Nano Energy, Volume 57, March 2019, Pages 307-316
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Nanostructured ternary metal chalcogenide-based binder-free electrodes for high energy density asymmetric supercapacitors
Vimal Kumar Mariappana,1, Karthikeyan Krishnamoorthyb,1, Parthiban Pazhamalaia, Surjit Sahooa, Swapnil Shital Nardekara, Sang-Jae Kima,c,⁎
aDepartment of Mechatronics Engineering, Jeju National University, Jeju 63243, Republic of Korea bNanomaterials laboratory, Department of Mechatronics Engineering, Jeju National University, Jeju 63243, Republic of Korea cDepartment of Advanced Convergence Science and Technology, Jeju National University, Jeju 63243, Republic of Korea
An essential way to enhance the energy density of a supercapacitor(SC) is to use high capacitance electrode materials via developing binder-free electrode with porous and hierarchical nanostructures. Herein, we demonstrated the use of copper antimony sulﬁde (Cu3SbS4) nanowires directly grown on Ni foam (using a microwave-irradiation process) as a binder-free positive electrode for SCs. The growth mechanism, eﬀect of microwave irradiation time on the morphology and electrochemical properties of Cu3SbS4 on Ni foam were discussed in detail. The cyclic voltammetric studies (using three-electrode test) of Cu3SbS4/Ni-5 electrode showed the presence of Type-C battery-like charge-storage properties. The Cu3SbS4/Ni-5 electrode delivered a high speciﬁc capacity (835.24 mAh g−1) as obtained from the charge-discharge analysis (at a current density of 2.5mAcm−2). Further, the device speciﬁc properties of the Cu3SbS4/Ni-5 positive electrode was examined via fabricating asymmetric supercapacitors (ASCs) using two diﬀerent negative electrodes viz. (i) planar-graphene, and(ii)binder-freecoppermolybdenumsulﬁdeanchoredonNifoam(Cu2MoS4/Ni)electrodes,respectively.The electrochemical analyses of the fabricated ASCs revealed that the Cu3SbS4/Ni-5║Cu2MoS4/Ni ASC possess almost 3.0-fold higher energy density compared to the Cu3SbS4/Ni-5║graphene ASC. The Cu3SbS4/Ni5║Cu2MoS4/Ni ASC delivered a high speciﬁc device capacitance of 213.6Fg−1 with a remarkable energy density (58.15Whkg−1), maximum power density (6363.63Wkg−1), and better cycle-life. The use of two diﬀerent binder-free electrodes in the Cu3SbS4/Ni-5║Cu2MoS4/Ni ASC results in their superior performance metrics over the reported ASCs, thus, highlighting their potential applications towards next-generation supercapacitors.