超级电容器
纳米片
材料科学
钴
电解质
氢氧化物
镍
电极
化学工程
兴奋剂
碳酸盐
无机化学
层状双氢氧化物
纳米技术
电化学
化学
冶金
光电子学
物理化学
工程类
作者
Qindan Xiao,Yuan Yuan,Juncheng Zhu,Zhicheng Shi,Zhong Li,Jiliang Zhu
标识
DOI:10.1016/j.jallcom.2022.165391
摘要
In this work, a facile chemical co-precipitation method to prepare nickel-cobalt layered double hydroxide (Ni, Co-LDH) is reported. Through the addition of NaHCO3, carbonate ions (CO32-) are introduced into the LDH in a controlled way. The doping of CO32- causes the original nanosheet structure to bend and interconnect, which increases the contact area between the electrode and the electrolyte, enhancing the energy storage characteristics of materials. Appropriate CO32- doping effectively increases the specific capacity of Ni, Co-LDH. When the doping ratio of carbonate is 5% (Ni, Co-LDH/CO3-5%), the specific capacity is improved from 1432 F g-1 (undoped) to 1970 F g-1 at 1 A g-1. Furthermore, the electrode exhibits satisfactory rate capability, retaining 82.8% of the specific capacity at 20 A g-1. Moreover, an asymmetric supercapacitor (ASC), assembled with Ni, Co-LDH/CO3-5% as the positive electrode and activated carbon as the negative electrode, possesses a high energy density of 54.8 Wh kg-1 at a power density of 374.9 W kg-1 and remains 80.8% after 10000 cycles at 10 A g-1, demonstrating excellent cyclic stability.
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