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Hierarchical peony-like FeCo-NC with conductive network and highly active sites as efficient electrocatalyst for rechargeable Zn-air battery

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Nano Research 2020年第4期13卷 1090-1099页

作者： Yiyan Wang Anuj Kumar Mang Ma Yin Jia Yu Wang Ying Zhang Guoxin Zhang Xiaoming Sun Zifeng Yan State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China Department of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China Department of Chemistry Institute of Humanities and applied ScienceGLA UniversityMathura-281406India

Carbon materials featuring hierarchical pores and atomically dispersed metal sites are promising catalysts for energy storage and conversion ***,we developed a facile strategy to construct functional carbon materials with a fluffy peony-like structure and dense binary FeCo-Nx active sites(termed as f-FeCo-CNT).By regulating the metal content in precursors,a three-dimensional(3D)interconnected conductive carbon nanotubes network was in-situ formed throughout the atomically dispersed FeCo-NC matrix during *** advantage of rich pore hierarchy and co-existence of highly active FeCo-Nx sites and beneficial FeCo alloy nanoparticles,the f-FeCo-CNT material exhibited excellent bifunctional performance towards oxygen reduction reaction/oxygen evolution reactions(ORR/OER)with respect to the atomically dispersed FeCo-NC(SA-f-FeCo-NC)and commercial Pt/C+Ru02 mixture,surpassing the SA-f-FeCo-NC with a 20 mV higher ORR half-wave potential and a 100 mV lower OER overpotential(at 10.0 mA/cm^2).Remarkably,the f-FeCo-CNT-assembled Zn-air battery(ZAB)possessed a maximum specific power of 195.8 mW/cm^2,excellent rate capability,and very good cycling stability at large current density of 20.0 mA/cm^*** work provides a facile and feasible synthetic strategy of constructing low-cost cathode materials with excellent comprehensive ZAB performance.

关键词： atom ically dispersed catalyst hierarchical structure carbon nanotube oxygen electrocatalyst rechargeable zinc-air battery

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