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Intrinsically Ru-doped suboxide TiO2nanotubes for enhanced photoelectrocatalytic H2generation

Khorashadizade, E ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.jpcc.1c00459
  3. Publisher: American Chemical Society , 2021
  4. Abstract:
  5. In the present research, we investigate the synergistic effects of Ru-doping and Ar/H2 reduction treatment on the photoelectrochemical water splitting performance and hydrogen evolution rate of TiO2 nanotube array photoelectrodes. The Ti-Ru alloy with 0.2 at. % Ru was used to grow anodic self-organized Ru-doped TiO2 nanotube layers. An ideal synergy between Ar/H2 reduction treatment and Ru-doping results in the extended absorption toward the visible light region and improved photoelectrocatalytic activity. The black Ru-doped TiO2-x photoanode's water splitting rate improves remarkably (∼ninefold) compared to the black TiO2-x sample (∼twofold). Moreover, the black Ru-doped TiO2-x photoanode shows a considerable increase in the H2 production rate (1.91 μmol h-1 cm-2) compared with the pristine TiO2 nanotube layer (0.044 μmol h-1 cm-2). We have also developed an ab initio model of pristine, Ru-doped, and Ru-doped hydrogenated TiO2 nanotubes to rationalize our experimental findings from the theoretical perspective. © 2021 American Chemical Society. All rights reserved
  6. Keywords:
  7. Binary alloys ; Hydrogen production ; Nanotubes ; Oxide minerals ; Ruthenium compounds ; Titanium alloys ; Titanium dioxide ; Water treatment ; Ab initio modeling ; Hydrogen evolution rate ; Photoelectrocatalytic ; Photoelectrocatalytic activities ; Photoelectrochemical water splitting ; Reduction treatment ; TiO2 nanotube arrays ; Visible light region ; Ruthenium alloys
  8. Source: Journal of Physical Chemistry C ; Volume 125, Issue 11 , 2021 , Pages 6116-6127 ; 19327447 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acs.jpcc.1c00459