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Photocatalytic activity and electron storage capability of TiO2 aerogels with adjustable surface area

Rose, Alexandra and Hofmann, Anja and Voepel, Pascal and Milow, Barbara and Marschall, Roland (2022) Photocatalytic activity and electron storage capability of TiO2 aerogels with adjustable surface area. ACS Applied Energy Materials. American Chemical Society (ACS). doi: 10.1021/acsaem.2c02517. ISSN 2574-0962.

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Official URL: https://pubs.acs.org/doi/10.1021/acsaem.2c02517

Abstract

Mesoporous TiO2 aerogels with a surface area larger than 600 m2 g–1 have been prepared via acid-catalyzed sol–gel synthesis and supercritical drying. Varying temperature treatments in air result in changes in the morphology of the aerogels and their specific surface area. Interestingly, the ability to store photogenerated electrons in the surface states of the aerogels upon illumination of dispersions in water–methanol mixtures increases at lower calcination temperatures. Additionally, the extent of electron storage capability also depends on hole scavenger concentration. Increasing the calcination temperature to 500 °C results in a decreased surface area and electron storage capability but increased hydrogen evolution rates. Finally, nitrogen reduction to ammonia in the dark is performed with photogenerated stored electrons in TiO2 aerogels, separating the charge carrier photogeneration from the dark reduction reaction.

Item URL in elib:https://elib.dlr.de/190501/
Document Type:Article
Title:Photocatalytic activity and electron storage capability of TiO2 aerogels with adjustable surface area
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Rose, AlexandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hofmann, AnjaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Voepel, PascalUNSPECIFIEDhttps://orcid.org/0000-0001-8233-7261UNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Marschall, RolandUNSPECIFIEDhttps://orcid.org/0000-0002-1057-0459UNSPECIFIED
Date:28 November 2022
Journal or Publication Title:ACS Applied Energy Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1021/acsaem.2c02517
Publisher:American Chemical Society (ACS)
ISSN:2574-0962
Status:Published
Keywords:TiO2 aerogel electron storage photocatalysis hydrogen production nitrogen reduction
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Chemical Energy Carriers
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Rose, Alexandra
Deposited On:01 Feb 2023 10:44
Last Modified:01 Dec 2023 03:00

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