Shape-dependent activity of anisotropic Ag nanostructures supported on TiO2 for the photoelectrocatalytic water oxidation

  • Abuzar Khan
  • Muhammad I Ahmed
  • Md. Abdul Aziz
  • Mohammad Asif
  • Hatim Dafalla
  • Mohammad QamarEmail author


Herein, we report shape-dependent photoelectrocatalytic activity of Ag/Ag2O nanostructures supported on pristine or nitrogen-doped TiO2 (NTiO2). Isotropic (spherical) and anisotropic (cubic and triangular) nanocrystals of Ag/Ag2O nanocrystals were fabricated using complexing and surface directing agents. Microscopic images confirmed the formation of nanospheres (∼ 50–60 nm), nanocubes (∼ 50–70 nm), triangular nanoplates (∼ 40–60 nm). The X-ray photoelectron spectroscopy indicated the presence of metallic silver (Ag0) and oxidized silver (Ag+). The as-prepared photoelectrodes were illuminated by Ultraviolet–Visible (λ = 300–600 nm) or visible radiations (λ = > 420 nm), and photoelectrochemical oxidation of water was examined. The findings indicate a significant correlation in the shape of Ag/Ag2O nanostructures, the incident wavelength, and the photoelectrochemical performance. In addition, different performance trend was discerned under Ultraviolet–Visible and visible excitations with respect to the amount of deposited Ag/Ag2O. The variation in activity observed with different shapes of Ag/Ag2O was correlated to enhanced optical property, arising due to the anisotropic structure, and electrical conductivity.



This project was funded by National Plan for Science, Technology, and Innovation (MAARIFAH), King Abdul-Aziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM), Kingdom of Saudi Arabia, Award Number (13-NAN1627-04).

Supplementary material

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Supplementary material 1 (DOCX 71 KB)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Abuzar Khan
    • 1
  • Muhammad I Ahmed
    • 1
  • Md. Abdul Aziz
    • 1
  • Mohammad Asif
    • 2
  • Hatim Dafalla
    • 3
  • Mohammad Qamar
    • 1
    Email author
  1. 1.Center of Excellence in Nanotechnology (CENT)King Fahd University of Petroleum and MineralsDhahranKingdom of Saudi Arabia
  2. 2.Center of Environment and Water (CEW)King Fahd University of Petroleum and MineralsDhahranKingdom of Saudi Arabia
  3. 3.Center for Engineering Research (CER)King Fahd University of Petroleum and MineralsDhahranKingdom of Saudi Arabia

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