期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 15, 期 22, 页码 8831-8837出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp44707c
关键词
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资金
- National Natural Science Foundation of China [21173021, 21231002, 21276026, 21271023, 91022006, 20973023]
- 111 Project [B07012]
- Program of Cooperation of the Beijing Education Commission [20091739006]
- specialized research fund for the doctoral program of higher education (SRFDP) [20101101110031]
Large-scale MoO2/carbon composites with a cage-like nanostructure have been synthesized by a simple hydrothermal reduction process. During the hydrothermal process, ammonium molybdate tetrahydrate ((NH4)(6)Mo7O24 center dot 4H(2)O) was employed as starting material and ascorbic acid as a structure directing agent, reductive agent and carbon source. MoO2/C nanospheres with diameters of about 15-25 nm were interconnected to form a cage-like architecture. Time-dependent experiments illustrated that the cage-like structure was transformed from tightly packed MoO2 nanoparticles. Furthermore, with a water-soluble binder (sodium alginate), the cage-like MoO2/C composites exhibited a high discharge capacity and significantly improved cycling performance compared to previously reported MoO2-based anode materials. The electrodes with the MoO2/C composites can deliver a capacity of 692.5 mA h g(-1) after 80 charge-discharge cycles at a current density of 200 mA g(-1). After C-rate measurement, the battery still can maintain excellent cycling stability (about 550 mA h g(-1) reversible capacity retained even after 475 cycles). The excellent electrochemical performance can be ascribed to the cage-like structure, which integrates three advantages: porous structure, interconnected MoO2/C framework and small nano-crystals.
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