The Synthesis And Electrochemical Performance Of Several Copper-based Nanomaterials

With the emergence of energy shortages and environmental destruction,electrochemical energy storage technologies such as batteries,fuel cells and electrochemical capacitors began to develop gradually.What affects these energy conversion devices most is the material.Among metal matrix composites,copper matrix composites have been widely studied for their excellent physical and chemical properties.Based on its excellent charging storage mechanism,copper as a transition metal has been widely used in the electrochemical field.In this paper,the preparation methods of copper-based nanomaterials and their applications in electrochemical field are briefly introduced,including three parts of the experimental content:1.The controllable synthesis of porous copper oxide nanoparticles and their applications in glucose sensors:porous CuO particles with oxygen vacancies were synthesized by simple calcination of CUC2O4 particles and the existence of oxygen vacancies was confirmed by a series of characterization.When the porous cuo particle with oxygen vacancy is modified to a non-enzymatic glucose sensor,it has high sensitivity and good anti-interference abilities.Oxygen vacancies can help to increase the rate of electron reaching to the surface and accelerate the kinetics of the surface redox reaction to improve the electrochemical properties of the materials.In this work,the enzymatic glucose sensor has a high anti-interference capability of up to 10490.45 ?,A MM-1 cm-2,which is higher than that of many noble metals and copper based electrocatalysts studied before.This work verifies that porous copper oxide nanoparticles can be used as a promising enzyme-free glucose sensor material.2.The controllable synthesis of Cu-MOF@d-MnO2 composites and study of its supercapacitor performance:in this work,with two simple steps of water bath and stirring to compound ?-MnO2 ultrathin nanosheets,Cu-MOF nanoparticles were evenly grown on the ?-MnO2 ultrathin nanosheets.Based on the large specific surface area of the ultrathin nanosheets and the synergistic effect of the nanopores in the Cu-MOF,the composite has a larger specific capacitance.When it used together with activated carbon as an asymmetric supercapacitor electrode,its potential can reach 2 V,and at a current density of 1.0 A g-1,the specific capacitance is as high as 340 F g-1.This asymmetrical supercapacitor has only 5%of capacitive loss after 6000 cycles.The wide charge-discharge potential range,high specific capacitance and long cycle life make it an ideal candidate for supercapacitor electrodes.3.The controllable synthesis and electrocatalytic properties of Zn/N doped copper oxide materials:in this work,we synthesized Zn-ZIF precursors by a simple agitation method,and then synthesized CuO materials doped with Zn/N by a series of soaking and calcination.Three different materials were synthesized by changing the calcination temperature and the oxygen precipitation was tested.The samples showed different electrocatalytic properties in 1 M KOH solution.The best material has a current density of 100 1A cm-2 at a voltage of 1.79 V and the lowest current-response voltage is 1.52 V.The tafel slope of the three samples were respectively 166,188 and 325.85 mV dec-1.Compared with the previous work in the application of copper-based materials in electrocatalysis,there are still some improvements in this work,but the multi-element doping method can be used as an important reference in the synthesis of electrocatalytic materials.In our work,several simple synthesis methods of copper matrix nanocomposites are introduced.During the experiment,the morphology of the samples is changed by adjusting the experimental conditions,and the properties of the samples are optimized in the experiments.When modified to glucose sense,supercapacitors and electrocatalytic,they show excellent performances.In this series of experiments,we compared and summarized the structure and synthesis conditions of the materials,which laid a certain foundation for the development and application of copper based nanocomposites.