Self-assembly And Properties Research On Novel Poly (Cluster) Compounds

Great progress has been made in the development of human society and science and technology.New technologies and inventions have brought great convenience to modern society.However,almost all these advanced technologies rely on unsustainable fossil fuels,such as coal and oil consumption,which leads to huge carbon dioxide emissions and serious environmental problems.To address climate change and the depletion of fuel supplies,the development of clean energy is crucial and urgent.Many advanced technologies such as supercapacitors,electrolytic water hydrogen production and fuel cells have attracted wide attention.For this reason,a suitable bimetallic metering ratio MOFs,is designed to adjust the intrinsic structure of the material to promote the rapid transmission of electrons.A Cluster-based Metal-Organic Layers(CMOL)anode material with excellent properties,high chemical stability and good electrical conductivity was prepared:Ni_0.7Co_0.3-CMOL.the high specific capacitance of 1181 F g^-1 was shown in the three-electrode system.After 5000 cycles in 1 M KOH,the capacitance retention rate reached 92.4%,which was better than most reported original MOF based materials.The assembled all-solid-state flexible asymmetric supercapacitor device has a specific capacitance of 117 F g^-1 at a current density of 1 A g^-1and an energy density of 16.25Wh kg^-1 when the power density is 500 W kg^-1;shows potential practical applications at ultrahigh current density.This developed synthesis strategy will inspire further construction of MOF-based crystalline or composite electrode materials for various energy-related applications.The delay of kinetics in the multi-electron transfer of oxygen evolution reaction puts forward higher requirements for the catalyst,a highly efficient oxygen evolution reaction catalyst was synthesized after exploration.The overpotential is only 321 m V at a current density of 20 m A cm^-2,has exceeded the performance of the commercial Ir O₂ catalyst(341m V)and the Tefel slope is much smaller than Ir O₂.It is proved that the material has excellent catalytic reaction power.And has a small charge transfer resistance(R_ct),indicating that the charge transfer process of the material is relatively fast.Moreover,the larger electrochemically active surface area(ECSA:30.3 m²g^-1)provides more active sites.Ni_0.4Co_0.6-CMOL has full superiority in participating in catalytic oxygen evolution reaction.The high efficiency oxygen evolution catalyst was synthesized(Co Fe-MOF-74-2)by template-directed method,which proved that the electrocatalytic oxygen evolution reaction performance can be affected by regulating the ordered arrangement of metal elements in bimetallic MOFs.Through a series of characterization methods and electrochemical tests,it has been proved that the introduction of Zn²⁺as electrocatalytic inhibitors to regulate the ordered arrangement metal elements can reduce its catalytic performance.Before the synthesis of high efficiency catalyst Co Fe-MOF-74-2,specific ideas are provided.The Co Fe-MOF-74-2 synthesized by template-directed method has better catalytic performance than Co Fe-MOF-1 synthesized by one-pot method.this approach provides specific paths for optimizing the catalytic performance of bimetallic or even polymetallic MOFs.