Yayin Li , Haomin Jiang , Liu Lin , Zemin Sun , Genban Sun
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引用次数: 0
Abstract
The oxygen reduction reaction (ORR) could be effectively regulated by adjusting electron configurations and optimizing chemical bonds. Herein, we have achieved the modulation of electron distribution in Fe single atomic (FeSA) sites through Fe atomic clusters (FeAC) via a confined pyrolysis approach, thereby enhancing their intrinsic ORR activity. X-ray absorption spectroscopy has confirmed that the presence of iron atomic clusters could influence the electron distribution at Fe-N4 sites. The FeSA/FeAC-NC catalyst exhibits a half-wave potential of 0.88 V, surpassing the individual FeSA-NC structure. Through electronic structure analysis, it could be seen that iron atom clusters can affect Fe-N4 sites through long-range effects, and then effectively lower reaction barriers and enhance the reaction kinetics at Fe-N4 sites. The synthetic approach might pave the way for constructing highly active catalysts with tunable atomic structures, representing an effective and universal technique for electron modulation in M-N-C systems. This work provides enlightenment for the exploration of more efficient single-atom electrocatalysts and the optimization of the performance of atomic electrocatalysts. Furthermore, a zinc-air battery assembled using it on their cathode deliver a high peak power density (205.7 mW cm−2) and a high-specific capacity of 807.5 mA h g−1. This study offers a fresh approach to effectively enhance the synergistic interaction of between Fe single atom and Fe atomic clusters for improving ORR activity and energy storage.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy