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NiMn2O4 spinel binary nanostructure decorated on three-dimensional reduced graphene oxide hydrogel for bifunctional materials in non?enzymatic glucose sensor

Abstract
Nickel-manganese spinel oxide (NiMn2O4) was hybridized with reduced graphene oxide hydrogel (rGOH) via a facile solvothermal process and a highly porous three-dimensional (3D) structure was constructed. The NiMn2O4/rGOH exhibited excellent electrochemical performance due to the high specific surface area, excellent electrocatalytic activity, and enhanced electrical conductivity due to the synergetic effects between the two components. The NiMn2O4/rGOH exhibited excellent glucose sensing performance with high sensitivity (1310.8 ?A?mM?1?cm?2), a wide linear range (2 μM ? 20 mM), rapid response time (? 3.5 s), and anti-interference properties. Furthermore, it also showed excellent supercapacitor performance with a high capacitance (396.85 F?g?1) and excellent energy and power density on account of the large surface area and pseudo-capacitor behavior of NiMn2O4. A self-powered glucose sensor can be fabricated with NiMn2O4/rGOH as both supercapacitor and glucose sensing electrodes.

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