Two-dimensional nanostructured metal chalcogenides have significant consideration as electrode materials for energy storage application owing to their fascinating properties. In this work, we have grown two-dimensional MoSe₂ sheets directly on the surface of nickel foam via facile one-step electrochemical deposition method and examined their use as a binder-free electrode for supercapacitor. The physicochemical characterizations such as X-ray diffraction, field emission scanning electron microscope, X-ray photoelectron spectrum, and Raman analysis confirmed the formation of MoSe₂ sheets on Ni foam. The effect of deposition time (5 and 10 min) on the electrochemical properties of the MoSe₂ sheets are examined in detail using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopic analyses, respectively. The cyclic voltammetry profiles confirmed that the charge-storage mechanism in MoSe₂ sheets is due to the ion intercalation/de-intercalation kinetics. A high specific capacity of 548 mAh g⁻¹ was obtained for the MoSe₂/Ni electrode from CV profile measured using a scan rate of 5 mV s⁻¹. The MoSe₂/Ni electrode delivered a specific capacity of 325.92 mAh g⁻¹ from charge-discharge analysis obtained at constant discharge current density of 4 mA cm⁻² with good cyclic stability. The capacitive properties and the mechanism of charge-storage in the MoSe₂/Ni electrode deposited at different time intervals were examined by the electrochemical impedance spectroscopy using Nyquist and Bode phase angle plot. The experimental results ensure that the MoSe₂/Ni electrode might be used as the high-performance electrode for the next-generation energy storage devices.

二维纳米结构的金属硫属化物由于其引人入胜的性能而成为储能应用中的电极材料。在这项工作中，我们通过简便的一步式电化学沉积方法在泡沫镍的表面上直接生长了二维MoSe ₂薄板，并研究了它们作为超级电容器的无粘合剂电极的用途。X射线衍射，场发射扫描电子显微镜，X射线光电子能谱和拉曼分析等理化特征证实了在泡沫镍上形成了MoSe ₂薄板。沉积时间（5和10分钟）对MoSe ₂电化学性能的影响分别使用循环伏安法，恒电流充放电和电化学阻抗谱分析对纸页进行详细检查。循环伏安曲线表明，MoSe ₂片材中的电荷存储机理是由于离子嵌入/脱嵌动力学。根据使用5mV s ^-1的扫描速率测量的CV曲线，对于MoSe ₂ / Ni电极获得了548 mAh g ^-1的高比容量。根据在4 mA cm ^-2的恒定放电电流密度下获得的充放电分析，MoSe ₂ / Ni电极的比容量为325.92 mAh g ^-1具有良好的循环稳定性。使用Nyquist和Bode相角图通过电化学阻抗谱研究了在不同时间间隔沉积的MoSe ₂ / Ni电极中的电容性质和电荷存储机理。实验结果确保了MoSe ₂ / Ni电极可用作下一代储能设备的高性能电极。