Leafy copper-cobalt nanostructures/three-dimensional porous carbon for glucose sensing
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A novel non-enzymatic glucose sensor was developed by electrodepositing leafy copper-cobalt nanostructures (Cu–Co NSs) on the persimmon-derived three-dimensional macroporous carbon (PD3DMC). The electrochemical behaviors and the electrocatalytic performances towards the oxidation of glucose of the Cu–Co NSs/PD3DMC were evaluated by cyclic voltammograms, chronoamperometry, and amperometric method. Compared with the sensors based on monometal Cu or Co, the Cu–Co NSs/PD3DMC sensor based on bimetal exhibited good electrocatalytic activity towards the oxidation of glucose. The effects of the electrodeposition potential and the molar ratio of Cu2+ and Co2+ in the electrodeposition solution on the electrocatalytic performance of the resulted Cu–Co NSs/PD3DMC were explored in detail. The optimum catalytic activity of the sensor towards the oxidation of glucose can achieve under the optimized conditions the electrodepositing potential of − 1.2 V and the Cu2+/Co2+ molar ratio of 1:20. The catalytic current density was linear to the glucose concentration in the range of 0.002–2.73 mM (R = 0.9977) with a sensitivity of 2.21 mA cm−2 mM−1 and a detection limit of 0.7 μM.
KeywordsCu–Co bimetallic nanostructures Persimmon-derived macroporous carbon Glucose Electrochemical sensor
This work was financially supported by the National Natural Science Foundation of China (21765009 and 21465015), Natural Science Foundation of Jiangxi Province (20143ACB21016), and Scientific Research Foundation of Jiangxi Education Commission (GJJ160288).
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