Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 4, Pages 2378-2388Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.164
Keywords
Oxygen reduction reaction; Zn-air battery; Transition metal oxide; Heteroatom doping; Electrocatalyst
Categories
Funding
- Korea Institute for Advancement of Technology
- Ministry of Trade, Industry and Energy of the Republic of Korea [P0017363]
- Korea Basic Science Institute (National research Facilities and Equipment Center) - Ministry of Education [2021R1A6C101A404]
- National Research Foundation of Korea [2021R1A6C101A404] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ni-doped Mn2O3 microspheres were successfully synthesized via a facile method and showed exceptional catalytic performance in the oxygen reduction reaction and potential applications in Zn-air batteries. The superior performance of the material can be attributed to its hierarchical structure, optimized particle size, and Ni incorporation into Mn2O3, providing a new methodology for efficient electrocatalysts design.
Herein, Ni-doped Mn2O3 microspheres are successfully synthesized via the facile coprecipitation of metal ions and ammonium bicarbonates, followed by a heat treatment process. Ni-doped Mn2O3 exhibits outstanding catalytic performance toward the oxygen reduction reaction (ORR) in alkaline media with a half-wave potential of 0.801 V, limiting current density of 6.02 mA cm(-2) at 0.6 V vs. RHE, outstanding long-term durability, and strong tolerance to methanol. Furthermore, a Zn-air primary battery using Ni-doped Mn2O3 as an air cathode shows high open-circuit voltage of 1.52 V and high power density of 88.2 mW cm(-2), outperforming the commercial Pt/C cathode. The exceptional performance of the Ni-doped Mn2O3 microspheres is ascribed to the hierarchical structure, optimized particle size, and Ni incorporation into Mn2O3. The proposed synthesis strategy provides a new methodology for the design and fabrication of electrochemically active transition metal-doped materials as efficient electrocatalysts for a variety of energy storage and conversion reactions. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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