Liquid Phase Preparation And Electrocatalytic Properties Of Cu-based Nano Materials

The precious metal Pt is widely used in many electrocatalytic fields due to its excellent electrocatalytic ability,and its high cost and poor stability limit its practical progress.After the transition metal Cu is incorporated into Pt to form a Cu Pt alloy,it can not only reduce the loading rate of Pt,but also make it have a unique bimetal effect,thereby improving the stability of the catalyst.Therefore,this paper uses the hydrothermal method to design and successfully prepare Cu_0.44Pt_0.56 nano-alloy particles,flake Cu@Cu Pt nano-alloys,granular Cu3Pt nano-alloys and relatively high-purity Cu Br nano-materials,and electrolyze them to separate hydrogen and methanol.Oxidation and glucose sensing properties were studied.First,using copper chloride(Cu Cl₂)as the Cu source precursor,CTAC as the surfactant,ascorbic acid(AA)as the reducing agent,and chloroplatinic acid(H₂Pt Cl₆)as the Pt source precursor,Cu_0.44Pt_0.56 was successfully prepared by the water bath method nanometer alloy particles.Cu_0.44Pt_0.56 alloy shows good electrocatalytic stability under various environments and its catalytic performance is superior to that of elemental Pt:in acid solution(p H=1),Cu_0.44Pt_0.56 alloy is at a current of 10 m A/cm²The density is 24 m V lower than that of pure Pt nanoparticles;in neutral solution(p H=7.4),the stability of Cu_0.44Pt_0.56 alloy is about 100 times that of pure Pt nanoparticles;in alkaline solution(p H=14),after 6 hours of hydrogen evolution reaction,the stability of Cu_0.44Pt_0.56 alloy is enhanced due to the remodeling of the structure,the initial potential shifts forward by 62 m V,and the catalytic performance is significantly improved.Secondly,in order to study the influence of alloy dimensions and structure on catalytic performance,a sheet-shaped Cu@Cu Pt nano-alloy was successfully prepared.The obtained sheet-shaped Cu@Cu Pt nano-alloy was used for hydrogen evolution electrocatalysis,and the catalytic performance of Cu_0.44Pt_0.56 nano-alloy particles was compared.In an alkaline solution,the overpotential for hydrogen evolution of the flaky Cu@Cu Pt nano-alloy is 172 m V,which is better than that of the Cu_0.44Pt_0.56 nano-alloy particles,and as the catalytic time increases,part of the Cu is lost and the catalytic activity is significantly enhanced.The overpotential is reduced by 34.30%.During the catalytic oxidation of methanol,the flaky Cu@Cu Pt nano-alloy also showed excellent performance.The ratio of forward scan peak current(J_f)and reverse scan peak current(J_b)of 1 M methanol solution in an acidic environment(0.05 M H₂SO₄)can reach4.277,indicating excellent catalyst resistance to intermediate poisoning.In addition,KCl was used as an additive to successfully prepare particulate Cu₃Pt nano-alloys.Due to the high content of Cu,the performance of Cu₃Pt in the catalytic hydrogen evolution performance test is slightly lower than that of Cu_0.44Pt_0.56,and the overpotential in alkaline solution is higher than that of Cu_0.44Pt_0.56,which is 498 m V.But in the reaction of catalyzing the degradation of Na BH₄ vat dyes,Cu₃Pt alloy shows excellent catalytic performance.Among them,the catalytic rate of catalyzing p-nitrophenol is 1.05*10^-2/s,which is much higher than similar catalysts.Finally,KBr was used as an additive to successfully prepare Cu Br nanoparticles with a higher purity and a diameter of 45-55 nm.The obtained Cu Br nanoparticles were modified on the working electrode to construct an enzyme-free glucose sensor.The results show that the detection range for glucose can be 1-80 m M,which is much higher than the detection range of enzyme-free glucose sensor constructed by similar materials,and its sensitivity can reach 208?A·m M^-1·cm^-2.In addition,the sensor constructed by Cu Br nano-compounds has good anti-interference characteristics when detecting solutions such as fructose,uric acid and ascorbic acid,and is expected to be applied in practical applications.In this paper,a simple liquid phase method is used to prepare three Cu-based alloys and one Cu-based compound.The selected drugs in the synthesis are pollution-free and cause less pollution to the environment.Compared with precious metal materials,Cu-based nanomaterials not only exhibit excellent electrocatalytic performance,but also greatly reduce the production cost of catalysts,providing a reference for the development of new Cu-based nanomaterials.