Defect Engineering In CuO Catalyst For Glucose Oxidation

With the increasing importance of glucose detection,the development of high performances catalyst for glucose detection has also begun to receive attention.CuO characterized by excellent performance for glucose detection,while the favorite and attention.Various strategies,such as adjusting morphology or composition,are used to improve the electrochemical performance of glucose oxidation.However,intrinsic defects(vacancies,grain boundaries)of CuO are usually forgotten.Therefore,the effects of intrinsic defects for CuO on glucose oxidation were studied,and then the structure-activity relationship between glucose oxidation property and defect structures was explored.In addition,the mechanism by which defects promote glucose oxidation was research.The main researches are as follows:(1)The CuO nanoflakes enriched with surface oxygen vacancies were successfully fabricated,and then using for studying the performance of glucose oxidation.The results of phase structure,morphology structure and electrochemical measurements indicates that CuO nanoflakes enriched with oxygen vacancies exhibites an excellent performance(ultrahigh sensitivity of 4870 μAmM-1 cm-2).The structure-activity relationship between oxygen vacancies defects and glucose oxidation performance was further studied,and the possible reaction mechanism was that the abundant surface oxygen vacancies can improve the adsorption and stabilization of OH-and favour the formation of Cu3+ species,thereby decreasing the energy barrier of the electrode and enhancing catalytic activity.(2)CuO nanobundle(CuO-NB)with grain boundaries were fabricated by simple coprecipitation method.The results of morphology structure,phase structure,physicochemical properties and electrochemical measurement suggest grain boundaries can not only promote glucose didiffusion but also reduce glucose oxidation barrier.Therefore,the CuO-NB exhibits lower onset potential(94 mV)and higher activity of glucose oxidation.Thanks to the outstanding performance,CuO-NB shows excellent property for non-invasive glucose sensors and direct glucose alkaline fuel cell,and including superhigh sensitivity of 7474 μA mM-1cm-2 and the maximum power density(248 W m-2).