Effect of Water Adsorption on Carrier Trapping Dynamics at the Surface of Anatase TiO2 Nanoparticles

Nano Letters
Kenji ShiraiYoshiyasu Matsumoto

Abstract

Charge carrier trapping plays a vital role in heterogeneous photocatalytic water splitting because it strongly affects the dynamics of photogenerated charges and hence the photoconversion efficiency. Although hole trapping by water at water/photocatalyst interface is the first step of oxygen evolution in water splitting, little has been known on how water adsorbate itself is involved in hole trapping dynamics. To clarify this point, we have performed infrared transient and steady-state absorption spectroscopy of anatase TiO2 nanoparticles as a function of the number of water adsorbate layers. Here, we demonstrate that water molecules reversibly adsorbed in the first layer on TiO2 nanoparticles are capable to trap photogenerated holes, while water in the second layer hydrogen bonding to the first-layer water makes hole trapping less effective.

References

Sep 8, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Antonio Tilocca, Annabella Selloni
Jul 18, 2006·Nature Materials·Xue-Qing GongUlrike Diebold
Oct 13, 2006·Chemical Reviews·Tracy L Thompson, John T Yates
Jun 14, 2014·Chemical Reviews·Filippo De AngelisAnnabella Selloni

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Citations

Aug 31, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yaron Paz
Mar 21, 2020·Chemical Communications : Chem Comm·Moon-Ju KimJae-Chul Pyun
Nov 4, 2017·The Journal of Chemical Physics·Daniele SelliCristiana Di Valentin
Mar 10, 2021·The Journal of Chemical Physics·Tina Jingyan Miao, Junwang Tang
May 9, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Sho KanoHiroaki Abe
Apr 18, 2017·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Anton LitkeJan P Hofmann
Jun 29, 2018·ACS Applied Materials & Interfaces·Gianluca FazioCristiana Di Valentin
Jan 13, 2018·Journal of the American Chemical Society·Kenji ShiraiYoshiyasu Matsumoto

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