期刊
SMALL
卷 10, 期 13, 页码 2618-2624出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201303926
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资金
- National Basic Research Program of China [2012CB933104]
- National Natural Science Foundation of China [11274145, 11034004]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1251]
- Fundamental Research Funds for the Central Universities [lzujbky-2013-19, 2022013zrct01]
- Scholarship Award for Excellent Doctoral Student - Ministry of Education of China
An alternative routine is presented by constructing a novel architecture, conductive metal/transition oxide (Co@Co3O4) core-shell three-dimensional nano-network (3DN) by surface oxidating Co 3DN in situ, for high-performance electrochemical capacitors. It is found that the Co@Co3O4 core-shell 3DN consists of petal-like nanosheets with thickness of <10 nm interconnected forming a 3D porous nanostructure, which preserves the original morphology of Co 3DN well. X-ray photoelectron spectroscopy by polishing the specimen layer by layer reveals that the Co@Co3O4 nano-network is core-shell-like structure. In the application of electrochemical capacitors, the electrodes exhibit a high specific capacitance of 1049 F g(-1) at scan rate of 2 mV/s with capacitance retention of similar to 52.05% (546 F g(-1) at scan rate of 100 mV) and relative high areal mass density of 850 F g(-1) at areal mass of 3.52 mg/cm(2). It is believed that the good electrochemical behaviors mainly originate from its extremely high specific surface area and underneath core-Co conductive network. The high specifi c surface area enables more electroactive sites for efficient Faradaic redox reactions and thus enhances ion and electron diffusion. The underneath core-Co conductive network enables an ultrafast electron transport.
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