Journal
NANO RESEARCH
Volume 13, Issue 4, Pages 1090-1099Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2751-7
Keywords
atomically dispersed catalyst; hierarchical structure; carbon nanotube; oxygen electrocatalyst; rechargeable zinc-air battery
Categories
Funding
- National Natural Science Foundation of China [21701101]
- National Key Research and Development Project [2018YFE0118200, 2016YFF0204402]
- Fundamental Research Funds for the Central Universities [18CX06063A]
- Ministry of Finance
- Ministry of Education of China
- Shandong Key Research and Development Project [2019JZZY010506]
- Shandong Scientific Research Awards Foundation for Outstanding Young Scientists [ZR2018JL010]
- Shandong Joint Fund of Outstanding Young Talents [ZR2017BB018]
- Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2017RCJJ059]
- Program for Tsingtao Al-ion Power and Energy-Storage Battery Research Team in the University [17-2-1-1-zhc]
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Carbon materials featuring hierarchical pores and atomically dispersed metal sites are promising catalysts for energy storage and conversion applications. Herein, we developed a facile strategy to construct functional carbon materials with a fluffy peony-like structure and dense binary FeCo-N-x 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 pyrolysis. Taking advantage of rich pore hierarchy and co-existence of highly active FeCo-N-x 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+RuO2 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(2). This work provides a facile and feasible synthetic strategy of constructing low-cost cathode materials with excellent comprehensive ZAB performance.
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