Effect of Ni doping on manganese cobaltite: A bifunctional electrocatalyst for supercapacitor and electrochemical determination of mesotrione

Herein, we developed an efficient bifunctional electrocatalyst of Ni-doped MnCo₂O₄ (Ni-MnCo₂O₄) microsheet for electrochemical detection and supercapacitor applications. The various ratios of Ni-doped MnCo₂O₄ microsheets were synthesized by the morphology-controlled hydrothermal method. The different percentages of Ni doping at 2.5 %, 5.0 %, 7.5 %, 10.0 %, and 12.5 % were used to prepare MnCo₂O₄ microsheets, respectively. The prepared electrocatalyst were confirmed the structural and physicochemical characterization by using different spectroscopic analyses. Furthermore, the 10 % Ni-MnCo₂O₄/GS electrocatalyst achieved a good specific capacitance of 105.8 Fg⁻¹ at a current density of 2 Ag⁻¹ in two-electrode system. The asymmetric supercapacitor was constructed using a 10 % Ni-MnCo₂O₄/GS electrode, which delivered an energy density of 42.8 Wh kg⁻¹, along with a power density of 1616 W kg⁻¹, and it exhibits admirable capacitive retention of 97.7 % for 1000 cycles. After that, the 10 % Ni-MnCo₂O₄/GCE showed a more effective electrochemical reduction CV peak of hazardous pesticide mesotrione (MT) than other electrodes. The constructed electrode of 10 % Ni-MnCo₂O₄/GCE exhibited a lower LOD, higher sensitivity, good repeatability, and restoring ability. Furthermore, the practical capability of MT at 10 % Ni-MnCo₂O₄/GCE was tested in river water and corn samples to display well-recoverable results.