超级电容器
材料科学
纳米材料
电化学
电容
复合数
热液循环
纳米技术
电极
异质结
电流密度
层状双氢氧化物
过渡金属
比表面积
镍
化学工程
化学
催化作用
光电子学
复合材料
冶金
生物化学
物理
物理化学
量子力学
工程类
氢氧化物
作者
Jianfeng Dai,Ren‐Sheng Xu,Bin Cai,Hal-Bon Gu,Limei Zhang,Xue Yang,Hao Shen,Guosong Liu
标识
DOI:10.1016/j.electacta.2023.143542
摘要
Transition metal hydroxides have attracted wide attention as promising composite nanomaterials due to their numerous active sites and large specific surface areas. In this study, a two-step hydrothermal synthesis method is proposed to generate a heterostructure (NiCoZn-LDH@NiMoO4@NF) consisting of nanoflowers coated with nanoneedles on a foam nickel substrate. The aggregation issue of NiCoZn-LDH is effectively improved by immersing it in CTAB solution after one-step hydrothermal synthesis of NiMoO4 nanoneedles on Ni Foam (NF). The heterostructure between NiMoO4 nanoneedles and NiCoZn-LDH significantly enhances the material stability and electrochemical performance. Activated carbon is used as the negative electrode, and the NiCoZn-LDH@NiMoO4@NF composite material is used as the positive electrode to assemble an asymmetric supercapacitor (ASC) device for electrochemical testing. The device exhibits a specific capacitance of 3541 mF/cm2 at a current density of 6 mA/cm2. Furthermore, the capacity retention rate remains at 83.04% after 10000 cycles of charge and discharge, and a high specific energy density of 0.735 mWh/cm2 is achieved at a power density of 1.6 mW/cm2. The experimental results demonstrate that transition metal hydroxides play a crucial role in enhancing the electrochemical performance of supercapacitors. This study provides new insights into Supercapacitor (SC) active materials and offers a promising experimental approach for synthesizing new nanomaterials.
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