CuCo-Based Carbonate Hydrosulfide Nanoarray Supported on Carbon Cloth as Electrocatalysts for Glucose Sensing

Abstract

Earth-abundant transition-metal-based nanomaterials are recognized as one of the most promising materials for electrochemical sensing. Developing facile methods to prepare transition-metal-based catalysts for nonenzyme glucose sensing is an attractive issue in the electrochemical fields. In this study, we employed carbon cloth (CC) as a self-supporting substrate and developed a nonenzymatic electrochemical glucose platform based on a self-supporting CuCo-based carbonate hydrosulfide nanoarray (CuCoS/CC) via a green sulfurization strategy. In contrast to those of the original catalyst, the electrical conductivity and electrocatalytic activity of CuCoS/CC were significantly enhanced after sulfurization. The developed electrode presented an ultrahigh sensitivity of 12113 μA mM^–1 cm^–2, a wide linear range of 0.25–1883.25 μM, and a low limit of detection (LOD) of 0.29 μM (S/N = 3). Meanwhile, the CuCoS/CC also exhibited satisfactory reproducibility, stability, and anti-interference together with feasibility in actual sample analysis, proving its excellent potential for real-world applications. Our work provides a facile strategy for designing CuCo-based sulfide nanoarrays and could serve as an inspiration for the development of transition-metal-based compounds for enzyme-free glucose sensing.