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Synthesis of Mesoporous Co2+-Doped TiO2 Nanodisks Derived from Metal Organic Frameworks with Improved Sodium Storage Performance

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journal contribution
posted on 11.07.2017, 00:00 by Zhensheng Hong, Meiling Kang, Xiaohui Chen, Kaiqiang Zhou, Zhigao Huang, Mingdeng Wei
TiO2 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 Co2+-doped TiO2 through the thermal treatment of metal organic frameworks precursors of MIL-125­(Ti)-Co as a superior anode material for NIBs. The Co2+-doped TiO2 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 Co2+ doping in mesoporous TiO2 anode. Co2+-doped mesoporous TiO2 nanodisks exhibited a high reversible capacity of 232 mAhg–1 at 0.1 Ag1–, good rate capability and cycling stability with a stable capacity of about 140 mAhg–1 at 0.5 Ag1– after 500 cycles. The enhanced Na-ion storage performance could be due to the increased electrical conductivity revealed by Kelvin probe force microscopy measurements.