Exploring the factors affecting the electrochemical catalytic signal of organic metal material sensor and analyzing the decisive steps of the glucose oxidation behavior is a challenging problem. Here, we designed a copper-cobalt-based organic backbone with excellent sensing properties based on the nanostructure of "ultramicroelectrodes", and explored the role of different hydroxyl adsorption capacities in the sensing process of glucose oxidation. Dimethylimidazole was used as a starting substrate, and then, copper and cobalt ions were introduced by hydrothermal treatment to prepare a copper-cobalt-based organic backbone (Co/Cu-MOF) with good electrochemical glucose sensing. Due to the abundant micro-reaction sites of Co/Cu-MOF and the ability to control the hydroxyl group adsorption by adjusting the Co/Cu ratio, the excellent electrocatalytic sensing performance is greatly ensured. Co/Cu-MOF (Co/Cu molar ratio 20:1) showed the best adsorption capacity for hydroxyl groups with a sensibility of 0.45 mA mM-1 cm-2 and a LOD of 0.82 μM for electrochemical glucose sensing. In summary, the sensing performance was effectively improved by adding adsorbed hydroxyl groups to provide an oxygen source for the glucose oxidation decision step without changing the specific components.

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