1. Facile synthesis of nanocrystalline high-entropy diboride powders by a simple sol-gel method and their performance in supercapacitor.
- Author
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Yang, Yao, Bi, Jianqiang, Gao, Xicheng, Sun, Kangning, Qiao, Linjing, Liang, Guandong, and Wang, Hongyi
- Subjects
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SUPERCAPACITOR performance , *SUPERCAPACITOR electrodes , *POWDERS , *X-ray diffraction , *LOW temperatures - Abstract
A sol-gel method was employed for the synthesis of new High-entropy boride (HEB) powders, (Hf 0.2 Nb 0.2 Cr 0.2 Ta 0.2 Mo 0.2)B 2 , with nanoscale. The as-synthesized powders were obtained at a relatively low temperature of 1650 °C, and had small average particle size of 62.09 nm. X-ray diffraction confirmed that the (Hf 0.2 Nb 0.2 Cr 0.2 Ta 0.2 Mo 0.2)B 2 powders were hexagonal single-phase without any oxide impurities. In particular, electrochemical performance of the (Hf 0.2 Nb 0.2 Cr 0.2 Ta 0.2 Mo 0.2)B 2 powders with multiphase and high-entropy single phase were investigated using a three-electrode system. The improved electrochemical performance of the HEB powders is realized, with 27% higher in specific capacitance compared to the powders with multiphase. The HEB powders electrode exhibits a high capacitance retention of 97.03% after 5000 cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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