Study On Transition Metal Porphyrin Eletrocatalysts For Catalyzing Hydrogen Evolution From Acetic Acid And Water

With the increasing consumption of fossil fuels,the reserves are decreasing day by day.These resources and energy will be exhausted one day in the future,which is an urgent need to find a new enriched energy source that does not depend on fossil fuels.Hydrogen energy is exactly such a new secondary energy that people are looking forward to being as the emergence of the conventional energy crisis and the development of new secondary energy sources.Because of its lightest weight,the best thermal conductivity,the ideal value of calorific value,good combustion performance and non-toxic and pollution-free,hydrogen energy has broad prospects for future development.So far the methods of obtaining hydrogen gas include water electrolysis,water photolysis,hydrogen production from non-renewable natural gas and renewable methanol and biomass,etc.Hydrogen production from water electrolysis is the most ideal and widely used method.The work of this paper is to study the synthesis of catalysts for electrocatalytic hydrogen production and the performance of hydrogen production.The main contents are as follows:1、The ligand TFPP and its related metal complexes（CuTFPP,CoTFPP and ZnTFPP）,were synthesized at room temperature and characterized by UV-Vis spectroscopy,HRMS and NMR techniques.2、Cyclic voltammetry and electrolysis experiments were carried out on three metal complexes respectively.When acetic acid was used as the proton source in the organic phase,the TOF values of the complexes 1（CuTFPP）,2（CoTFPP）and 3（ZnTFPP）were respectively22.1 and 19.8 And 18.1 h^-1.The TOFs of complexes 1,2 and 3 with water as proton source in the aqueous phase solution were 266,234 and 218 h^-1,while the Faradaic efficiencies were89.7%,90.4%and 91%,respectively.It was found that compounds were very stable in the electrolysis process after electrolysis 72 h test,without any decomposition or deterioration.In addition,in combination with the above cyclic voltammetry experiments and previous literature reports,we speculate on the mechanism of hydrogen production by the complexes.