Pre-coordination anchoring strategy for modulating the coordination structure of iron single atoms and ORR performance
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 502, Page: 157943
2024
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Article Description
Among numerous potential alternatives to platinum-based catalysts, single-atom Fe catalysts with a symmetrical planar tetra-coordinated structure anchored by nitrogen (FeN 4 ) have shown the most promising ORR activity. However, extensive research has shown that the highly symmetric planar structure of the FeN 4 site leads to symmetric electron distribution, which is detrimental to the adsorption and activation of oxygen intermediates, thereby hindering further improvement in ORR kinetics and performance. Herein, using the pre-coordination anchoring strategy, we prepared high-loading S, N-coordinated single-atom catalysts with an FeSN 3 structure (referred to as Fe SACs/SNC). Due to the optimized charge distribution of Fe active centers, Fe SACs/SNC exhibited outstanding alkaline ORR performance. In addition, Fe SACs/SNC assembled as air cathodes in liquid and solid zinc-air batteries showed stable cycling for over 900 h (2700 cycles) and 190 h (1140 cycles), respectively, while solid-state batteries also demonstrated good flexibility.
Bibliographic Details
Elsevier BV
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