ZIF-derived Co3O4/CoSe2/CoO framework with dual-interface heterostructures as an efficient catalyst for electrochemical uric acid detection.

Abstract

A well-designed ZIF-derived Co3O4/CoSe2/CoO framework with dual-interface heterostructures (DIH) is synthesized and evaluated for electrochemical uric acid (UA) detection using differential pulse voltammetry. The dual-interface configuration provides additional pathways for charge redistribution, adsorption, and interfacial reaction kinetics, which is unattainable by conventional single-interface heterostructures. In this way, the DIH sample exhibits high sensitivity (217 µA mM-1 cm-2), a wide linear detection range (4-1200 µM), and a low detection limit (1.27 µM). Theoretical calculations further reveal that the DIH sample possesses a higher adsorption energy and stronger Bader charge, suggesting that it has a stronger charge transfer and reactivity, which significantly improves the electrochemical performance compared with traditional single-interface heterostructure materials. These results indicate that dual-interface heterostructure sensors show promising potential for the electrochemical detection of metabolic biomarkers in biological samples.

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