期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 9, 页码 3362-3370出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta10002j
关键词
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资金
- Thousands Talents program for the pioneer researcher and his innovation team, China
- National Science Foundation of China [51374029]
- National Science Foundation (NSF) [DMR-1505902]
- Program for New Century Excellent Talents in University [NCET-13-0668]
- Fundamental Research Funds for the Central Universities [FRF-TP-14-008C1]
- China Postdoctoral Science Foundation [2015M570987]
MnO nanoparticles with cationic vacancies and discrepant crystallinity were prepared through a one-step hydrothermal synthesis followed by calcination at different temperatures. Glucose was used as both a reducing agent to introduce cationic vacancies with a content of similar to 5.5% into MnO nanocrystals, and a carbon source to encapsulate MnO nanocrystals in a three dimensional porous framework. Cationic vacancies benefit phase transition in a conversion reaction, and together with a low degree of crystallinity, may also provide more void spaces for ion diffusion (3.37 x 10(-13) cm(2) s(-1)). Three dimensional porous carbon with a pore volume of 0.27 cm(3) g(-1) demonstrated a high electrical conductivity of 6.25 S cm(-1) and offered fast pathways for charge transfer and penetration of the electrolyte. Such a synergistic structure endowed MnO with excellent electrochemical properties including a considerably enhanced capacity of 650 mA h g(-1) at a current density of 1000 mA g(-1). Li ion capacitors based on such a MnO anode and activated carbon cathode achieved the maximum energy density of 220 W h kg(-1), and the capacitance retention was 95.3% after 3600 cycles at a rate of 5000 mA g(-1).
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