Spray pyrolysis deposition and photoelectrochemical properties of n-type BiOI nanoplatelet thin films

  • Hahn N
  • Hoang S
  • Self J
 et al. 
  • 57


    Mendeley users who have this article in their library.
  • 85


    Citations of this article.


Bismuth oxy-iodide is a potentially interesting visible-light-active photocatalyst; yet there is little research regarding its photoelectrochemical properties. Herein we report the synthesis of BiOI nanoplatelet photoelectrodes by spray pyrolysis on fluorine-doped tin oxide substrates at various temperatures. The films exhibited n-type conductivity, most likely due to the presence of anion vacancies, and optimized films possessed incident photon conversion efficiencies of over 20% in the visible range for the oxidation of I(-) to I(3)(-) at 0.4 V vs Ag/AgCl in acetonitrile. Visible-light photons (λ > 420 nm) contributed approximately 75% of the overall photocurrent under AM1.5G illumination, illustrating their usefulness under solar light illumination. A deposition temperature of 260 °C was found to result in the best performance due to the balance of morphology, crystallinity, impurity levels, and optical absorption, leading to photocurrents of roughly 0.9 mA/cm(2) at 0.4 V vs Ag/AgCl. Although the films performed stably in acetonitrile, their performance decreased significantly upon extended exposure to water, which was apparently caused by a loss of surface iodine and subsequent formation of an insulating bismuth hydroxide layer.

Author-supplied keywords

  • layered semiconductor
  • solar energy
  • visible-light photocatalyst
  • water splitting

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Nathan T. Hahn

  • Son Hoang

  • Jeffrey L. Self

  • C. Buddie Mullins

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free