A. Premkumar , B. Sridevi , K.S. Mohan , RM. Gnanamuthu
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引用次数: 0
Abstract
A one-step hydrothermal method is employed to synthesize a composite of nickel-cobalt sulfide (NiCo2S4) integrated with reduced graphene oxide (rGO) as an electrode for energy storage applications in the supercapcitor. The distribution of NiCo2S4 nanoparticles on the rGO surface is optimized to be enhance the supercapacitor performance. The resulting NiCo2S4/rGO composite showed impressive electrochemical characteristics such as capacitance (C) and specific capacitance (Cs) of 1950 F g⁻¹ at a current density of 1 Ag⁻¹. Furthermore, investigation of constructing a hybrid supercapacitor (HSC) using a NiCo2S4/rGO positive electrode and a graphene oxide (GO) as negative electrode, respectively. In the configuration achieved exceptional specific energy (Es) of 41.52 W h kg⁻¹ at a specific power (Ps) of 1067 W kg⁻¹, surpassing previous NiCo2S4 based supercapacitors. The HSC maintained an Es of 36.51 Wh kg⁻¹ at a Ps of 2065 W kg⁻¹ and exhibited an outstanding cycling stability also retaining 82% of its capacitance after 3000 charge-discharge cycles. Thus, the prepared materials are findings of the NiCo2S4/rGO composite one of suitability for advanced supercapacitors.
采用一步水热法合成了硫化镍钴(NiCo2S4)与还原氧化石墨烯(rGO)作为超级电容器储能电极的复合材料。优化NiCo2S4纳米颗粒在氧化石墨烯表面的分布,以提高超级电容器的性能。所得的NiCo2S4/rGO复合材料显示出令人印象深刻的电化学特性,如电容(C)和比电容(Cs)在电流密度为1 Ag⁻¹时为1950 F g⁻¹。此外,还研究了以NiCo2S4/rGO为正极和氧化石墨烯(GO)为负极构建混合超级电容器(HSC)的方法。在这种结构中,比能(Es)达到41.52 W h kg⁻¹,比功率(Ps)达到1067 W kg⁻¹,超过了以前基于NiCo2S4的超级电容器。HSC的Es值为36.51 Wh kg⁻¹,Ps值为2065 Wh kg⁻¹,并且在3000次充放电循环后仍能保持82%的电容。因此,所制备的材料是NiCo2S4/rGO复合材料之一,适用于先进的超级电容器。
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.