Enhanced Electrochemical Performance of W 18 O 49 /TiN Binary Composite Electrodes for Asymmetric Supercapacitors

Abstract

To develop high-performance supercapacitors, this study produced and thoroughly characterized a TiN-W 18 O 49 nanocomposite electrode. The successful production of the TiN-W 18 O 49 nanocomposite, which combines the high electrical conductivity of TiN with the pseudocapacitive behavior of W 18 O 49 , was validated by structural and morphological investigations (XRD, SEM, and EDX). The results of the electrochemical tests showed that the composite outperformed the parts used purely. Low solution resistance (Rs = 0.54 Ω) and a significantly reduced charge transfer resistance (Rct = 1.38 Ω) were observed by electrochemical impedance spectroscopy, suggesting effective electron transport and enhanced interfacial kinetics.Redox peaks were clearly visible in the potential window of 0.0-0.5 V at scan speeds of 50 mV . s - 1 in cyclic voltammetry, and a high specific capacitance of 1482 F . g -1 at 1 A . g -1 was obtained in galvanostatic charge-discharge analysis. Asymmetric supercapacitor in the potential range of 1.3 V show 91.1 % of its initial capacitance retained after 10,000 cycles, the electrode demonstrated exceptional cycling stability. Furthermore, the TiN-W 18 O 49 //AC electrode achieved a maximum power density of 4564.9 W . kg -1 and an impressive energy density of 58.91 Wh . kg -1 . Based on these findings, the TiN-W 18 O 49 heterostructure is a potential electrode material for nextgeneration supercapacitors, due to the synergistic effect of the two materials.