Robust Nanocomposite of Nitrogen-Doped Reduced Graphene Oxide and MnO2 Nanorods for High-Performance Supercapacitors and Nonenzymatic Peroxide Sensors

The urgent demand of sustainable energy systems and reliable sensing devices has fostered the development of cost-effective, multifunctional electrode material based platforms. In this work, we have demonstrated the bifunctionality of nitrogen-doped reduced graphene oxide-MnO2 nanocomposite (NRGO-MnO2), toward two most diverse and challenging applications: (i) supercapacitor and (ii) peroxide sensor, which was synthesized by a facile one-pot hydrothermal method. The electrochemical investigations revealed its high specific capacitance (648 F g–1 at 1.5 A g–1) with remarkable rate performance (retains 80.20% up to 10 A g–1) and long-term cyclic efficiency. Additionally, it can detect peroxide rapidly (2 s), with high sensitivity (2081 μAmM–1 cm–2) and a noteworthy detection limit (24 nM) in a wide dynamic range (0.4–121.2 μM). Fascinating features such as the distinguished selectivity, repeatability, and operational stability suggests its potency to be an ideal electrode for peroxide sensors. Finally, the ...