Low-bias photoelectrochemical water splitting via mediating trap states and small polaron hopping

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

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Author(s)

  • Hao Wu
  • Lei Zhang
  • Aijun Du
  • Rowshanak Irani
  • Roel van de Krol

Detail(s)

Original languageEnglish
Article number6231
Journal / PublicationNature Communications
Volume13
Online published20 Oct 2022
Publication statusPublished - 2022

Link(s)

Abstract

Metal oxides are promising for photoelectrochemical (PEC) water splitting due to their robustness and low cost. However, poor charge carrier transport impedes their activity, particularly at low-bias voltage. Here we demonstrate the unusual effectiveness of phosphorus doping into bismuth vanadate (BiVO4) photoanode for efficient low-bias PEC water splitting. The resulting BiVO4 photoanode shows a separation efficiency of 80% and 99% at potentials as low as 0.6 and 1.0 VRHE, respectively. Theoretical simulation and experimental analysis collectively verify that the record performance originates from the unique phosphorus-doped BiVO4 configuration with concurrently mediated carrier density, trap states, and small polaron hopping. With NiFeOx cocatalyst, the BiVO4 photoanode achieves an applied bias photon-to-current efficiency of 2.21% at 0.6 VRHE. The mechanistic understanding of the enhancement of BiVO4 properties provides key insights in trap state passivation and polaron hopping for most photoactive metal oxides. © 2022, The Author(s).

Research Area(s)

Citation Format(s)

Low-bias photoelectrochemical water splitting via mediating trap states and small polaron hopping. / Wu, Hao; Zhang, Lei; Du, Aijun et al.
In: Nature Communications, Vol. 13, 6231, 2022.

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

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