期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 37, 页码 32071-32079出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b06290
关键词
TiO2; Co2+ doping; MOP; sodium-ion batteries; anode
资金
- National Natural Science Foundation of China [NSFC 51502038, U1505241]
- National Science Foundation of Fujian Province [2015J01042]
- Education Department of Fujian Province [JA14081]
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.
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