期刊
CHEMICAL ENGINEERING JOURNAL
卷 417, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129186
关键词
Bulk oxygen vacancies; Enhanced electrical conductivity; Local electric field; MnO2; Supercapacitor
资金
- National Natural Science Foundation of China [21575016]
- National Program for Support of Top-notch Young Professionals
- National Natural Science Foundation of China Youth Program [21802076]
- National Natural Science Foundation of China Regional Program [21962013]
The successful introduction of rich bulk oxygen vacancies in MnO2 enhances electrical conductivity, promotes charge transfer, and significantly improves capacitance and rate capability. The asymmetric supercapacitor of MnO2 with rich bulk oxygen vacancies exhibits higher energy density and power density compared to most reported MnO2-based supercapacitors.
Transition metal oxides with high theoretical capacity are known to show greatly limited energy and power density of electrochemical energy storage due to its sluggish charge transfer kinetics. Although oxygen vacancies at atomic level can efficiently regulate electronic configuration and ameliorate electrochemical performance, the construction of rich bulk oxygen vacancies is still a challenge. Here, rich oxygen vacancies were successfully introduced in bulk MnO2 through complex induced chemical precipitation. Enhanced electrical conductivity and local electric-field formed around oxygen vacancies promote the charge transfer, remarkably enhancing capacitance and rate capability. Asymmetric supercapacitor of MnO2 with rich bulk oxygen vacancies exhibits high energy density (54.2 Wh kg(-1)) and power density (3279.6 W kg(-1)), superior to most reported MnO2-based supercapacitor. Our strategy paves a way for the fine regulation of bulk electronic configuration and reaction kinetics.
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