The Low Content Noble Metal/transition Metal Phosphorous Oxide Composites In The Research Of Hydrogen Evolution Reaction

The over-exploitation and usage of traditional fossil energy has increasingly caused serious environmental problems.Hydrogen has been considered promising as a clean energy cattier to replace fossil fuels for its high energy density and the water of combustion products.Water splitting for hydrogen evolution reaction?HER?is an efficiently and eco-friendly method to produce highly purified hydrogen.Development of strongly uphill with large overpotential and high cost catalysts are still the main technical bottleneck for its commercial application.To date,platinum?Pt?-based nanomaterials are still the most efficient and commonly used noble metal catalysts for HER.Scarcity and high cost of Pt largely impedes its commercial application.Therefore,reducing the amount of Pt or developing a Pt-free catalyst is an effective way to overcome cost-effective challenges.In this paper,the transition metal phosphorus oxide is used as the base material,and noble metal wires are used as the counter electrode to synthesize low precious noble metal composites by electrodeposition.The main contents are as followed:?1?Cobalt phosphorus oxide-carbon nanotube composites are used as the based material and iridium wire is used as the counter electrode.The iridium oxide-cobalt phosphorus oxide-carbon nanotubes composites?Ir O₂-Co Pi-CNTs?are synthesized by electrochemical deposition.The structure of the material is characterized by scanning electron microscope and transmission electron microscope.The iridium oxide particles are uniformly dispersed on the surface of CNTs.The excellent hydrogen evolution catalytic performance of composites shows 29 m V at a current density of 10 m A cm^-2.The hydrogen evolution mechanism of composite is further explored through density functional theory calculations,and the theory is consistent with the experimental results.?2?Using nickel phosphorus oxide-carbon nanotube composite material as the based material and rhodium wire as the counter electrode,rhodium oxide-nickel phosphorus oxide-carbon nanotube composite materials?Rh₂O₃-Ni Pi-CNTs?are synthesized by electrochemical deposition.The structure of the material is characterized by scanning electron microscope and transmission electron microscope.The rhodium oxide particles are uniformly dispersed on the nanoparticles.The as-prepared Rh₂O₃-Ni Pi-CNTs catalyst shows excellent catalytic activity and stability toward HER in both acidic and basic solutions.