4-NP Electrochemistry Detection And Super Capacitor Performance Studies Of Transition Metal/2-dimensional Carbon Materials

The rapid development of science and technology has provided great impetus for the development of human society and the progress of civilization,but the following problems,such as environmental pollution and energy shortage,prevent the further development of human society.It is urgent to detect and remove water environmental pollutants and develop efficient energy storage equipments.The main content of this project is related to several composites based on transition metals and 2D carbon materials,and their applications as the detectors toward pollutants in water and supercapacitors for energy storage.The details are as follows:1.3D AgInS₂/rGO was successfully synthesized and prepared by a hydrothermal method.The hybridization of rGO and AgInS₂synergistically improved the conductivity of AgInS₂/rGO.The results of SEM,BET,XRD,XPS,Raman and electrochemical tests show that AgInS₂/rGO/GCE exhibits good sensing performance and selectivity for 4-NP.The AgInS₂/rGO/GCE sensor has a wide linear range（1.43-2696.14μM）and a low detection limit（78.2 n M）,which is lower than the EU detection standard.At the same time,as detecting tap water and river water,AgInS₂/rGO/GCE electrode also shows excellent detection performance.Owing to the easy-preparing,easy-operating,highly sensitive and efficiency for the detection,AgInS₂/rGO/GCE has a good application prospect for the detection of trace 4-NP in natural environment.2.H Rb-NiHCF/g-C₃N₄hybrid hollow structure was successfully prepared by Mn²⁺spillover method.H Rb-NiHCF/g-C₃N₄was modified on NF to form a combination electrode.The results show that the electrode has excellent electrochemical performance due to the structure of PBA hollow mesoporous nano box and the addition of g-C₃N₄.The specific capacitance is 787.5 F/g at the current density of 1A/g,and the cycle stability is 90.1%after 5,000 cycles at the current density of 10 A/g.Besides,the H Rb-NiHCF/g-C₃N₄//AC SASC device is also constructed,which achieves a high energy density of 46.9 Wh kg^-1and a high power density of 11.3 k W kg^-1.After 2,000 cycles of charge/discharge at 10 A/g,it shows a capacitance retention rate of 80%.The mechanism analysis shows that the supercapacitor has a energy storaging mechanism of intercalatio/de-intercalation of K⁺.The hybrid material of mesoporous H Rb-NiHCF/g-C₃N₄ is highly potential in the application of high performance supercapacitor.3.CoHCF and GO were successfully incorporated together to form CoHCF/GO-0.1by hydrothermal and calcination method.The CoHCF/GO-0.1/NF composite electrode and CoHCF/GO-0.1/NF//CoHCF/GO-0.1/NF flexible and wearable all solid state symmetrical super capacitor device were successfully prepared.The results show that the successful hybridization of GO makes a decrease of the internal resistance of the composite material CoHCF/GO-0.1,which accelerates the electron transfer rate on the active materials and improves the electrochemical performance.The high specific capacitance values of 410.9 F/g and 544.4 m F/cm²are achieved at the current densities of 1 A/g and 1 m A/cm².At the same time.The maximum energy density（E）of the flexible and wearable all solid state symmetrical super capacitor is 37.19 Wh kg^-1at 1351.0 W kg-1.It exhibits an excellent capacitance retention of 98.89%after10,000 charge/discharge cycles at 10 A/g,indicating the high life length of the super capacitor.The stable support for LED indicator working and wearable performance indicate that the all solid state symmetrical supercapacitor of CoHCF/GO-0.1/NF//CoHCF/GO-0.1/NF prepared by this experiment has a good application prospect.