Polyhedral Carbon Anchored on Carbon Nanosheet with Abundant Atomic Fe-Nx Moieties for Oxygen Reduction

Dong Liu, Chenxi Huyan, Yuanyuan Zhao, Xiaoteng Liu, Ding Wang, Jining Sun, Sheng Dai, Fei Chen, Ben Bin Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon-based single-atom iron electrocatalysts with nitrogen coordination (CSAIN) have recently shown enormous promise to replace the costly Pt for boosting the cathodic oxygen reduction reaction (ORR) in fuel cells. However, there remains a great challenge to achieve highly efficient CSAIN catalysts for the ORR in acidic electrolytes. Herein, a novel CSAIN catalyst is synthesized by pyrolyzing a precursor mixture consisting of metal–organic framework and conductive polymer hybrid. After pyrolysis at a high temperature, the CSAIN with a structure of carbon nanosheet supported polyhedral carbon is achieved, where the unique structure endows CSAIN with expediting electron transfer and mass transport, as well as largely exposed surface to host atomically dispersed iron active sites. As a result, the optimal CSAIN catalyst shows a high ORR activity with its half-wave potential of 0.77 V (vs RHE) and a Tafel slope of 74.1 mV dec–1, which are comparable to that of commercial Pt/C catalyst (0.80 V and 81.9 mV dec–1).
Original languageEnglish
Article number2200276
Pages (from-to)1-7
Number of pages7
JournalAdvanced Materials Interfaces
Early online date7 Apr 2022
DOIs
Publication statusE-pub ahead of print - 7 Apr 2022

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