چكيده به لاتين
In this research, layered bimetallic, trimetallic and tetrametallic hydroxides based on cobalt and yttrium were synthesized and investigated with the aim of improving supercapacitor performance. Electrochemical results showed that increasing the number of metals in the structure of layered hydroxides improves their specific capacity, electrical conductivity and cyclic stability. Comparing the samples, the specific capacity of bimetallic layered hydroxide was 842 F/g, trimetallic 2140 F/g, and four metallics was 6153 F/g, at a current density of 1 ampere/g, which indicates a remarkable improvement in performance with the increase in the number of metals. The four-metal layered hydroxide showed the highest performance, which is due to the synergy between the metals and the increase in the number of active centers in its structure. In the next step, in order to further improve the electrochemical properties, four-metal layered hydroxide was combined with a supramolecular linker named (3-chloropropyl)trimethoxy-silane and ZIF-67. Examining the supercapacitor performance of this composite compared to its constituents showed that the synergy between ZIF-67 and layered hydroxide has led to an increase in specific capacity, a faster response rate, and improved cyclic stability. In addition, all the materials were examined in a two-electrode system, and in these conditions, the bi-metallic layer material lit an LED lamp for 45 seconds, the tri-metallic material for 110 seconds, and the four-metallic material lit an LED blue lamp with a voltage of 3 volts for 210 seconds. The results of this research show the high potential of these materials in the development of high-performance supercapacitors for sustainable and advanced energy storage.
