Long-Life
Rechargeable Zn Air Battery Based on Binary
Metal Carbide Armored by Nitrogen-Doped Carbon
Chao Lin
Xiaopeng Li
Sambhaji S. Shinde
Dong-Hyung Kim
Xiaokai Song
Haojie Zhang
Jung-Ho Lee
10.1021/acsaem.8b01865.s001
https://acs.figshare.com/articles/journal_contribution/Long-Life_Rechargeable_Zn_Air_Battery_Based_on_Binary_Metal_Carbide_Armored_by_Nitrogen-Doped_Carbon/7646993
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 (Fe<sub>3</sub>C) 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 (Mn<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>C) nanoparticles armored
by nitrogen-doped graphitic carbon (Mn<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>C/NC). Synthesis involved
facile pyrolysis of a trimetallic (Fe, Mn, Zn) zeolitic imidazolate
framework. Incorporation of Mn modulated the electronic properties
of Fe<sub>3</sub>C and the surrounding carbon, enhancing ORR and OER
activities. Mn<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>C, 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<sup>–2</sup> at 250 mA cm<sup>–2</sup>) with an energy density of up to
762 mWh g<sub>Zn</sub><sup>–1</sup>, high open-circuit voltage
of 1.5 V, and impressive long-term stability over 1000 cycles, indicating
that Mn<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>C is one of the most stable earth abundant (cobalt-free) bifunctional
electrocatalysts for rechargeable ZABs currently available.
2019-01-16 00:00:00
Binary Metal Carbide Armored
carbon layers
bifunctional electrocatalyst
open-circuit voltage
bifunctional oxygen electrocatalysts
Nitrogen-Doped Carbon
zeolitic imidazolate framework
regenerative fuel cells
Zn-air battery
OER activities
ZAB
1.5 V
metal air batteries
Mn
iron carbide
Fe 3 C
oxygen evolution reaction
energy density
Long-Life Rechargeable Zn Air Battery
electrocatalyst candidate
ORR
1000 cycles
nitrogen-doped graphitic carbon
bifunctional electrocatalysts
unifunctional oxygen reduction reaction