In this work, CNTs-wrapped ZnCo₂S₄ nanoparticle composites were constructed by a simple hydrothermal process. This process allows to wrap ZnCo₂S₄ nanoparticle in an interconnected CNT matrix that combines excellent electronic conductivity with good mechanical stability. The CNTs wrapping suppresses the aggregation of ZnCo₂S₄ nanoparticle, and assures an effective contact between electrolyte and ZnCo₂S₄ particles, then promotes rapid ion transportation. Specifically, ZnCo₂S₄@CNTs (5 wt%) composite shows the highest specific surface area, lowest polarization and the highest reversibility during cycling among all samples. ZnCo₂S₄@CNTs (0, 2.5, 5 and 10 wt%) electrodes deliver specific capacitances of 360.4, 1012.8, 1190.4 and 1015.6 F g⁻¹ with capacitance retentions of 32.9%, 81.3%, 84.2% and 79.3% at 10 A g⁻¹ after 10,000 cycles. Even at higher current density of 30 A g⁻¹, ZnCo₂S₄@CNTs (5 wt%) composite also delivers a specific capacitance of about 880 F g⁻¹ with a capacitance retention of 93% after 30,000 cycles, revealing outstanding cycling stability. The above results exhibit that ZnCo₂S₄@CNTs composites can be promising candidates as electrode materials for pseudocapacitors with excellent electrochemical property in future applications.

在这项工作中，CNTs包裹的ZnCo ₂ S ₄纳米颗粒复合材料是通过简单的水热过程构建的。此过程允许将ZnCo ₂ S ₄纳米颗粒包裹在互连的CNT基质中，该基质结合了出色的电子传导性和良好的机械稳定性。碳纳米管包裹抑制了ZnCo ₂ S ₄纳米颗粒的聚集，并确保了电解质与ZnCo ₂ S ₄颗粒之间的有效接触，从而促进了离子的快速迁移。具体而言，ZnCo ₂ S ₄在所有样品中，@ CNTs（5 wt％）复合材料在循环过程中显示出最高的比表面积，最低的极化度和最高的可逆性。ZnCo ₂ S ₄ @CNTs（0、2.5、5和10 wt％）电极可提供360.4、1012.8、1190.4和1015.6 F g ^-1的比电容，在10时的电容保持率分别为32.9％，81.3％，84.2％和79.3％10,000次循环后的g ^-1。即使在30 A g ^-1的较高电流密度下，ZnCo ₂ S ₄ @CNTs（5 wt％）复合材料也可提供约880 F g ^-1的比电容，在30,000次循环后仍保持93％的电容，显示出出色的循环性能稳定性。以上结果表明，ZnCo₂ S ₄ @CNTs复合材料可以作为未来电容器中具有优异电化学性能的伪电容器电极材料。