Evaluating the synergistic effect of co-sputtered W-TiN and W-CrN electrodes for superior capacitance in hybrid supercapacitors

Bimetallic transition metal nitrides have gained significant attention as battery-grade electrode materials for the application of energy storage. This study investigates the electrochemical performance of co-sputtered tungsten (W) with titanium nitride (TiN) and chromium nitride (CrN), where the electrode fabrication is carried out using an RF/DC magnetron sputtering unit. The structural properties, surface morphology, and elemental content of the sample are analyzed with X-ray diffraction, SEM, and EDX, respectively. The battery-grade nature of the electrode materials is revealed by the electrochemical performance in half-cell configuration. In half-cell assembly specific capacity (Q_s) of 1408 C/ g is achieved with W-TiN and 583.8 C/ g with W-CrN electrode, respectively. The device (W-TiN//AC) delivers a specific capacity of 347.2 C/g, with energy and power densities of 88 Wh/kg and 1700 W/kg. Linear and quadratic models are employed to deconvolute the capacitive and diffusive impact on the total capacity of the device.