超级电容器
量子点
硫化镍
材料科学
复合数
塔菲尔方程
电容
镍
碳纤维
纳米技术
热液循环
纳米结构
硫化物
碳量子点
化学工程
电化学
电极
复合材料
冶金
化学
物理化学
工程类
作者
Saumyaranjan Sahoo,Ashis Kumar Satpati,Prasanta Kumar Sahoo,Prakash D. Naik
出处
期刊:ACS omega
[American Chemical Society]
日期:2018-12-20
卷期号:3 (12): 17936-17946
被引量:92
标识
DOI:10.1021/acsomega.8b01238
摘要
A facile hydrothermal method is adopted for the synthesis of hierarchical flowerlike nickel sulfide nanostructure materials and their composite with carbon quantum dot (NiS/C-dot) composite. The composite material exhibited good performance for electrochemical energy-storage devices as supercapacitor with a specific capacity of 880 F g-1 at a current density of 2 A g-1. The material remained stable up to the tested 2000 charge-discharge cycles. Carbon quantum dots of size 1.3 nm were synthesized from natural sources and the favorable electronic and surface property of C-dots were utilized for improvement of the supercapacitor performance of NiS. The results from Tafel analysis, double-layer capacitance, and the impedance measurement reveal that the incorporation of C-dots inside the NiS matrix has improved the charge-transfer process, which is mainly responsible for the enhancement of the supercapacitive property of the composite materials.
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