A Dual Functionality of Ternary Metal‐Oxide Nanoflakes for High‐Performance of Micro Supercapacitor and Electrochemical Sensing of Dyes in Water

Abstract

The energy density limit of the metal oxide system increases by altering the bi‐metallic system to ternary metal oxide systems. Here we report, the synthesized ternary metal oxide system for distinct dual applications (Micro supercapacitor and Dye‐sensing activity). The nanoflake‐shaped materials [MNC‐A (Ni 1.0 Co 0.9 and Mg 0.4) O 0.6 and MNC‐B (Ni 1.0 Co 0.5 Mg 0.5) O1.0] were synthesized by the hydrothermal method followed by an annealing process. The synthesized tri‐metal‐oxide were analyzed using various physicochemical and electrochemical analyses to examine their material and electrochemical properties respectively. The obtained nanoflake‐like structure can render rich active reaction sites and rapid ion diffusion pathways. When examined as an asymmetric supercapacitor electrode material, it delivers outstanding specific capacitance of 198 Ag−1 at 0.3 Fg−1. Furthermore, the asymmetric supercapacitor provides a high‐energy density of 70.7 W h kg−1 at 0.36 kW kg−1 and a high‐power density of 4.5 kW kg−1 at 11.0 W h kg−1 respectively. Particularly, it maintains the high cyclic stability and retained 99.8 % initial specific capacitance after 50,000 charge/discharge cycles at the current density of 2 A g−1. Interestingly, the three interconnected systems deliver enough power to brighten a 3 V LED for up to 2 minutes. Also, the active material used as an electrode for the detection of low‐level dissolved dyes in water (ppm).