Synthesis Of Metal-Organic Framework Materials And Their Research On Electrocatalysis And Fluorescence Sensing Properties

Energy and environmental issues have always been two major issues restricting human development.The intemperate use of energy and the increasingly serious environmental pollution make mankind face a major choice for survival and development.If we want to have both,we need to find a new energy that can be used continuously without causing a lot of pollution to the environment.Hydrogen energy is regarded as the most promising clean energy because of its zero pollution and high combustion heat.However,the production of hydrogen has always restricted the development of hydrogen energy.Among the many hydrogen production methods,water splitting to produce hydrogen has always been a hot topic,among which electrocatalytic water splitting is even more popular.Electrocatalytic water splitting includes hydrogen evolution reaction and oxygen evolution reaction.However,in the actual reaction process,similar to other chemical reactions,an overpotential is required to resist the unfavorable kinetic factors that hinder the progress of the reaction.Therefore,a highly efficient and double functional catalyst has become research hotspots.Based on a large amount of literature reading,this study synthesized a metal organic framework material that can adjust the morphology of the sample by changing the solvent ratio,and added different metal sources on this basis in an attempt to synthesize a bimetallic bifunctional electrocatalyst.The main work of this research is as follows:(1)A metal-organic framework material was synthesized by a simple method of standing at room temperature,and the morphology was changed by adjusting the ratio of the solvent according to the microstructure of the material,and then a simple low-temperature phosphating treatment was used to synthesize a metal organic framework material.The catalyst of ultra-small CoP particles,and then study its electrocatalytic performance.The results show that only 143 mV of overpotential is required to reach a current density of 10 mA·cm-2 during the hydrogen evolution reaction,while 298 mV of overpotential is required to reach 10 mA·cm-2 during the oxygen evolution reaction.In addition,we also used the sample at the same time as the cathode and anode to explore the overall water splitting performance.The results show that the voltage of 1.69 V can reach 10 mA·cm-2 during the process of total water splitting.The current density,at the same time,whether it is the HER process,the OER process or the process of total water decomposition,the synthesized materials show excellent stability.(2)On the basis of the above research,the two elements of cobalt and nickel are used as metal sources in the synthesis of metal organic framework materials to further explore the electrocatalytic performance of the bimetallic electrocatalyst.The results show that when the amount of nickel doped is cobalt At one-fifth of that,the material exhibits excellent electrocatalytic performance.Compared with single metal catalysts,the overpotential of both HER and OER is reduced by about 20 mV.(3)A series of Eu3+/Tb3+metal organic frameworks were synthesized by solvothermal method.Fluorescence sensing experiments show that these 1-EuxTb1-x are good dual-function sensors,and they have high selectivity and sensitivity for detecting 4-NP and Fe3+ ions.In addition,these complexes have good recyclability through simple washing.Figure[43]Table[12]Reference[153]...