Photophysical Study on the Effect of the External Potential on NiO-Based Photocathodes

Kaijian Zhu, Lisanne Maxime Einhaus, Guido Mul, A. Huijser* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

In the present study, we investigate the effects of the applied external potential on a dye-sensitized NiO photocathode by time-resolved photoluminescence and femtosecond transient absorption spectroscopy under operating conditions. Instead of the anticipated acceleration of photoinduced hole injection from dye into NiO at a more negative applied potential, we observe that both hole injection and charge recombination are slowed down. We cautiously assign this effect to a variation in OH– ion concentration in the inner Helmholtz plane of the electrochemical double layer with applied potential, warranting further investigation for the realization of efficient solar fuel devices.
Original languageEnglish
Pages (from-to)5217-5224
Number of pages8
JournalACS Applied Materials and Interfaces
Volume16
Issue number4
Early online date18 Jan 2024
DOIs
Publication statusPublished - 31 Jan 2024

Keywords

  • charge recombination
  • Electrolytes
  • Ions
  • Oxides
  • Photonics
  • dye-sensitized photocathode
  • NiO
  • Photodynamics
  • in situ spectroscopy
  • Transient absorption
  • UT-Hybrid-D

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