期刊
JOURNAL OF POWER SOURCES
卷 494, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229779
关键词
Manganese dioxides; Oxygen electrocatalysts; Metal-air batteries; Fuel cells; Water splitting
资金
- National Natural Science Foundation of China [51871126]
- Ningbo major special projects of the Plan Science and Technology Innovation 2025 [2019B10043, 2020Z107]
- Zhejiang Provincial Natural Science Foundation of China [LY21E010002]
- K.C. Wong Magna Fund in Ningbo University
- Delta Electronics Inc.
- National Research Foundation (NRF) Singapore under the Corp Lab@University Scheme
Oxygen catalytic reactions play a crucial role in energy transformation and storage devices, with manganese dioxide (MnO2) standing out for its high earth-abundance, low cost, and balanced activity-stability performances. Strategies such as heteroatom doping and morphology tuning are implemented to optimize the catalytic performance of MnO2, which finds applications in metal-air batteries, fuel cells, and water splitting systems, showing promising prospects for further development.
The oxygen catalytic reactions including the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the basis of many energy transformation and storage devices, e.g., fuel cells, metal-air batteries, and electrolysis cells. Extensive trials have been invested to develop earth-abundant oxygen catalysts to lower the cost and to boost the energy efficiency of these electrochemical devices. Among these oxygen catalysts, manganese dioxide (MnO2) is attracting ever-increasing interest owing to its high earth-abundance, low cost, and well-balanced activity-stability performances. In this review, the mechanisms of ORR and OER catalysis, methods for activity enhancement, and various applications of MnO2 oxygen catalysts in energy conversion and storage are summarized and discussed. As the ORR and OER catalysts in the whole pH range, the Mn3+ intermediate in MnO2 is identified as the active center. To optimize the catalytic performance of MnO2, the strategies of heteroatom doping, morphology tuning, heterostructure forming, conductor supporting, defect engineering, and valence regulating are implemented. Moreover, the applications of MnO2 in metal-air batteries, fuel cells and water splitting systems are detailed. Lastly, some prospects of MnO2 oxygen catalysts are proposed for the further development.
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