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  In-Situ X-ray Spectroscopy of the Electric Double Layer around TiO2 Nanoparticles Dispersed in Aqueous Solution: Implications for H2 Generation

Ali, H., Golnak, R., Seidel, R., Winter, B., & Xiao, J. (2020). In-Situ X-ray Spectroscopy of the Electric Double Layer around TiO2 Nanoparticles Dispersed in Aqueous Solution: Implications for H2 Generation. ACS Applied Nano Materials, 3(1), 264-273. doi:10.1021/acsanm.9b01939.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-65DE-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-A204-F
Genre: Journal Article

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 Creators:
Ali, Hebatallah1, 2, Author              
Golnak, Ronny3, Author
Seidel, Robert4, 5, Author
Winter, Bernd1, Author              
Xiao, Jie3, Author
Affiliations:
1Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
2Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany, ou_persistent22              
3Helmholtz-Zentrum Berlin für Materialien und Energie, Department of Highly Sensitive X-ray Spectroscopy, Albert-Einstein-Straße 15, D-12489 Berlin, Germany, ou_persistent22              
4Helmholtz-Zentrum Berlin für Materialien und Energie, Department of Operando Interfacial Photochemistry, Albert-Einstein-Straße 15, D-12489 Berlin, Germany, ou_persistent22              
5Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, D-12489 Berlin, Germany, ou_persistent22              

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Free keywords: Electric double layer; TiO2 nanoparticles; Water dissociation; Liquid microjet; Photoelectron spectroscopy; X-ray absorption spectroscopy
 Abstract: We report an experimental observation of a significant amount of hydroxide OH- created upon water dissociation and subsequently trapped around TiO2 nanoparticles dispersed in NH4OH aqueous solution. The hydroxide species is identified and quantified by a combination of photoemission and photon-emission X-ray spectroscopies conducted on liquid samples using a liquid microjet. Unlike previous X-ray studies that observed only a few monolayers of water coverage on TiO2 surfaces and found maximally sub-monolayer of OH-, the true aqueous environment adopted in this study enables ion mobility and the separation of the water dissociation products H+/OH-. This facilitates the formation of a multilayer OH- diffuse layer in which the trapped OH-ions are discovered to coordinate with three water molecules to form a tetrahedral hydration configuration. The negatively charged diffuse layers, together with the positive NH4+ Stern layers, constitutes > 0.8-nm-thick electric double layers around the TiO2 nanoparticles. The large observed amount of hydroxide indicates a high efficiency of water dissociation for the TiO2 catalyst, a promising result for H2 generation in true aqueous environments.

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Language(s): eng - English
 Dates: 2019-10-072019-12-172020
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsanm.9b01939
 Degree: -

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Title: ACS Applied Nano Materials
  Abbreviation : ACS Appl. Nano Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C., USA : American Chemical Society
Pages: - Volume / Issue: 3 (1) Sequence Number: - Start / End Page: 264 - 273 Identifier: ISSN: 2574-0970
CoNE: https://pure.mpg.de/cone/journals/resource/xx