Preparation And Application Of Black Gold And Noble Metal Or Cu₂O Composites

With the continuous exploitation of fossil fuels by human beings,the issue of energy shortage is imminent,and people have begun to find products that can replace fossil fuels.The fuel cell is a clean and efficient power generation device that directly converts the chemical energy of the fuel into electrical energy.Among the different types of fuel cells,direct methanol fuel cells are the best choice for light-duty vehicles and portable devices.So far,platinum or palladium can enhance the oxidation process of methanol,and at the same time,gold with the surface plasmon resonance effect can enhance its photoelectric catalytic performance.However,the high price,the resource scarcity and CO poisoning are key problems of the precious metals.Therefore,developing an inexpensive catalyst is one of the contents of this dissertation.With the continuous improvement of human living standards,diabetes is starting to become a nuisance.Accurate and convenient detection of glucose has attracted more and more attention.The development of low-cost and high-efficiency glucose biosensors is of great significance in many fields such as food industry,clinical diagnosis of diabetes,and biological research.Due to the good selectivity of enzymes,glucose sensors based on glucose oxidase or dehydrogenase have been applied to construct various enzyme-containing biosensors.However,enzymes are expensive and their catalytic activity is highly sensitive to environmental conditions such as temperature,p H,humidity and operating conditions.Therefore,the development of an inexpensive non-enzymatic glucose sensor is also one of the contents of this dissertation.（1）Application of B-Au-Pd electrode and B-Au-Pt electrode in alkaline methanol oxidation reaction.In this dissertation,B-Au-Pd and B-Au-Pt electrodes with different number of layers and tunable electrocatalytic activity were prepared by electrodeposition and underpotential deposition,respectively,which can be used for methanol electrolysis under alkaline conditions.Among the B-Au-Pd electrodes with different layers,the 0.08-layer B-Au-Pd electrode exhibits the highest methanol electrooxidation performance with the oxidation peak current density of 17.20m A·cm^-2（vs.SCE）in 0.5 M KOH+1M CH₃OH solution.The B-Au-Pt electrode with0.15 on-layer exhibits the highest methanol photoelectric catalytic performance with the oxidation peak current density of 16.67 m A·cm^-2（vs.SCE）in 0.5 M KOH+1M CH₃OH solution.This study provides a low-cost and simple method to synthesize controllable layer bimetallic electrodes for the electrocatalytic oxidation of methanol.（2）B-Au-Cu₂O electrode for glucose sensing.In this dissertation,B-Au-Cu₂O electrode was prepared by electrodeposition.As a p-type semiconductor,it has a good photoelectric conversion effect for the photocathode reaction of sodium sulfite.It has good catalytic activity for glucose in the alkaline media.A linear response was obtained in the concentration range of 2μM～11.3 m M,the sensitivity was 1454.65μA·m M^-1·cm^-2,and the detection limit was 1.66μM（S/N=3）.The B-Au-Cu₂O electrode can also eliminate the glucose detection process.Interference from interfering substances such as ascorbic acid（AA）.This study provides a low-cost and facile method to synthesize noble metal-transition metal-bonded composites for photoelectric conversion and enzyme-free glucose sensors.