Preparation Of Electrodes Based On Molybdenum Disulfide And Its Composite Nanomaterials And Their Application

In recent years,energy and food security have been regarded as global hot issues.For example,the demands of electronic equipment and cars powered by electricity make the needs for energy and supplying-power systems also climb sharply.The pollution caused by the consumption of chemical fuels by human beings impacts on the ecological environment,and then affects every aspect of human life.Therefore,the important part of the current research is to develop environmentally friendly,efficient and sustainable energy storage devices.Supercapacitor is a new kind of energy storage device,with fast charge and discharge,which has the advantages of high power density of traditional capacitor and high energy density of traditional battery.Due to the above reasons,more and more researchers pay attention to it.We should not overlook the problem of food security,when our living standards continues enhancing.If the food safety is not guaranteed,it will seriously threaten our human body and mental health,and then will affect our country's economic development and social stability.The abuse of veterinary medicine,feed and food additives is a major food safety problem.Therefore,it is urgent to strengthen the routine detection and evaluation of various additives in food.With the advantages of simple,sensitive,fast,portable of electrochemical sensors,so they have been widely used in many fields,such as life science,food science and environmental science.MoS2,a member of the transition metal bisulphide family,has an unique sandwich structure in which every two Mo atoms are connected with an S atom.MoS2 called graphene-like,has a similar structure to graphene.But graphene has a zero band gap,while MoS2 posses a band gap.So this feature makes it more widely used in photoelectric devices than graphene.In addition,the traits of MoS2,including the defect and the large specific surface area,provide a variety of possibilities for surface modification and chemical functionalization.Terbutaline sulfate(TBS)is a ?2-adrenoceptor agonist and overdoses of TBS can cause serious harm to human body and even threat to life.In this paper,we demonstrate a simple and facile method for the preparation of molybdenum disulfide-gold nanoparticle composite(MoS2/AuNPs).The character about morphology,structure and composition of the obtained MoS2 and MoS2/AuNPs were characterized and investigated by the following methods,such as scanning electron microscopy,transmission electron microscopy and X-ray powder diffraction.The MoS2/AuNPs modified glassy carbon electrode(MoS2/AuNPs/GCE)was constructed by dropping method,and the electrochemical behavior of TBS was studied at the modified electrode The results indicated that the sensor had excellent electrocatalytic activity for TBS,and the detection sensitivity for TBS increased more than 100 times compared with the bare GCE.With the successive addition of TBS,the peak current of the differential pulse stripping voltammogram(DPSV)of TBS is proportional to its concentration within a certain range,the linear range is 1?85 nmol L-1,the limit of detection(LOD)is up to 0.47 nmo1L-1.Furthermore,the modified electrode showed good stability,reproducibility and anti-interference ability,so it could be used to detect TBS in actual samples.In this paper,MoS2,polyaniline(PANI)and its composite nanomaterials were prepared by hydrothermal and polymerization reactions,and then MoS2/PANI/FCC(functionalized carbon cloth)electrodes were constructed.The electrochemical behavior of the electrode was investigated by cyclic voltammetry and constant current charge discharge.The results show that the specific capacitance of MoS2/PANI/FCC?MoS2/FCC and PANI/FCC are 452.3?56.5 and 319.6 F/g at the current density of 0.2 A/g,respectively.The above results indicate that the prepared MoS2/PANI/FCC-10 electrode has good electrochemical properties.The specific capacitance retention rate of the composite reached 87%after cycling 1000 times at the current density of 10 A/g.Therefore,the prepared of MoS2/PANI/FCC-10 electrode has good stability.The electrodes prepared based on MoS2 can not only be constructed electrochemical sensors for sample detection,but also used as energy storage materials to play an important role in the field of supercapacitor electrode materials.MoS2 can synthesize nanoparticles,which have different physical and chemical properties,with adjustable morphology by changing reaction parameters in the synthesis process,such as the reaction time,temperature and material ratio.Therefore,the development of MoS2 nanomaterials in the interdisciplinary field still has a large space for scientific research and application.