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MOF-derived nitrogen-doped porous carbon (NPC) supported CoFe2O4 nanoparticle composites for high-performance zinc-air batteries

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Abstract

The sluggish kinetics of oxygen reduction reaction (ORR) in air cathode severely hinders the application of rechargeable zinc-air batteries (ZAB). In this work, we construct a composite with CoFe2O4 nanoparticle uniformly implanted into MOF-derived nitrogen-doped porous carbon (CoFe2O4/NPC) by a dopamine wrap** strategy. The CoFe2O4/NPC exhibits an outstanding ORR performance in 0.1 M KOH with a half-wave potential (E1/2) of 0.898 V, which is superior to single metal nanoparticle samples (Fe/Fe2O3/NPC, Co/NPC) and pure CoFe2O4 nanoparticle without NPC. Results suggest that NPC support effect and Fe, Co dual component effect play important roles in boosting the ORR activity of CoFe2O4/NPC, because the two kinds of effects can regulate the charge transfer of support and CoFe2O4, and electronic transfer of Fe and Co, and therefore improve the ORR performance. Impressively, using CoFe2O4/NPC as the cathode catalyst, CoFe2O4/NPC-based ZAB exhibits a 269 mW cm−2 power density and a long durability over 700 h, which is attributed to the fact that thin carbon layers around the surface of the CoFe2O4 nanoparticles improve the stability. As a result, the CoFe2O4/NPC catalyst exceeds the upper limit line of the trade-off effect between activity and stability. This work provides a new route for the application of metal-nanoparticle composite in rechargeable zinc-air batteries.

Graphical Abstract

We synthesized a CoFe2O4/NPC composite by a dopamine wrap** strategy, and the performance of CoFe2O4/NPC catalyst exceeds the upper limit line of the trade-off effect between activity and stability of Fe, Co-based catalysts for ZAB applications.

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  1. **aobin Dong and Panpan Sun contributed equally to this work.

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  1. State Key Laboratory of Organic-Inorganic Composites, Bei**g University of Chemical Technology, Bei**g, 100029, People’s Republic of China

    **aobin Dong, Panpan Sun, Jialin Wu, Shiqing Huang, **aofei Zeng, Shitao Wang, **udong Chen & Dapeng Cao

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Dapeng Cao produced original idea and designed the experiment. **aobin Dong and Panpan Sun performed experimental synthesis and characterizations. Jialin Wu, Shiqing Huang, **aofei Zeng, and Shitao Wang discussed the results and analyzed experimental data. **udong Chen performed a part of tests on Zn-air batteries. **aobin Dong and Panpan Sun wrote the initial manuscript. Dapeng Cao revised the manuscript. All authors read and approved the final manuscript.

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Dong, X., Sun, P., Wu, J. et al. MOF-derived nitrogen-doped porous carbon (NPC) supported CoFe2O4 nanoparticle composites for high-performance zinc-air batteries. Adv Compos Hybrid Mater 6, 72 (2023). https://doi.org/10.1007/s42114-023-00644-1

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