Long-Life Rechargeable Zn Air Battery Based on Binary Metal Carbide Armored by Nitrogen-Doped Carbon
- Authors
- Lin, Chao; Li, Xiaopeng; Shinde, Sambhaji S.; Kim, Dong-Hyung; Song, Xiaokai; Zhang, Haojie; Lee, Jung-Ho
- Issue Date
- Mar-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- metal carbide; metal organic framework (MOP); rechargeable Zn air battery; bifunctional electrocatalyst; armored electrocatalyst
- Citation
- ACS Applied Energy Materials, v.2, no.3, pp.1747 - 1755
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Energy Materials
- Volume
- 2
- Number
- 3
- Start Page
- 1747
- End Page
- 1755
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/3463
- DOI
- 10.1021/acsaem.8b01865
- ISSN
- 2574-0962
- Abstract
- Developing low-cost and high-performance bifunctional oxygen electrocatalysts is essential for commercial realization of regenerative fuel cells and rechargeable metal air batteries. Iron carbide (Fe3C) is an ideal electrocatalyst candidate; however, its poor oxygen evolution reaction (OER) activity and stability make it serve only as a unifunctional oxygen reduction reaction (ORR) electrocatalyst. Here, we report a robust bifunctional electrocatalyst consisting of manganese-iron binary carbide (MnxFe3-xC) nanoparticles armored by nitrogen-doped graphitic carbon (MnxFe3-xC/NC). Synthesis involved facile pyrolysis of a trimetallic (Fe, Mn, Zn) zeolitic imidazolate framework. Incorporation of Mn modulated the electronic properties of Fe3C and the surrounding carbon, enhancing ORR and OER activities. MnxFe3-xC, well-armored by carbon layers, displayed high resistance to oxidation and corrosion. The assembled Zn-air battery (ZAB) exhibited a large peak power density (160 mW cm(-2) at 250 mA cm(-2)) with an energy density of up to 762 mWh g(Zn)(-1), high open-circuit voltage of 1.5 V, and impressive long-term stability over 1000 cycles, indicating that MnxFe3-xC is one of the most stable earth abundant (cobalt-free) bifunctional electrocatalysts for rechargeable ZABs currently available.
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