纳米片
超级电容器
材料科学
电极
电容
纳米技术
电流密度
电化学
功率密度
化学工程
储能
多孔性
复合材料
化学
工程类
物理化学
功率(物理)
物理
量子力学
作者
Fuyong Ren,Zhixiang Tong,Shufen Tan,Junnan Yao,Lijun Pei,Yajun Ji,Abulikemu Abulizi
出处
期刊:Journal of electrochemical energy conversion and storage
[ASME International]
日期:2022-02-01
卷期号:19 (1)
被引量:2
摘要
Abstract It is well known that designing unique morphology and the structure of electrode materials is an effective strategy to achieve high-performance supercapacitors (SC). Herein, the ultrathin and porous NiCo2O4 nanosheet-based three-dimensional (3D) hierarchical electrode materials were synthesized via a simple and cost-effective solvothermal method and subsequent annealing process. Since the ultrathin and porous nanosheets could accelerate the transmission of ions and provide numerous active sites, the obtained NiCo2O4 nanosheet-based electrode exhibited great electrochemical performance with a high area capacity of 5.38 F/cm2 (2690 F/g1) at a current density of 10 mA/cm2 and good rate performance of 41% capacitance retention at 50 mA/cm2. Furthermore, the corresponding asymmetry supercapacitor was assembled by using the resulted NiCo2O4 nanosheets and active carbon as a positive electrode and a negative electrode, respectively. As expected, the corresponding supercapacitor delivered a superior energy density of 52.6 Wh/kg at a power density of 1.1 kW/kg and extraordinary capacitive retention of 80.9% after 3000 cycles at 20 mA/cm2. The high-energy storage performances suggested that the obtained ultrathin and porous NiCo2O4 nanosheet-based 3D hierarchical electrode materials could be a prospective candidate in the field of energy storage.
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