One-step in situ hydrothermal synthesis of layered Ni3Ge2O5(OH)4/carbon nanocomposite with superior sodium storage properties

作者:Wen, Ni; Zhang, Ke; Feng, Jingjie; Zhou, Zhiyong; Chen, Siyuan; Wang, Yang; Liu, Shenghong; Kuang, Quan; Dong, Youzhong; Zhao, Yanming*
来源:Journal of Electroanalytical Chemistry, 2021, 887: 115171.
DOI:10.1016/j.jelechem.2021.115171

摘要

Here, we employ an effective one-step hydrothermal method to synthesize layered Ni3Ge2O5(OH)(4) nanocomposite by introducing carbon matrix (Ketjen black, KB) in situ. The obtained Ni3Ge2O5(OH)(4) nanosheets are uniformly attached to the KB matrix. The layered Ni3Ge2O5(OH)(4)/KB nanocomposite inherits the mesoporous feature of the KB and the specific surface area is 314 m(2) g(-1), which is significantly higher than that of bare Ni3Ge2O5(OH)(4). As a result, layered Ni3Ge2O5(OH)(4)/KB nanocomposite exhibits a highly reversible specific capacity of nearly 580 mA h g(-1) at 50 mA g(-1) and an outstanding rate capability of around 245 mA h g(-1) at 1000 mA g(-1), which is obviously superior to that of the bare Ni3Ge2O5(OH)(4) nanosheets. The remarkable sodium storage performances of layered Ni3Ge2O5(OH)(4)/KB nanocomposite should be assigned to the KB, which acts as a conductive matrix and uniformly adheres to the Ni3Ge2O5(OH)(4) nanosheets, further increasing the specific surface area, improving electronic conductivity, and accommodating volume change during cycling.