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Title: Photocatalytic water splitting by N-TiO2 on MgO (111) with exceptional quantum efficiencies at elevated temperatures
Authors: Li, YY
Peng, YK
Hu, L 
Zheng, JW
Prabhakaran, D
Wu, S
Puchtler, TJ
Li, M
Wong, KY 
Taylor, RA
Tsang, SCE
Issue Date: 2019
Source: Nature communications, 27 Sept. 2019, v. 10, 4421, p. 1-9
Abstract: Photocatalytic water splitting is attracting enormous interest for the storage of solar energy but no practical method has yet been identified. In the past decades, various systems have been developed but most of them suffer from low activities, a narrow range of absorption and poor quantum efficiencies (Q.E.) due to fast recombination of charge carriers. Here we report a dramatic suppression of electron-hole pair recombination on the surface of N-doped TiO2 based nanocatalysts under enhanced concentrations of H+ and OH-, and local electric field polarization of a MgO (111) support during photolysis of water at elevated temperatures. Thus, a broad optical absorption is seen, producing O-2 and H-2 in a 1:2 molar ratio with a H-2 evolution rate of over 11,000 mu mol g(-1)h(-1) without any sacrificial reagents at 270 degrees C. An exceptional range of Q.E. from 81.8% at 437 nm to 3.2% at 1000 nm is also reported.
Publisher: Nature Publishing Group
Journal: Nature communications 
EISSN: 2041-1723
DOI: 10.1038/s41467-019-12385-1
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visithttp://creativecommons.org/licenses/by/4.0/.
© The Author(s) 2019
The following publication Li, Y., Peng, Y., Hu, L. et al. Photocatalytic water splitting by N-TiO2 on MgO (111) with exceptional quantum efficiencies at elevated temperatures. Nat Commun 10, 4421 (2019), 1-9 is available at https://dx.doi.org/10.1038/s41467-019-12385-1
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