Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 935, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.168107
Keywords
Dual active sites; FeCo alloy; Oxygen reduction reaction; Oxygen evolution reaction; Zinc-air battery
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In this work, catalyst with simultaneously engineered Fe-N4 and Co-N4 active sites and graphitic carbon multilayer-encapsulated FeCo alloy is developed, showing promising catalytic activity and good stability for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).
Design and synthesis of earth-abundant elements-based electrocatalysts with sufficient activity and sta-bility remain challenging for oxygen-involved electrochemical energy conversion and storage devices. In this work, catalyst with simultaneously engineered Fe-N4 and Co-N4 active sites and graphitic carbon multilayer-encapsulated FeCo alloy is developed by pyrolysis of metal salts doped G-g-C3N4. The obtained composite material exhibits promising catalytic activity and good stability for both oxygen reduction re-action (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte, as evidenced by the positive shift of half-wave potential by 44 mV compared to 20% Pt/C for ORR and the potential of 1.596 V at current density of 10 mAcm-2 for OER. In addition, the thus-assembled rechargeable zinc-air battery using the synthesized material as cathode delivers a maximum power density of 311.2 mWcm-2 with an open circuit potential of 1.51 V and a long-term cycling stability. DFT calculation results indicate that catalyst with composite active sites displays smaller energy barrier than that with single active site.(c) 2022 Elsevier B.V. All rights reserved.
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