MnNbS/Polyaniline Composite‐Based Electrode Material for High‐Performance Energy Storage Hybrid Supercapacitor Device

Hybrid supercapacitor or supercapattery devices have gained significant attention for their impressive power ( P d ) and energy densities ( E d ), as well as their exceptional cyclic stability compared to traditional storage devices. In this study, manganese niobium sulfide (MnNbS) is synthesized using a hydrothermal method. To enhance the electrochemical performance of MnNbS, polyaniline (PANI) is blended at varying mass ratios. Initially, the electrochemical properties of MnNbS/PANI are evaluated using a three‐electrode configuration, consisting of working, counter, and reference electrodes. At a current density of 2 A g −1 , MnNbS/PANI exhibits an improved specific capacity () of 1366 C g −1 . Subsequently, to develop a supercapattery energy storage device, a two‐electrode system is constructed. This setup offers enhanced performance and flexibility, making it an ideal choice for high‐performance supercapacitors. Activated carbon (AC) and MnNbS/PANI are employed as the negative and positive electrodes, respectively, in the two‐electrode system. Notably, the device demonstrates outstanding energy density ( E d ) of 26.2 Wh kg −1 , power density ( P d ) of 2072 W kg −1 , and specific capacity of 118 C g −1 . Furthermore, durability tests involving 1000 charge–discharge cycles reveal a capacity retention of 79%. This study suggests that MnNbS/PANI (at a weight ratio of 80/20%) holds promise as an electrode material for supercapattery applications.

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