Preparation Of Ruthenium Nanocomposite And Study On Their Electrocatalytic Performance

The production of hydrogen through water splitting is not only a key technology for efficient energy conversion,but also an important measure to solve the increasingly serious energy and environmental problems caused by over-reliance on traditional fossil fuels in recent years.However,the current Pt-based catalysts commonly used in water electrolysis have severely impeded the large-scale commercialization due to their acute scarcity and high cost.Therefore,there is an urgent need to find alternative catalysts that have the advantages of high activity and low price.Recent studies have shown that Ru-based materials are not only highly active,but also more economical compared to Pt.In addition,by introducing heteroatoms into the catalyst to coordinate with the metal atoms,not only can the catalytic activity of the catalyst be improved,but also the metal content in the catalyst can be reduced.And when the metal content is low enough,it can form a single metal atom,improve the utilization percentage of the metal atom in the catalyst,and further reduce the cost of the catalyst.Based on the above knowledge,this thesis uses a simple green wet chemical synthesis method to prepare a series of Ru-based nanocomposites.Through various characterization methods and electrochemical tests,the relationship between the structure of the material and the catalytic activity is analyzed.The main content includes the following parts:?1?A simple green wet chemical method is used to first prepare a uniform size and uniformly dispersed N-doped mesoporous carbon nanosphere substrate.Subsequently,Ru was introduced into the substrate and annealed to prepare Ru-NMCNs-T series samples,which are tested for hydrogen evolution reaction?HER?.The electrocatalytic performance was optimized by changing Ru's initial loading and annealing temperature.Among the prepared Ru-NMCNs-T series samples,Ru-NMCNs-500 showed the best electrocatalytic performance.In 1 M KOH,at the current density of 10 m A cm^-2,the overpotential was only 28 m V,and its activity and stability were superior to the commercial Pt/C catalyst.?2?Using ZIF-67 as a precursor,mesoporous carbon materials were obtained by pyrolysis under inert atmosphere.Subsequently,Ru atoms were introduced through Galvanic exchange reaction to form Co Ru bimetallic alloy catalyst,which was used to study the performance of oxygen evolution reaction?OER?.The electrocatalytic performance was optimized by changing the initial loading of Ru.In 1 M KOH medium,at the current density of 10 m A cm^-2,the overpotential of Co Ru/NC-10%is 0.33 V,comparable to Ru O₂?0.34 V?,and its stability is higher than Ru O₂.This thesis developed several facile and straightforward methods to fabricate durable high-efficiency and cost-effective Ru-based electrocatalysts,and these catalysts hold great potential for water splitting to produce hydrogen and beyond.