Low temperature fabrication of hydrangea-like NiCo2S4 as electrode materials for high performance supercapacitors

Hydrangea-like NiCo 2 S 4 as electrode materials for high performance supercapacitors was synthesized by using a facile low temperature (90 °C) two-step hydrothermal technique without surfactant or template. The special hydrangea-like structure and large specific surface area (74.8 m 2 /g) provided plenty of electro active sites which were beneficial to superior pseudocapacitive performance of NiCo 2 S 4 . The supercapacitors performance of NiCo 2 S 4 was investigated by a three-electrode system. NiCo 2 S 4 exhibited high specific capacitance with 1475 F g −1 at a current density of 3 A g −1 , and a fairly high rate capacity with 1152 F g −1 at 20 A g −1 . These results indicate that low temperature hydrothermal is a very promising method to prepare electrode materials for supercapacitors.