Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University , Fuzhou, Fujian 350117, China.
Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices , Xiamen, 361005, China.
ACS Appl Mater Interfaces. 2017 Sep 20;9(37):32071-32079. doi: 10.1021/acsami.7b06290. Epub 2017 Sep 6.
TiO is a most promising anode candidate for rechargeable Na-ion batteries (NIBs) because of its appropriate working voltage, low cost, and superior structural stability during chage/discharge process. Nevertheless, it suffers from intrinsically low electrical conductivity. Herein, we report an in situ synthesis of Co-doped TiO through the thermal treatment of metal organic frameworks precursors of MIL-125(Ti)-Co as a superior anode material for NIBs. The Co-doped TiO possesses uniform nanodisk morphology, a large surface area and mesoporous structure with narrow pore distribution. The reversible capacity, Coulombic efficiency (CE) and rate capability can be improved by Co doping in mesoporous TiO anode. Co-doped mesoporous TiO nanodisks exhibited a high reversible capacity of 232 mAhg at 0.1 Ag, good rate capability and cycling stability with a stable capacity of about 140 mAhg at 0.5 Ag after 500 cycles. The enhanced Na-ion storage performance could be due to the increased electrical conductivity revealed by Kelvin probe force microscopy measurements.
TiO 是一种很有前途的可充钠离子电池（NIBs）的阳极候选材料，因为它具有适当的工作电压、低成本和在充放电过程中的卓越结构稳定性。然而，它本身的导电性较低。在此，我们通过热解 MIL-125(Ti)-Co 金属有机框架前驱体制备了 Co 掺杂的 TiO，将其作为 NIBs 的一种优异的阳极材料进行了报道。Co 掺杂的 TiO 具有均匀的纳米盘形貌、大的比表面积和介孔结构以及窄的孔分布。Co 掺杂在介孔 TiO 阳极中可以提高可逆容量、库仑效率（CE）和倍率性能。Co 掺杂的介孔 TiO 纳米盘在 0.1Ag 时表现出 232mAhg 的高可逆容量、良好的倍率性能和循环稳定性，在 500 次循环后在 0.5Ag 时稳定容量约为 140mAhg。增强的钠离子存储性能可能归因于通过 Kelvin 探针力显微镜测量揭示的电导率的提高。
