In-situ growth of core-shell NiCo2O4@Ni-Co layered double hydroxides for all-solid-state flexible hybrid supercapacitor

超级电容器 材料科学 电容 电极 电解质 层状双氢氧化物 煅烧 电流密度 氢氧化物 功率密度 化学工程 纳米技术 阳极 化学 催化作用 功率(物理) 量子力学 生物化学 物理 工程类 物理化学
作者
Zhengxu Chen,Yingli Li,Zeyuan Hu,Yidong Miao,Yanwei Sui,Jiqiu Qi,Fuxiang Wei,Yaojian Ren,Zhigang Zhan,Jinlong Liu,Zhi Sun,Meihua Zhou,Dongmei Meng
出处
期刊:Colloids and Surfaces A: Physicochemical and Engineering Aspects [Elsevier BV]
卷期号:607: 125417-125417 被引量:21
标识
DOI:10.1016/j.colsurfa.2020.125417
摘要

In recent years, the core-shell heterostructure has been considered as one of the most promising candidates for the next generation of electrode materials, which can not only shorten the ion diffusion distance, but also increase the contact area between the electrode and the electrolyte. Herein, two different morphologies of NiCo2O4 nanomaterials were prepared by hydrothermal-calcination method, and then the hybrid structure consisting of needle-like NiCo2O4 core and Ni-Co layered double hydroxide (Ni-Co LDH) shell is composited on carbon fiber cloth (CFC) by constant current electrodeposition as electrode materials. The resultant NiCo2O4@Ni-Co LDH core-shell hybrid arrays exhibits the specific capacitance of 4901.8 m F cm−2 at the current density of 2 mA cm−2, which is much higher than that of needle NiCo2O4 and flake Ni-Co LDH. At the same time, the obtained NiCo2O4@Ni-Co LDH as the positive electrode while the activated (AC) serves as the negative electrode, which is used to assemble the all-solid flexible asymmetric supercapacitor. It delivers an energy density of 0.859 mW h cm-3 at the power density of 2 mA cm−2, as well as an excellent cycling performance with capacitance retention of 92.3 % after 5000 cycles at 16 mA cm−2. These results suggest that this core-shell structured material could be a promising electrode for supercapacitors.

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