期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 74, 页码 36836-36847出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.08.163
关键词
Oxygen reduction reaction; Single atom catalysts; Nitrogen-doped carbon aerogels; Co-N-C skeleton; Transition-metal-based electrocatalyst
资金
- Research Fund Program of the Key Laboratory of Fuel Cell Technology of Guangdong Prov-ince
- Guangzhou Science and Technology Plan Projects [201804010323]
Developing non-noble-metal-based electrocatalysts as alternatives to replace Pt-based catalysts for oxygen reduction reaction is crucial for large scale industrial application of fuel cells. The atomically dispersed Co atoms anchored on nitrogen-doped carbon aerogels show enhanced ORR activity and excellent long-term stability, which may provide a novel thought in the design and engineering of efficient electrocatalysts.
Developing non-noble-metal-based electrocatalysts as alternatives to replace Pt-based catalysts for oxygen reduction reaction (ORR) is crucial for large scale industrial application of fuel cells. Herein, we report a facile method to synthesize atomically dispersed Co atoms anchored on nitrogen-doped carbon aerogels with a 3D hierarchically porous network structure via F127-assisted pyrolysis of a phenolic resin/Co2+ composite and subsequent HCl etching treatment. HRTEM, AC-STEM, XRD, XPS, and Raman spectroscopy measurements demonstrate that Co atoms are homogeneously atomically dispersed on nitrogen-doped carbon aerogels within the porous structure by coordination with pyridinic-N. Among a series of samples, the Co-NCA@F127-1: 0.56 catalyst exhibits an enhanced ORR activity with onset potential (E-onset) of 0.935 V vs. RHE, the high diffusion limiting current density of 5.96 mA cm(-2) at 0.45 V, as well as an excellent resistance to methanol poisoning and good long-term stability in alkaline medium, comparable to the state-of-the-art Pt/C catalyst. This work may provide a novel and ingenious thought in the design and engineering of efficient and robust electrocatalysts based on single transition-metal atoms supported by nitrogen-doped carbon materials. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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