Efficient synthesis of Ni3S2 nanoflowers supported on S, N-codoped carbon flakes via molten NaCl template for High-Performance non-enzymatic glucose detection catalysts

Abstract

Ni3S2 nanoflowers supported on S, N-codoped carbon flakes (Ni3S2/SNCF) are successfully synthesized via a facile pyrolysis method with the assistant of a molten NaCl template. This unique approach not only facilitates the formation of the desired nanoflower and flake structure but also promotes the synthesis of pure Ni3S2, crucial for its non-enzymatic glucose detection performance. L-cysteine served as the source of nitrogen, sulfur, and carbon. The distinctive structure significantly enhanced the catalytic activity for glucose oxidation by exposing active sites, modifying electronic environment, and improving conductivity. Ni3S2/SNCF exhibited remarkable glucose sensing: high sensitivity (1704 μA mM−1 cm−2), low detection limit (1.1 μM, S/N = 3), wide linear range (3.7 μM-1.7 mM), and excellent resistance to interference, reproducibility, and long-time stability. Furthermore, Ni3S2/SNCF showed promising potential for non-enzymatic glucose detection in artificial sweat. This study presents a general methodology for the rational design and controlled fabrication of electrocatalysts with similar structures.