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Long-Life Rechargeable Zn Air Battery Based on Binary Metal Carbide Armored by Nitrogen-Doped Carbon
journal contribution
posted on 2019-01-16, 00:00 authored by Chao Lin, Xiaopeng Li, Sambhaji S. Shinde, Dong-Hyung Kim, Xiaokai Song, Haojie Zhang, Jung-Ho LeeDeveloping
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 gZn–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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Binary Metal Carbide Armoredcarbon layersbifunctional electrocatalystopen-circuit voltagebifunctional oxygen electrocatalystsNitrogen-Doped Carbonzeolitic imidazolate frameworkregenerative fuel cellsZn-air batteryOER activitiesZAB1.5 Vmetal air batteriesMniron carbideFe 3 Coxygen evolution reactionenergy densityLong-Life Rechargeable Zn Air Batteryelectrocatalyst candidateORR1000 cyclesnitrogen-doped graphitic carbonbifunctional electrocatalystsunifunctional oxygen reduction reaction
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