Noble Metal Loaded & Its Supporting And Their Electrochemical Properties

Increasing energy demands and global warming have been the new challenges for mankind.A series of extreme climate problems brought by global warming have been increasingly and warn human being to make changes.Developing clean energy is the most critical step to overcome these problems.Hydrogen energy is the cleanest green energy source.The development and utilization of hydrogen energy is great significance of dealing with global warming and energy crisis.Hydrogen production of electrolyzed water is pollution-free and environmentally friendly.However,the kinetics of the water decomposition process are too slow so that will cause excessive energy consumption.Therefore,the development of excellent hydrogen evolution reaction?HER?and oxygen evolution reaction?OER?catalysts to accelerate the dynamics of water decomposition is the key measures.In recent years,the catalytic performance of non-precious metal catalysts in water decomposition has made considerable progress,but there is still a large gap compared with precious metal catalysts.From the perspective of reducing costs and improving catalytic performance,reducing the size of precious metal catalysts is an important strategy to improve the performance of precious metal catalysts.In this paper,the methods of doping,galvanic replacement and so on were used to prepare precious metal-loaded composite materials and conduct electrochemistry Performance testing.The research content is as follows:?1?Well-dispersed sub-nanometre-sized?SNS?iridium?Ir?species decorated mesoporous Co₃O₄ was fabricated for oxygen evolution reaction?OER?via pyrolysis of IrCl₃/Co?NO₃?₂ complexes confined within mesoporous of the KIT-6 template.It was found that the KIT-6 template played a critical role in the formation of SNS Ir species.The electrochemical results demonstrated that moderate Ir incorporation was conductive to forming the high valence Co ions in form of Co oxyhydroxide during the OER process.The present work would open a new material design for SNS Ir species decorated mesoporous metal oxides for the application in catalysis.?2?Ru?OH?_xCl_y cluster-modified CoNi alloy nanoparticles encapsulated in nitrogen-doped graphene?RuCo Ni@NC-X?was prepared by a partial galvanic replacement reaction.The electrochemical results indicated that moderated Ru?OH?_xCl_y cluster was beneficial to improve the both OER and HER properties of CoNi alloy nanoparticles?CoNi@NC?.The outstanding performance was presumably attributed to the amalgamation of properties and the synergistic effects stemming from the individual constituents.This simple and facile strategy for synthesizing Ru?OH?_xCl_y cluster on metal nanoparticles could significantly enhance the activity of OER and HER.?3?Unraveling the effect of metal doping on the intrinsic activity of metal nitride remains a grand challenge.Herein,Ru?Rh,Co,Ni?doped vanadium nitride are successfully synthesized via a simple soft-urea pathway.In comparison,the Ru doped VN electrocatalyst exhibited much better HER performance than Rh,Co and Ni doped VN electrocatalysts.Such excellent performance can be attributed to the unique synergetic effect between Ru and VN.This simple and facile strategy could possibly be extended to fabricate a series of metal doped vanadium nitride,which can be served as a promising platform for future energy applications.?4?Typical metal-support interaction?MSI?includes charge transfer,the interfacial perimeter,nanoparticle morphology,chemical composition.Modulating the MSI can significantly affect catalytic activity of catalysts.In this paper,we first report the synthesis of Ru species uniformly decorated on Bi₂O₃ nanorod,which serves as an efficient“pre-electrocatalyst”for hydrogen evolution reaction?HER?.The XRD and XPS results unveil that a fast in situ conformational transition from Bi₂O₃ to Bi has preferentially occurred during the HER process,resulting in the reconstitution of metal-support interface,which can effectively enhance the electrocatalytic performance for hydrogen evolution in both acidic and alkaline electrolytes.