Self-assembled 3D NiCo 2 S 4 nanotubes-graphene aerogel composites as an excellent anode for Li-ion batteries

Micro & nano letters

article

Lixin Zhang¹  Qi Wang¹  Hongfang Jiu²  Chunmei Xie¹  Shaomei Zhang² 

[1] School of Chemical Engineering and Technology, North University of China;School of Science, North University of China

关键词: nickel compounds;    self-assembly;    aerogels;    nanocomposites;    electrochemical electrodes;    secondary cells;    lithium compounds;    graphene;    nanotubes;    graphene compounds;    freezing;    drying;    scanning electron microscopy;    transmission electron microscopy;    X-ray diffraction;    nanoporous materials;    current density;    self-assembled three-dimensional NGA;    anode;    Li-ion battery;    nanotube-graphene aerogel composite;    electrostatic interaction;    diallyldimethylammonium chloride-modified nanotube;    graphene oxide sheet;    GO sheet;    steerable hydrothermal process;    freeze-drying process;    scanning electron microscope;    transmission electron microscopy;    X-ray diffraction;    Brunauer-Emmett-Teller;    interconnected porous structure;    LIB;    lithium-ion battery;    current density;    NiCo2S4-CO;   

DOI  :  10.1049/mnl.2017.0920

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

In recent years, observed focus greatly on gold nanoparticles synthesis due to its unique properties and tremendous applicability. In most of these researches, the citrate reduction method has been adopted. The aim of this study was to prepare and optimize monodisperse ultrafine particles by addition of reducing agent to gold salt, as a result of seed mediated growth mechanism. In this research, gold nanoparticles suspension (G) was prepared by traditional standard Turkevich method and optimized by studying different variables such as reactants concentrations, preparation temperature and stirring rate on controlling size and uniformity of nanoparticles through preparing twenty formulas (G1-G20). Subsequently, the selected formula that prepared from the best tested condition was further optimized by preparing it using inverse method via the addition of gold salt to the reducing agent in opposite to the previous traditional method (G21). The optimized gold nanoparticles were characterized by SEM, EDX, TEM and zeta potential. The obtained results indicated that (G21) with reactants concentrations of 0.5mM and 10mM for HAuCl4.3H2O and trisodium citrate dihydrate respectively, 65°C of preparation temperature and 1500rpm of stirring rate was chosen as an optimized formula according to AFM provided gold nanoparticles with smoother surface, smaller size (average 8.75nm) with more uniform size distribution (7.32%) as well as short over all preparation time (27minutes). In addition to that all results of SEM, EDX and TEM indicated uniform spherical shape with zeta potential of -47.87. In conclusion, inversed method is promising for the preparation of gold nanoparticles with high monodispersity.

【 授权许可】

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