Study On Preparation Of Metal-organic Frame Materials And Assemble Of Friction Nanogenerators

The speedy development of society and technology,is caused more the large amount of energy consumption which leads to the energy crisis and requires people to seek new energy.Friction nanogenerator(TENG)is a new type of energy storage and collection device.Its output performance is mainly affected by the composition and structure of electrode materials.It is an effective way to realize TENG application to explore the structure-activity relationship between material structure and TENG performance.The modifiability,variability and controllability of metal-organic frameworks(MOFs)were established to predict the relationship between structure and properties at the molecular level.Therefore,the effects of SBUs and ligand size and length on TENG output performance of MOFs were investigated based on the molecular structure design of MOFs.The results show that MOF-TENG device has excellent output and durability,realizing self-driven photocatalytic[2+2]reaction.1.The materials were prepared by using different multi-core SBUs(1-3 is dual-core,tricore and five-core SBUs,respectively)in DMF and H2O mixed solvents:{[Cd2(CBBD)(DMF)3]·0.5H2O}n(1),{[Cd3(CBBD)]·2H2O}n(2),{[Cd5(CBBD)2(?4O)]·7.5H2O}n(3),respectively.In order to further explore the influence of the construction of MOFs SBUs on TENG performance,MOF-TENG devices were assembled with polyvinylidene fluoride(PVDF)and 1-3 as friction electrode layer materials.The results showed that the order of TENG output performance was 1-TENG>2-TENG>3-TENG,indicating that dual-nucleus 1 is more likely to lose electrons.Then,density functional theory(DFT)calculation proves that the order of gain and loss of electrons for different Cd-SBUs is:dual-core Cd-SBUs>Three nuclear Cd-SBUs>five-core Cd-SBUs,Furthermore,the output performance of TENG can be precisely regulated by multi-core SBUs.2.Based on the effect of multi-core SBUs on the output performance of TENG,we explored the effect of isomorphic MOFs center metal ions on TENG output performance.We use a cation-induced single crystal to single crystal(SC-SC)conversion strategy,Anionic skeleton {(H3O)0.5[Zn1.5(CPCDC)(COO)0.5]·1.5H2O}n(4)and the topological equivalent double metal {(H3O)0.5[ZnCo0.5(CPCDC)(COO)0.5]·2H2O}n(5).Firstly,pure MOFs powder and counter electrode PVDF were used to assemble TENG devices,and the effect of different metal centers on TENG output performance was investigated.The results show that the output performance of Zn/Co-MOF-TENG can be effectively improved by introducing Co? and adjusting the electronic structure,and the current and effectively improve the output performance of Zn/Co-MOF-TENG.The corresponding current and voltage are 69 ?A and 623 V,respectively.In addition,considering the applicability of MOF-Teng devices,MOF@PVDF-TENG devices were constructed by the PVDF electrodes with different contents(10%-60%)/same thickness/roughness of MOF@PVDF.Of all the assembled TENGs devices,The Output performance of Zn/Co-MOF@PVDF-TENG is the highest,with current and voltage of 83 ?A and 679 V,respectively.The device works continuously for 50000 cycles at 5 Hz,and the output current has no obvious fluctuation.Moreover,the test of the device after 40 days showed that its output performance did not significantly degrade,indicating that the device has excellent stability.Therefore,the output performance of MOF@PVDF-TENG device is not only effectively improved,but also more conducive to the long-term use of the device.Considering its application in self-energy supply,we explored its application in organic photocatalytic reaction by driving ultraviolet lamp plate.The photocatalytic results show that Zn/Co-MOF@PVDF-TENG device can realize the self-drive energy supply of uv lamp plate,and effectively promote the cycloaddition reaction of organic macrocyclic compound[2+2].3.The length and size of functionalized ligands and the degree of conjugation are important factors affecting MOFs in the field of photocatalysis.In order to explore the effects of ligands on THE performance of MOF-TENG,we controlled the length and shape of terminal bipyridine ligands and constructed structure-adjustable graded Cd-MOFs(68):Cd(BBPD)(4,4'-bpa)0.5(H2O)]n(6)?[Cd(BBPD)(4,4'-bpe)(H2O)]n(7)and[Cd(BBPD)(4,4'-bpp)(H2O)]n(8).Crystal tests show that crystal 6 and crystal 7 are isomorphic hierarchical structures:crystal 6 contains unconjugated(-C-C-)4,4'-bpa ligands,while crystal 7 contains conjugated(-C=C-)4,4'-bpe ligands.8 contains 4,4'-bpp ligands with non-conjugated but large size.TENG devices were then assembled by using the energy level structure 6-8 of bipyridine ligands of different sizes and shapes as the friction electrode layer material and the opposite electrode PVDF.The results show that 4,4'-bpe with ?conjugated group provides the electronic structure of 7,and 7-TENG has the highest output performance,the current and voltage are 60 ?A and 502 V.DFT theoretical calculation shows that the unconjugated 4,4'-bpa and 4,4'-bpp ligands have similar energy levels in MOFs,while the conjugated 4,4'-bpe ligands have the lowest energy level and are more conducive to electron escape.Using a similar synthesis method,7@PVDF composite films with the same thickness/roughness/content from 3%-15%were prepared.The test results show that the output performance of 7@PVDF-TENG containing 12%Cd-MOFs(7)is the same as that of pure powder 7-TENG device,and the device has better stability.7@PVDF-TENG device can be used to drive the UV lamp plate for self-driving[2+2]ring addition reaction of macrocyclic compound.