Manipulating the Fate of Charge Carriers with Tungsten Concentration : Enhancing Photoelectrochemical Water Oxidation of Bi2WO6

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

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Author(s)

  • Hoi Ying Chung
  • Cui Ying Toe
  • Weijian Chen
  • Xiaoming Wen
  • Roong Jien Wong
  • Rose Amal
  • Fatwa Firdaus Abdi

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2102023
Journal / PublicationSmall
Volume17
Issue number35
Online published28 Jul 2021
Publication statusPublished - 2 Sep 2021

Abstract

Bismuth tungstate (Bi2WO6) thin film photoanode has exhibited an excellent photoelectrochemical (PEC) performance when the tungsten (W) concentration is increased during the fabrication. Plate-like Bi2WO6 thin film with distinct particle sizes and surface area of different exposed facets are successfully prepared via hydrothermal reaction. The smaller particle size in conjunction with higher exposure extent of electron-dominated {010} crystal facet leads to a shorter electron transport pathway to the bulk surface, assuring a lower charge transfer resistance and thus minimal energy loss. In addition, it is proposed based on the results from conductive atomic force microscopy that higher W concentration plays a crucial role in facilitating the charge transport of the thin film. The “self-doped” of W in Bi2WO6 will lead to the higher carrier density and improved conductivity. Thus, the variation in the W concentration during a synthesis can be served as a promising strategy for future W based photoanode design to achieve high photoactivity in water splitting application.

Research Area(s)

  • bismuth tungstate, charge carrier dynamics, photoanodes, photoelectrocatalysis, water oxidation

Citation Format(s)

Manipulating the Fate of Charge Carriers with Tungsten Concentration : Enhancing Photoelectrochemical Water Oxidation of Bi2WO6. / Chung, Hoi Ying; Toe, Cui Ying; Chen, Weijian; Wen, Xiaoming; Wong, Roong Jien; Amal, Rose; Abdi, Fatwa Firdaus; Ng, Yun Hau.

In: Small, Vol. 17, No. 35, 2102023, 02.09.2021.

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