Hierarchical N-doped porous carbon scaffold Cu/Co-oxide with enhanced electrochemical sensing properties for the detection of glucose in beverages and ascorbic acid in vitamin C tablets

Abstract

This research focuses on the development of a highly efficient electrocatalyst, Cu_xO/NPC@Co₃O₄/NPC-10-7, for detecting glucose and ascorbic acid. In a 0.1 M NaOH solution, the modified electrode exhibits a sensitivity of 3314.29 μA mM^-1 cm^-2 for glucose detection. The linear range for ascorbic acid sensing is 0.5 μM - 23.332 mM, with a detection limit as low as 0.24 μM. In a 0.1 M PBS solution, the linear range for ascorbic acid detection extends to 43.328 mM, which represents the best performance reported to date by chronoamperometry. Moreover, the electrode demonstrates high accuracy, with a recovery rate of 96.80 % - 103.60 % for glucose detection and a recovery rate of 95.25 % - 104.83 % for ascorbic acid detection. These results suggest that the Cu_xO/NPC@Co₃O₄/NPC-10-7 modified electrode shows significant potential for practical applications in food detection.

Keywords: Ascorbic acid; Bimetallic; Carbon skeleton; Glucose; Sensing; Synergistic effect.