Ultrahigh Electrochemical Performance Co₄Sb_11.2Sn_0.02Te_0.78 for Supercapacitor Cathode

Abstract:

Due to the high theoretical specific capacitance, the skutterudite CoSb₃ alloy is a promising supercapacitor electrode material. However, the lack of oxidative active sites and intrinsic poor electrical conductivity greatly hinder its application prospects. Here, we constructed a CoSb₃ alloy compound co-doped with Sn and Te (Co₄Sb_11.2Sn_0.02Te_0.78) by a melting and annealing method. As the electrode material of the supercapacitor, Co₄Sb_11.2Sn_0.02Te_0.78 cathode shows an ultrahigh specific capacity of 1357 mAh g^-1 (at 1 A g^-1). Even when the current density is increased to 20 A g^-1, 42% of the initial capacity is maintained. The advantageous performance of the supercapacitor cathode based on Co₄Sb_11.2Sn_0.02Te_0.78 is attributed to the more redox active sites and the improved electrical conductivity. Furthermore, this work provides a promising strategy for developing high-performance next-generation supercapacitor electrode materials.

• Periodical: Materials Science Forum (Volume 1108)
• Pages: 103-108
• DOI: https://doi.org/10.4028/p-5e3mI1
• Online since: December 2023
• Authors: Zhi Peng Li, Xin Rui He, Xing Chen, Yi Niu, Jing Jiang*
• Keywords: Cathode, Co₄Sb_11.2Sn_0.02Te_0.78, Supercapacitor, Ultrahigh Specific Capacity

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