Preparation Of Carbon Loaded Transition Metal Catalysts And Its Electrolytic Performance In Wate Spliting

Energy is the strongest pillar of societal growth,and the lack of it is currently the most serious worldwide issue.It is vital to create new sustainable energy sources since traditional fossil fuels cannot support the needs of the developing world under the current economic system.Humanity prefers hydrogen energy over the others due to its high calorific value,environmentally friendly nature,and long-term viability.Among them,hydrogen energy is favored by mankind for its high calorific value,green and sustainable.Among the existing means to obtain hydrogen energy,electrolysis of water can directly obtain hydrogen with oxygen as a by-product,and the hydrogen energy obtained through this route is the most efficient in terms of capacity.Due to the slow kinetic process of the anode,reducing the oxygen precipitation overpotential is a major challenge to improve the efficiency of water electrolysis.The use of highly efficient OER catalysts is a common means to solve this challenge.Although the precious metals Ru and Ir show high performance,their expensive cost and scarce earth reserves limit the development.Hence,the creation of some novel,highly effective electrocatalysts at reasonable prices is essential for the advancement of electrocatalytic hydrolysis.Using heterogeneous and homogeneous catalysts as entry sites,two types of experiments were created to investigate the potential laws that may be utilized to direct the design of OER catalysts.（1）It is vital to use environmentally friendly techniques to make stable and highly catalytically active electrocatalysts for oxygen precipitation reaction（OER）.The copper-cobalt 1,3,5-benzenetricarboxylic acid（Cu-Co-BTC）MOF,a new bimetallic metal-organic backbone（MOF）,was effectively created here using the gas-solid two-phase flow synthesis（GSF）method.In order to improve the poor electrical conductivity of MOFs material,we loaded the prepared MOFs material onto a highly conductive carbon paper.The developed Cu-Co-BTC with several active sites required a low overpotential of just 239 m V to reach a current density of 10 m A cm^-2 in 1 M KOH solution as opposed to Cu-BTC and Co-BTC that contained a single metal.It also demonstrated improved electrocatalytic performance and stability.The significance of this work lies in the pioneering of a novel gas-solid two-phase flow synthesis technique for the large-scale,green preparation of high-quality MOFs materials for water electrolysis.（2）Because of their clearly defined structures,durable active cores,and highly adaptable ligands,molecular catalysts are of tremendous interest.In this article,we present a number of newly created nickel-based complexes.These complexes are built around a metal-centered nickel ligand that forms four strongly negatively charged N and P ligands.Several electron-donating groups with varying electron-donating capacities represent the distinctions.By altering the various electron-donating groups,we tried to modify the charge density of the metal center in order to affect how well the oxygen precipitation reaction worked.Indirectly,the molecular catalyst’s poor conductivity is made up for by loading onto carbon nanotubes,which also promotes the catalyst’s improved dispersion.Just 348 m V is the final overpotential at 10 m A,and performance degrades less after stabilization.The relationship between the catalytic activity of OER catalysts and the charge density of active centers was explored in this experiment,and the combination of molecular catalysts with carbon materials was able to solve the problems of their low electrical conductivity and stacking of active centers.This work provides an effective solution for the preparation of highly active catalysts.