Exploration of a Bimetallic NiSe<sub>2</sub>@CoSe<sub>2</sub> Nanosphere as a Proficient Electrode for Electrochemical Activity
M. Sangeetha Vidhya, R. Yuvakkumar, G. Ravi, Abdullah G. Al‐Sehemi, Van‐Huy Nguyen, Dhayalan Velauthapillai
Abstract
According to a resourceful survey, bimetallic selenides with their hierarchical nanostructures have gained widespread attention despite their enhanced electrical conductivity. Consequently, the incorporated morphology, structure, and constituent modulation of the foremost electrode endows it with a privileged trial for the transportation and diffusion of ions. The structural and morphological study agrees with the configuration of mono- and bimetallic selenides analytically. Herein, cobalt (Co) ions in their composite heterostructures find a fundamental role in the configuration of the nanostructure having fine conducting nature. Therefore, a nanosphere is merged arbitrarily to form a conductive network, which might ease charge transfer. Furthermore, the heterostructured NiSe2@CoSe2 electrode displayed an improved specific capacitance of 531 F g–1 at a current density of 1 A g–1, and an outstanding long-term durability of 99.88% was achieved over 5000 charge–discharge cycles. The nanostructure morphology and structure of the fabricated electrode predominantly stimulate its application in energy-related attributes because of large active sites, improved surface-to-volume ratio, and limited transport length of the ions. In addition, an assembled full cell NiSe2@CoSe2//AC with a paramount operating voltage of 1.5 V using 1 M KOH achieved an increased energy density of 41 Wh kg–1 at a power density of 738 W kg–1 with a retention of 99.86% over 5000 cycles. The highly assembled asymmetric device lights up a blue light-emitting diode (LED), demonstrating a voltage of 1.63 V. The existing protocol entails an excellent reference for various metal selenides for efficient storage appliances.