Alzaid Meshal, Iqbal Muhammad Zahir, Alqahtani Bandar, Alanazi Rakan, Alsohaimi Ibrahim Hotan, Mohamed W S, Hadia N M A
Department of Physics, College of Science, Jouf University P.O. Box 2014 Al-Jouf Sakaka Saudi Arabia
Nanotechnology Research Laboratory, Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Topi 23640 Khyber Pakhtunkhwa Pakistan
RSC Adv. 2023 May 23;13(23):15575-15585. doi: 10.1039/d3ra00847a. eCollection 2023 May 22.
The layered structures of tungsten disulfide (WS) and molybdenum tungsten disulfide (MoWS) are considered as the most promising electrode materials for energy storage devices. Herein, MS (magnetron sputtering) is required for the deposition of WS and MoWS on the surface of the current collector to attain an optimized layer thickness. The structural morphology and topological behavior of the sputtered material were examined X-ray diffraction and atomic force microscopy. Three-electrode assembly was used to start the electrochemical investigations to identify the most optimal and effective sample among WS and MoWS. CV (cyclic voltammetry), GCD (galvanostatic charging discharging), and EIS (electro-impedance spectroscopy) techniques were employed to analyze the samples. After preparing WS with optimized thickness as the superior performing sample, a hybrid device was designed as WS//AC (activated carbon). With a remarkable cyclic stability of 97% after 3000 continuous cycles, the hybrid supercapacitor generated a maximum energy density () value of 42.5 W h kg and 4250 W kg of power density (). Besides, the capacitive and diffusive contribution during the charge-discharge process and -values were calculated by Dunn's model, which lay in the 0.5-1.0 range and the fabricated WS hybrid device was found to have a hybrid nature. The outstanding outcomes of WS//AC make it suitable for future energy storage applications.
二硫化钨（WS）和钼钨二硫化物（MoWS）的层状结构被认为是储能设备中最有前景的电极材料。在此，需要采用磁控溅射（MS）在集流体表面沉积WS和MoWS，以获得优化的层厚度。通过X射线衍射和原子力显微镜对溅射材料的结构形态和拓扑行为进行了研究。采用三电极组件开始电化学研究，以确定WS和MoWS中最优、最有效的样品。采用循环伏安法（CV）、恒电流充放电法（GCD）和电化学阻抗谱法（EIS）对样品进行分析。在制备出具有优化厚度的WS作为性能优异的样品后，设计了一种混合器件WS//AC（活性炭）。该混合超级电容器在连续3000次循环后具有97%的显著循环稳定性，产生的最大能量密度（）值为42.5 W h kg，功率密度（）为4250 W kg。此外，通过邓恩模型计算了充放电过程中的电容和扩散贡献以及值，其值在0.5 - 1.0范围内，且制备的WS混合器件具有混合性质。WS//AC的出色结果使其适用于未来的储能应用。
