Hierarchical yolk-shell layered potassium niobate for tuned pH-dependent photocatalytic H2 evolution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bo Liang
  • Ning Zhang
  • Chen Chen
  • Xiaohe Liu
  • Renzhi Ma
  • Shengfu Tong
  • Zongwei Mei
  • Haiyan Wang
  • Yougen Tang

Detail(s)

Original languageEnglish
Pages (from-to)1000-1005
Journal / PublicationCatalysis Science and Technology
Volume7
Issue number4
Publication statusPublished - 2017

Abstract

Photocatalysts and the reaction environments in which they act are crucial for improving the photocatalytic efficiency. But the pH-dependent evolution of H2 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 m2 g-1. The H2 evolution from a water-methanol solution in an alkaline to neutral environment was studied. The photocatalytic H2 evolution rates over fabricated hierarchical yolk-shell KNb3O8 increased when OH- concentrations were decreased. Such behaviour implied that the concentration of H+ dominated the H2 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 H2 evolution rate in a neutral environment through the use of photocatalysts with hierarchical structures and large surface areas.

Citation Format(s)

Hierarchical yolk-shell layered potassium niobate for tuned pH-dependent photocatalytic H2 evolution. / Liang, Bo; Zhang, Ning; Chen, Chen; Liu, Xiaohe; Ma, Renzhi; Tong, Shengfu; Mei, Zongwei; Roy, Vellaisamy A. L.; Wang, Haiyan; Tang, Yougen.

In: Catalysis Science and Technology, Vol. 7, No. 4, 2017, p. 1000-1005.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review