Data from: Facile synthesis of NiCo2S4/CNTs nanocomposites for high-performance supercapacitors

Herein, porous NiCo2S4/CNTs nanocomposites were synthesized via a simple hydrothermal method followed by the sulfurization process using different sulfide sources. By comparing two different sulfur sources, the samples using thioacetamide as sulfide source delivered more remarkable electrochemical performance with a high specific capacitance of 1765 F/g at 1 A/g and an admirable cycling stability with capacitance retention of 71.7% at a high current density of 10 A/g after 5000 cycles in 2 M KOH aqueous electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device was successfully fabricated with the NiCo2S4/CNTs electrode as the positive electrode and graphene as the negative electrode. The device provided a maximum energy density of 29.44 Wh/kg at a power density of 812 W/kg. Even at a high power density of 8006 W/kg, the energy density still reaches 16.68 Wh/kg. Moreover, the ASC presents 89.8% specific capacitance retention after 5000 cycles at 5 A/g. These results reveal its great potential for supercapacitors in electrochemical energy storage field.

本研究通过简易水热法结合硫化工艺，以不同硫源制备了多孔NiCo2S4/碳纳米管（CNTs）纳米复合材料。通过对比两种不同硫源，发现以硫代乙酰胺作为硫源的样品展现出更优异的电化学性能：在1 A/g的电流密度下，其比电容高达1765 F/g；在2 M KOH水性电解质中，经5000次循环后于10 A/g的高电流密度下仍保持71.7%的电容保持率，循环稳定性出色。进一步，本研究以NiCo2S4/CNTs为正极、石墨烯为负极，成功构筑了非对称超级电容器（ASC）器件。该器件在812 W/kg的功率密度下，实现了29.44 Wh/kg的最大能量密度；即便在8006 W/kg的高功率密度下，能量密度仍可达16.68 Wh/kg。此外，该ASC器件在5 A/g的电流密度下经5000次循环后，比电容保持率达89.8%。上述结果表明，该材料在电化学储能领域的超级电容器应用中具备巨大潜力。