期刊
CRYSTAL GROWTH & DESIGN
卷 16, 期 11, 页码 6605-6612出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.6b01293
关键词
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资金
- National Natural Science Foundation of China [NSFC 51502038, 21173049, U1505241]
- Research Fund for the Doctoral Program of Higher Education of China [RFDP 20133514110002]
- National Science Foundation of Fujian Province [2015J01042]
- Education Department of Fujian Province [JA14081]
With the aim of enhancing the electrochemical kinetics and capacity of the TiO2 electrode for Na ion batteries (NIBs), we have designed a hybrid material of carbon-coated TiO2 mesocrystals anchored on reduced graphene oxide (TiO2@C-rGO). Such hybrid nanostructures are fabricated through a facile one-step route including in situ growth of oriented self assembly of TiO2 mesocrystals on GO. TiO2@C-rGO possesses a very large surface area (279 m(2) g(-1)), mesoporous nature, and single-crystal-like structure. It is also found that the capacity of TiO2 electrode for NIBs could be improved by carbon coating at a low current rate, but pure TiO2 shows better rate performance than that of TiO2@C. Remarkably, the enhanced electrochemical kinetics and large capacity can be simultaneously achieved by designing,hybrid material. The hybrid nanostructures exhibit a highly reversible capacity of 300 mAh g(-1) at 100 mA g(-1), superior rate capability, and long-term cycling stability (a stable capacity of 159 mAh g-1- can be maintained after 1000 cycles at 1 A g(-1)). The superior Na ion storage of TiO2@C-rGO is largely ascribed to the robust architecture of well-dispersed carbon-coated mesoporous TiO2 mesocrystals anchored on conductive graphene network, leading to enhanced electrochemical kinetics and offering enough active sites for the Na ion to locate.
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