Ni-doped Mn2O3 microspheres as highly efficient electrocatalyst for oxygen reduction reaction and Zn-air battery
| Autor: | Kyeongseok Min, Sung-Hyeon Baeck, Sang Eun Shim, Dongwook Lim, Hongjae Kim |
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| Rok vydání: | 2022 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Coprecipitation Metal ions in aqueous solution Limiting current Energy Engineering and Power Technology Condensed Matter Physics Electrocatalyst Cathode Energy storage law.invention Catalysis Fuel Technology Chemical engineering law |
| Zdroj: | International Journal of Hydrogen Energy. 47:2378-2388 |
| ISSN: | 0360-3199 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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