Manipulation of New Married Edge‐Adjacent Fe2N5 Catalysts and Identification of Active Species for Oxygen Reduction in Wide pH Range
Source abstract
Abstract
Abstract Transition metal‐nitrogen‐carbon‐based catalysts (M‐N‐C) serve as promising alternatives for oxygen reduction reaction (ORR). However, their synthesis generally involves complex pyrolysis reactions, resulting in their high structure heterogeneity and consequently making it difficult to distinguish the catalytic active sites. Herein, atomically dispersed Fe2 on the hollow carbon spheres are synthesized as the model for insight into the active sites at the atomic level. By virtue of the systematic SCN− poisoning experiments and theoretical calculations, the authors find that both edge‐adjacent Fe2N5 and graphitic N sites exhibit the pH‐dependent poisoning kinetics, beyond a simple and traditional “SCN− poisoning M‐Nx sites” notion, helping us to discriminate the edge‐adjacent Fe2N5 structure and graphitic N species as the bi‐active ORR sites in a wide pH range. Moreover, this is the first work to synthesize the new married edge‐adjacent Fe2N5 structure in an experimental aspect. The original work offers an important insight to pinpoint the active species in different pH media, which can broaden the fundamental understanding to design M‐N‐C and metal‐free‐carbon‐based catalysts for ORR.
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Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering Ocean University of China Qingdao 266100 China
Center for Energy Science and Technology Skolkovo Institute of Science and Technology Skolkovo Innovation Center Moscow 143026 Russia
Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science the Chinese Academy of Sciences Nanjing 210008 China
State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical Power Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China
Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China
National Synchrotron Radiation Laboratory (NSRL) University of Science and Technology of China Hefei 230029 China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Shandong Province
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