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.本文通过简易水热法结合硫化工艺，采用不同硫化源合成了多孔NiCo₂S₄/碳纳米管（CNTs）纳米复合材料。通过对比两种不同硫化源，以硫代乙酰胺作为硫化源制备的样品展现出更优异的电化学性能：在1 A/g的电流密度下比电容高达1765 F/g，且在2 M氢氧化钾（KOH）水性电解液中，于10 A/g的高电流密度下经5000次循环后，仍可保持71.7%的电容保持率，循环稳定性优异。此外，本研究成功制备了以NiCo₂S₄/CNTs电极为正极、石墨烯为负极的非对称超级电容器（ASC）器件。该器件在功率密度为812 W/kg时，最大能量密度可达29.44 Wh/kg；即便在8006 W/kg的高功率密度下，其能量密度仍可达16.68 Wh/kg。再者，该ASC在5 A/g的电流密度下经5000次循环后，电容保持率仍达89.8%。上述研究结果表明，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。