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

Journal of Materials Science: Materials in Electronics, ISSN: 1573-482X, Vol: 30, Issue: 2, Page: 1510-1518
2019
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Article Description

Herein, we report shape-dependent photoelectrocatalytic activity of Ag/AgO nanostructures supported on pristine or nitrogen-doped TiO (NTiO). Isotropic (spherical) and anisotropic (cubic and triangular) nanocrystals of Ag/AgO 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 (Ag) 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/AgO 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/AgO. The variation in activity observed with different shapes of Ag/AgO was correlated to enhanced optical property, arising due to the anisotropic structure, and electrical conductivity.

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