Journal
ENERGY STORAGE MATERIALS
Volume 45, Issue -, Pages 805-813Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.12.029
Keywords
Dual single-atom catalyst; Soft template; Interlayer confinement; Oxygen reduction reaction; Zn-air battery
Funding
- National Natural Science Foundation of China [52125202, 51902161, 22179062, U2004209, 21908110]
- Natural Science Foundation of Jiangsu Province [BK20190479]
- China Postdoc-toral Science Foundation [2020M681613, 2021T140326]
- Guangdong Provincial Key Labora-tory of Computational Science and Material Design [2019B030301001]
- Guangdong Innovation Research Team Project [2017ZT07C062]
- Center for Computational Sci-ence and Engineering at Southern University of Science and Tech-nology
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This study reports a soft template-directed synthesis method for Fe-Co DSACs. Fe and Co single atoms are stabilized on 2D carbon nanosheets separately to form a FeN4S1/CoN4S1 configuration, which optimizes the catalytic activity for oxygen reduction reaction. The Fe-Co DSAC exhibits outstanding performance in oxygen reduction reaction and Zn-air batteries, outperforming monometallic Fe and Co SACs.
Dual single-atom catalysts (DSACs) with maximized atomic utilization efficiency largely depend on stabilization of dual-metallic single atoms on ideal supports, such as those two-dimensional (2D) atomic layers with open double-sided surfaces. However, the modulation of metal-2D support interactions is critical for enhancing the catalytic performance of DSACs, which has rarely been achieved by routine 2D atomic nanosheets. Here we report a soft template-directed interlayer confinement route for the synthesis of a Fe-Co DSAC. Fe and Co single atoms are stabilized separately on 2D carbon nanosheets via coordination with nitrogen (N) and sulfur (S) heteroatoms to form a FeN4S1/CoN4S1 configuration. The synergistic effect of Fe-Co dual metal centers can optimize the adsorption/desorption features and decrease the reaction barriers for enhanced oxygen reduction reaction (ORR) activities. The Fe-Co DSAC exhibits outstanding electrocatalytic activities of ORR with a half-wave potential of 0.86 V and Zn-air batteries with a maximum power density of 152.8 mW cm(-2), outperforming the monometallic Fe and Co SACs. This work paves a new avenue for synthesis of effective DSACs for high-performance electro-catalysis.
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