Synthesis of NiGa2O4 nanosheets for non-enzymatic glucose electrochemical sensor

Construction of non-enzymatic sensors for glucose is highly attractive and important. In this work, NiGa2O4 nanosheets were employed as an enzyme-free catalyst for glucose electrooxidation. NiGa2O4 nanosheets grown directly onto porous nickel foam (NF) through hydrothermal method. And its morphology and structure was characterized by various techniques. As an electrochemical catalyst, it need not extra bonding or modification with electrode and it has strong adhesion with substrate after annealing process. As a binder-free electrode material, NiGa2O4@NF exhibits excellent performance for glucose sensing in alkaline media. It has a rapid response time less than 5 s for glucose. And it can distinguish glucose in a wide concentration range of 0.03–2.5 mM, with a detection limit of 5.0 □M. In addition, it displays a high selectivity for glucose. Our study broadens the application area of NiGa2O4 spinel materials and it may have potential in electrochemical analysis of small biomolecules.