中文

Hierarchical yolk-shell layered potassium niobate for tuned pH-dependent photocatalytic H-2 evolution

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  • Release time:2021-02-28

  • Impact Factor:5.721

  • DOI number:10.1039/c6cy02640k

  • Journal:CATALYSIS SCIENCE & TECHNOLOGY

  • Key Words:VISIBLE-LIGHT; CARBON-DIOXIDE; HYDROTHERMAL SYNTHESIS; HYDROGEN GENERATION; NANOTUBE ARRAYS; RHODAMINE-B; HNB3O8; REDUCTION; COCATALYST; WATER

  • Abstract:Photocatalysts and the reaction environments in which they act are crucial for improving the photocatalytic efficiency. But the pH-dependent evolution of H-2 photocatalysed using nanoscale potassium niobate particles with high surface areas has not received attention. In this study, a straightforward Ostwald ripening method was developed to synthesize KNb3O8 with a thin nanosheet assembled hierarchical yolk-shell structure and large surface area of 60.6 m(2) g(-1). The H-2 evolution from a water-methanol solution in an alkaline to neutral environment was studied. The photocatalytic H-2 evolution rates over fabricated hierarchical yolk-shell KNb3O8 increased when OH-concentrations were decreased. Such behaviour implied that the concentration of H+ dominated the H-2 evolution over hierarchical yolk-shell KNb3O8 rather than the reduction ability from the conduction band, differing from the corresponding bulk material. This study demonstrated an efficient method to achieve a high H-2 evolution rate in a neutral environment through the use of photocatalysts with hierarchical structures and large surface areas.

  • Indexed by:Journal paper

  • Volume:7

  • Page Number:1000-1005

  • Translation or Not:no

  • Date of Publication:2017-02-21

  • Included Journals:SCI


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