Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 4, Pages 2908-2914Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp07569j
Keywords
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Funding
- Natural Science Foundation of China [U1303191, 21403295, 51663016]
- Western Light'' Foundation of CAS [XBBS201320]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2015BAD14B06]
- Natural Science Foundation of Jiangxi Province [2016BAB203075, 20162BCB23015]
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Flexible and freestanding MoO2/Mo2C imbedded carbon fibers (MoO2/Mo2C ICFs) have been successfully synthesized via an integrated procedure including electrospinning, thermo-plastication in air and reduction/carbonization at high temperature. A series of techniques such as SEM, TEM, N-2 adsorption-desorption analysis, XRD, TGA, IR and XPS have been employed to systemically characterize the MoO2/Mo2C ICFs. In particular, it is observed that the MoO2/Mo2C ICFs derived from phosphomolybdic acid have more highly porous structures than those derived from molybdic acid. Most impressively, the obtained MoO2/Mo2C ICFs are directly used as binder-and current collector-free anode materials for LIBs, which exhibit desirable rate capability and satisfactory cycling performance. The electrochemical investigations illustrated that the MoO2/Mo2C ICFs could deliver an initial discharging capacity of 1422.0 mA h g(-1) with an original coulombic efficiency of 63.3%, and the subsequent reversible capacity could reach as high as 1103.6 mA h g(-1) even after 70 cycles at a current density of 0.1 A g(-1). Such a capacity is larger than the theoretical capacity of MoO2 (838 mA h g(-1)) and pure carbon fibers (460.5 mA h g(-1)). More importantly, the MoO2/Mo2C ICFs exhibited an excellent rate performance with a capacity of 445.4 mA h g(-1) even at a charging current density of 1.6 A g(-1). The remarkable enhancement in rate capability and long cycling performance resulted from a synergistic effect between the MoO2 nanoparticles and porous carbon fiber matrix. This methodology can be widely extended to fabricate other metal oxide/carbon composites for significant energy storage and conversion applications.
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