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

Liu, Dong, Huyan, Chenxi, Zhao, Yuanyuan, Liu, Xiaoteng, Wang, Ding, Sun, Jining, Dai, Sheng, Chen, Fei and Xu, Bin (2022) Polyhedral Carbon Anchored on Carbon Nanosheet with Abundant Atomic Fe-Nx Moieties for Oxygen Reduction. Advanced Materials Interfaces, 9 (15). p. 2200276. ISSN 2196-7350

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Official URL: https://doi.org/10.1002/admi.202200276

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).

Item Type: Article
Additional Information: Funding information: This work was supported partially by the China Postdoctoral Science Foundation (2020M683469), the National Natural Science Foundation of China (No. 21803040), Young Talent Support Plan of Xi'an Jiaotong University (China) and the Engineering and Physical Sciences Research Council (EPSRC, UK) grant-EP/N007921 and EP/S032886.
Uncontrolled Keywords: Fe-N-C, oxygen reduction, polypyrrole, single-atom electrocatalyst, zeolitic imidazolate frameworks
Subjects: H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 21 Mar 2022 12:02
Last Modified: 24 May 2022 15:00
URI: http://nrl.northumbria.ac.uk/id/eprint/48714

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