The effect of the nitric acid heat treatment time on the electrochemical properties of NiCo2S4/carbon cloth composites as supercapacitor electrode materials [硝酸热处理对NiCo2S4/炭布复合电极材料电化学性能的影响]

作者：Xu X.-T.; Tian X.-D.; Li X.; Yang T.; He Y.-T.; Song Y.^*; Liu Z.-J.

来源：New Carbon Materials, 2020, 35(3): 244-252.

• Acid treatment
• Carbon fiber cloth
• Electrochemical performance
• NiCo2S4

Carbon fiber cloth (CC) was treated with nitric acid for different times, then loaded with NiCo2S4 nanoparticles by a one-step solvothermal method to prepare NiCo2S4/CC composites for use as supercapacitor electrode materials. Results show that the fiber surface became rough and the oxygen content increased with increasing acid treatment time. When the acid treatment time was 12 h, the distribution of NiCo2S4 nanoparticles on the carbon fiber was the most uniform among the samples investigated. The NiCo2S4/CC-12 h electrode achieved the highest specific capacitance of 1 298 F g-1 at 1 A g-1, and the capacitance remained at 89.7% of that at 1 A g-1 when the current density was increased to 20 A g-1. The capacitance retention rate was 95.3% after 3 000 cycles at 5 A g-1. When the NiCo2S4/CC and carbon nanofibers wwere used as the positive and the negative electrodes, respectively, the supercapacitor delivered a high energy density of 37.5 W h kg-1 at a power density of 754 W kg-1.

• 单位
  中国科学院大学