School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.
Nanoscale. 2018 Aug 7;10(29):14165-14170. doi: 10.1039/c8nr03495h. Epub 2018 Jul 16.
Orthorhombic NbO (T-NbO) nanocrystallites are successfully fabricated through an evaporation induced self-assembly (EISA) method guided by a commercialised triblock copolymer - Pluronic F127. We demonstrate a morphology transition of T-NbO from continuous porous nanofilms to monodisperse nanoparticles by changing the content of Pluronic F127. The electrochemical results show that the optimized monodisperse Nb-2 with a particle size of 20 nm achieves premier Li-ion intercalation kinetics and higher rate capability than mesoporous T-NbO nanofilms. Nb-2 presents an initial intercalation capacity of 528 and 451 C g at current densities of 0.5 and 5 A g and exhibited a stable capacity of 499 C g after 300 charge/discharge cycles and 380 C g after 1000 cycles, respectively. We would expect this copolymer guided monodispersion of T-NbO nanoparticles with high Li intercalation performance to open up a new window for novel EES technologies.
通过商业化的三嵌段共聚物 Pluronic F127 引导的蒸发诱导自组装（EISA）方法成功制备了正交 NbO（T-NbO）纳米晶。我们通过改变 Pluronic F127 的含量，证明了 T-NbO 的形貌从连续多孔纳米薄膜到单分散纳米颗粒的转变。电化学结果表明，优化后的粒径为 20nm 的单分散 Nb-2 具有优异的锂离子嵌入动力学性能和比介孔 T-NbO 纳米薄膜更高的倍率性能。Nb-2 在电流密度为 0.5 和 5A/g 时的初始嵌入容量分别为 528 和 451C/g，在 300 次充放电循环后稳定容量为 499C/g，在 1000 次循环后稳定容量为 380C/g。我们预计这种具有高锂离子嵌入性能的共聚物引导的 T-NbO 纳米颗粒的单分散性将为新型 EES 技术开辟新的窗口。
