Linear NiCo2O4 modified by CuO nanoparticles with wide range and high sensitivity for glucose detection and excellent ultracapacitor performance

Abstract

To develop materials that can meet the sensing and capacitive performance of glucose. Hydrothermal and electroplating procedures were used to prepare linear NiCo₂O₄ and nano-CuO particles, respectively. The sensor's sensitivity was 1174.57 μA mM⁻¹ cm⁻¹, with a low detection limit of 0.024 μM (S/N = 3), and its detection range was 0.3–12.6 mM, with good stability as verified using an electrochemical workstation. In addition, at a current density of 2 A g⁻¹, this material exhibits a specific capacitance of up to 2140.0F g⁻¹ in supercapacitors. After 5000 cycles, its stability remained at 93.89 %. Similarly, asymmetric supercapacitor devices based on nickel foam exhibit A high specific capacitance of 605.5 F g⁻¹ at a current density of 2 A g⁻¹. It is demonstrated that linear NiCo₂O₄ modified with CuO nanoparticles can be employed not only as a sensitive material for glucose sensors but also for the production of supercapacitors.