材料科学
超级电容器
纳米点
电解质
纳米花
电容
化学工程
电极
纳米技术
重量分析
化学
纳米结构
工程类
物理化学
有机化学
作者
Zengcai Guo,Junpeng Wang,Jingbo Mu,Aifeng Liu,Feng Li,Hang Yang,Zhongkai Huang,Yanming Wang
出处
期刊:Fuel
[Elsevier]
日期:2024-02-01
卷期号:357: 129818-129818
被引量:9
标识
DOI:10.1016/j.fuel.2023.129818
摘要
The low energy density of SCs (<10 Wh kg−1) severely limits their commercial application, increasing either specific capacitance or broadening the potential window of the device is the effective pathway to improve the device energy density. Herein, nitrogen-doped carbon capsule (NC) supported Ag nanodots-decorated CoMn2O4 nanoflower (NC/CoMn2O4/Ag) electrode material has been successfully designed and synthesized. NC/CoMn2O4/Ag exhibits superior discharge capacity of 1806.4C/g, superior to NC/CoMn2O4 electrode (without Ag nanodots, 1319.2C/g at 1 A g−1). Theoretical calculations analysis demonstrates that decorated Ag nanodots on CoMn2O4 plays a fundamental role in improving the band gap, electrical conductivity, diffusion and transfer of electrolyte ions. In addition, asymmetric gel electrolytes of PVA-Na2SO4//PVA-KOH were designed for the assembly of asymmetric devices. This device delivers gravimetric energy density up to 89.9 Wh kg−1 at 894 W kg−1. The device can reach a large electrochemical voltage of up to 2.3 V, which could drive a remote-controlled toy easily. This work showcases a promising approach to rationally design conductive nanodots-decorated transition metal oxide-based materials towards high energy density supercapacitors. And it also sheds light on an in-depth understanding of their charge storage mechanisms.
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