超级电容器
尿素
氢氧化物
材料科学
电镀
化学工程
比能量
储能
化学
层状双氢氧化物
电化学
无机化学
核化学
电容
纳米技术
电极
有机化学
功率(物理)
物理化学
工程类
物理
量子力学
图层(电子)
作者
Tianbao Liu,Hanfeng Zhou,Guoxiong Zhong,Xianliang Yan,Xintai Su,Lin Zhang
标识
DOI:10.1016/j.jhazmat.2020.124113
摘要
This work demonstrated that electroplating sludges (EPS) of specific composition may be used for the synthesis of layered double hydroxide (LDH) materials for energy applications after appropriate treatment. The unique composition and structure of EPS render it with good electrochemical energy storage performance. The EPS containing Ni, Fe, and Al was dissolved by acid and added with urea precipitator. The LDH material was prepared by a facile hydrothermal method. The increase of urea in a certain range is conducive to the formation of intact LDH. However excessive urea levels promoted the transformation from LDH to Ni(HCO3)2. Various active Ni bridged by N in ‒O‒CN promoted electron transfer, ‒O‒CN content in LDHs was proportional to the urea amount. The prepared LDHs exhibited a specific capacitance of 1652.20 F g−1 at 0.5 A g−1, and the value remained at 766.69 F g−1 after 1000 cycles. The prepared LDH has excellent supercapacitor performance, which is closely related to its structure. Therefore, the proposed recycling strategy of EPS resources can be used to prepare LDH supercapacitors, paving the way for new applications of EPS in the field of energy storage.
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