Liu Huiqiao, Cao Kangzhe, Xu Xiaohong, Jiao Lifang, Wang Yijing, Yuan Huatang
Institute of New Energy Material Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin Key Lab of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11239-45. doi: 10.1021/acsami.5b02724. Epub 2015 May 22.
To inhibit the aggregation of TiO2 nanoparticles and to improve the electrochemical kinetics of TiO2 electrode, a hybrid material of ultrasmall TiO2 nanoparticles in situ grown on rGO nanosheets was obtained by ultraphonic and reflux methods. The size of the TiO2 particles was controlled about 10 nm, and these particles were evenly distributed across the rGO nanosheets. When used for the anode of a sodium ion battery, the electrochemical performance of this hybrid TiO2@rGO was much improved. A capacity of 186.6 mAh g(-1) was obtained after 100 cycles at 0.1 A g(-1), and 112.2 mAh g(-1) could be maintained at 1.0 A g(-1), showing a high capacity and good rate capability. On the basis of the analysis of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), the achieved excellent electrochemical performance was mainly attributed to the synergetic effect of well-dispersed ultrasmall TiO2 nanoparticles and conductive graphene network and the improved electrochemical kinetics. The superior electrochemical performance of this hybrid material on lithium storage further confirmed the positive effect of rGO.
为了抑制TiO₂纳米颗粒的团聚并改善TiO₂电极的电化学动力学，通过超声和回流方法制备了一种在rGO纳米片上原位生长的超小TiO₂纳米颗粒的复合材料。TiO₂颗粒的尺寸控制在约10 nm，且这些颗粒均匀分布在rGO纳米片上。当用作钠离子电池的阳极时，这种TiO₂@rGO复合材料的电化学性能有了很大提高。在0.1 A g⁻¹下循环100次后，容量达到186.6 mAh g⁻¹，在1.0 A g⁻¹下可保持112.2 mAh g⁻¹，显示出高容量和良好的倍率性能。基于循环伏安法（CV）和电化学阻抗谱（EIS）分析，所实现的优异电化学性能主要归因于分散良好的超小TiO₂纳米颗粒与导电石墨烯网络的协同效应以及改善的电化学动力学。这种复合材料在锂存储方面的优异电化学性能进一步证实了rGO的积极作用。
