Unveiling Carrier Dynamics in Periodic Porous BiVOPhotocatalyst for Enhanced Solar Water Splitting

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

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Author(s)

  • Hao Wu
  • Rowshanak Irani
  • Kunfeng Zhang
  • Lin Jing
  • Hongxing Dai
  • Hoi Ying Chung
  • Fatwa F. Abdi

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)3400-3407
Journal / PublicationACS Energy Letters
Volume6
Issue number10
Online published3 Sep 2021
Publication statusPublished - 8 Oct 2021

Abstract

Improved photocatalytic activities in highly ordered porous photocatalysts are often attributed to the larger surface area, higher light absorption, and suppressed charge recombination. Other underlying reasons for the improved charge transport, however, remain elusive at this stage. Herein, 3DOM BiVO4 photocatalysts are examined to understand the carrier dynamics and their effects in photocatalytic water splitting. Quantum confinement arising from the ultrathin and crystalline wall upshifted its conduction band, enabling photocatalytic proton reduction to hydrogen gas under visible-light illumination. Time-resolved microwave conductivity spectroscopy reveals its ∼6 times higher charge mobility and longer charge diffusion length relative to the bulk counterpart. The long lifetime (∼360 ns) of 3DOM BiVO4 with a power-law decay suggests the improved charge separation and the formation of shallow trapping states. Further investigation by Kelvin probe force microscope discloses a built-in electric field with upward band bending from the internal wall to the interconnection part of 3DOM BiVO4.

Citation Format(s)

Unveiling Carrier Dynamics in Periodic Porous BiVOPhotocatalyst for Enhanced Solar Water Splitting. / Wu, Hao; Irani, Rowshanak; Zhang, Kunfeng et al.

In: ACS Energy Letters, Vol. 6, No. 10, 08.10.2021, p. 3400-3407.

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