期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 9, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac8edb
关键词
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资金
- Graduate Scientific Research Innovation Project of Central South University [2021XQLH008]
- R & D of Key Technology of Light Metal Air Battery, Transformation and Industrialization of Scientific and Technological Achievements of Hunan Province [2020GK2071]
- R & D of Key Technology and Materials of Magnesium Air Battery, Transformation of Scientific and Technological Achievements of Chang Sha City [Kh2005186]
- Technical Area Fund of Foundation Strengthening [2021-JCJQ-JJ-0432]
In this study, MnO2/CeO2 electrocatalysts were synthesized by in situ decoration of alpha-MnO2 with CeO2 particles, showing improved performance in the oxygen reduction reaction and Mg-air battery applications. The control of the molar ratio of Ce3+/Mn7+ in the precursor allowed for increased surface area and catalytic active sites, leading to excellent four-electron transfer process and long-term stability.
In this work, we synthesized MnO2/CeO2 electrocatalysts by in situ decoration of alpha-MnO2 with CeO2 particles during a one-step hydrothermal process. The morphology, composition, and electrochemical properties were studied in the context of application to the oxygen reduction reaction (ORR) and Mg-air battery. According to the results, alpha-MnO2/CeO2 microfibres exhibited better ORR performance than alpha-MnO2 microfibres due to the synergistic result between the introduction of Ce3+ in CeO2 lattice and the enhancement of Mn3+ content in MnO2 lattice. alpha-MnO2/CeO2 microfibres provided a higher surface area and more catalytic active sites than alpha-MnO2 microfibres by controlling the molar ratio of Ce3+/Mn7+ for the precursor. When the mole ratio of Ce3+ and Mn7+ in the precursors was 10%, the four-electron transfer process of the MnO2/CeO2 microfibres (MC-140-12-10) was found to be similar to that of the 20 wt% Pt/C commercial catalysts. MC-140-12-10 microfibres also showed the excellent long-term stability after 25,000 s and superior Mg-air battery performances than alpha-MnO2. Hence, the work paves the way for developing Mg-air batteries through a simple synthesis and cost-effective ORR catalyst.
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