electrocatalysts. Due to the large surface area and high porosity, these electrocatalysts display high activity in ro...

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Bibliographic Details
Main Authors: Liu, Jianfeng, Daio, Takeshi, Sasaki, Kazunari, Lyth, Stephen Matthew
Format: Conference Proceeding
Language:English
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Summary:Iron-free, nitrogen-doped graphene foam is presented as a model electrocatalyst system for studying the role of nitrogen in the oxygen reduction reaction in non-precious Fe/N/C-based electrocatalysts. Due to the large surface area and high porosity, these electrocatalysts display high activity in rotating ring-disk electrode voltammetry measurements. The electron transfer number is as high as 3.6, despite the metal-free nature of this electrocatalyst. The sample with the highest activity has a significantly larger proportion of tertiary / graphite-like nitrogen, and therefore this is proposed as a 4-electron oxygen reduction active site in acid environment.
ISSN:1938-5862
1938-6737
DOI:10.1149/06403.0271ecst