Study On Relationship Between Catalytic Performance And Surface/ Interface Properties Of Transition Metal Oxides Semicondutor

Catalysis plays a vital role in providing solutions for many worldwide issues,such as energy development and utilization,environment protection,etc.Catalyst,where the catalysis reactions take place,determines the catalytic performance with its compositional and morphological properties.The catalyst surface decides the number of active spots,the surface charge density,reaction static energy,etc.Meanwhile the catalyst interface has a great influence on the separation and transport of（photo-induced）charges,dominant reaction type,etc.Hence,deep study on the function-structure relationship between catalyst surface/interface structure and reaction catalytic property is of great importance to the development of new noble catalytic materials.In a word,we decide to research on the surface/interface characteristics of catalysing composites.In detail,different catalysts are synthesized with purpose and are further evaluated with conducting electrochemical or photo-electrochemical reactions.Concerned studies are performed on,including but not limited to,size,crystal facet,surface states of materials and interface,synergistic effects of composites.1)CuFeO₂-CNT composites are synthesized for Oxygen Reduction Reaction.The introduction of carbon nanotubes（CNT）helps not only minimize the size of CuFeO₂ particles to nano scale,but also improve the conductivity of the composites.The synergistic effects of CuFeO₂ and CNT bring the catalyst with enlarged surface area,more active spots and better charge and mass transport.The enhancements of all aspects result in an improved ORR performance for the composites.2)TiO₂ nanorods array photoanode are optimized by controlling temperature for annealing.It is uncovered that annealing temperature has a great effect on the crystal phases,facets and morphology.Meanwhile technologies like XPS,SPV are employed here to study on how crystal or surface properties of catalysts affect the photo-electricchemical water splitting performance.Moreover,BiVO₄/TiO₂ nanorods composite is designed to further research on the relationship between semiconductors interface and the action of photo-induced charge.