Reduced graphene oxide anchored MnCo2S4 for solid state asymmetric capacitor device
Yuttana Mona, Uma Shankar Veerasamy, Vigneshwaran Baskaran, Nakorn Tippayawong, Phrut Sakulchangsatjatai, Niti Kammuang-lue, Pana Suttakul, Ramnarong Wanison
Abstract
• The rGO@MnCo 2 S 4 was synthesized via a simple solvothermal method. • The rGO@MnCo 2 S 4 sample showed the nanoflower was placed over the rGO nano sheets. • The rGO@MnCo 2 S 4 //rGO device shows the capacity value of 140.83 mAh g -1 • The P values of rGO@MnCo 2 S 4 //rGO device shows 37.55 Wh kg -1 and 800 W kg -1 . A wide working potential range of asymmetric capacitor devices with solid state gel electrolytes have enormous advantages of energy storage devices like high capacity, long life and high-power density. Here, the sandwiched type rGO@MnCo 2 S 4 //rGO asymmetric supercapacitor (ASC) electrode was constructed and functioned with a wide potential of 1.6 V. The electrochemical evaluation was verified through a three-electrode operating system, it shows the MnCo 2 S 4 and rGO@MnCo 2 S 4 electrodes have 42.72 mAh g -1 and 82.57 mAh g -1 capacity values. Moreover, the constructed rGO@MnCo 2 S 4 //rGO ASC device shows a higher capacity of 140.83 mAh g -1 at 1 A g -1 . In addition, the rGO@MnCo 2 S 4 //rGO ASC device also delivers a higher energy density of 37.55 Wh kg -1 and power density of 800 W kg -1 . However, the stability of the rGO@MnCo 2 S 4 //rGO ASC device shows about 93 % cyclic retention after 3000 cycles. These results may show the rGO@MnCo 2 S 4 electrode is an opted electrode material for supercapacitor applications.