谢广文   Professor

谢广文,教授,博士,长期从事纳米材料、微晶与非晶态材料研究与应用,在纳米材料表面改性、非晶态催化材料等领域取得了许多创新性成果。近年来在《燃料化学学报》、Chemical Engineering Journal、Carbon、Green Energy & Environment、Journal of Materials Chemistry A、Applied Surface Science、 ACS Applied Materials & Interfaces、Journal of Power Sources、Renewable Energy、Surface and Coatings Technolo...Detials

Size-dependent catalytic activity of cobalt phosphides for hydrogen evolution reaction

Release time:2021-03-15  Hits:

  • Key Words:OXYGEN REDUCTION REACTION; REDUCED GRAPHENE OXIDE; CONTROLLABLE SYNTHESIS; BIFUNCTIONAL ELECTROCATALYST; EFFICIENT ELECTROCATALYSTS; COP; PERFORMANCE; ARRAYS; NANOPARTICLES; CATHODE
  • Abstract:Transition metal phosphides are a class of promising electrocatalysts for hydrogen evolution reaction(HER) to replace noble metals.In this work,we for the first time synthesize carbon supported CoP nanoparticles with the average particle sizes from 3.3 to 9.2 nm,via a solvothermal process followed by low-temperature topological phosphorization,and the size-dependent HER activity of the CoP is investigated by virtue of TEM,XRD,XPS and the electrochemical techniques.It is discovered that the 9.2nm-CoP particles possess high intrinsic HER catalytic activity as compared to the 3.3nm-CoP,although the smaller one displays a high mass activity due to the large surface area.Detailed studies manifest that the small CoP particles suffer from serious oxidation once exposing to air.In contrast,most cobalt remains in the quasi-metallic state in the relatively large CoP particles,which is beneficial for the desorption of Hads,the rate determining step of the HER process over CoP surface.In addition,the low charge transfer resistance across the liquid/solid interfaces also contributes to the excellent HER activity of the relatively large CoP particles.
  • Volume:v.43
  • Issue:04
  • Translation or Not:no