Please use this identifier to cite or link to this item: doi:10.22028/D291-38647
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Title: Titania hybrid carbon spherogels for photocatalytic hydrogen evolution
Author(s): Torres-Rodríguez, Jorge
Myakala, Stephen Nagaraju
Salihovic, Miralem
Musso, Maurizio
Hüsing, Nicola
Eder, Dominik
Presser, Volker
Cherevan, Alexey
Elsaesser, Michael S.
Language: English
Title: Carbon : an international journal sponsored by the American Carbon Society
Volume: 202
Pages: 487-494
Publisher/Platform: Elsevier
Year of Publication: 2023
Free key words: Hybrid aerogels
Nanoporous materials
Hollow carbon spheres
Hydrogen evolution reaction
DDC notations: 540 Chemistry
Publikation type: Journal Article
Abstract: Recently, carbon spherogels have been introduced as a novel monolithic aerogel composed of hollow spheres. This material is conveniently obtained via polystyrene (PS) sphere templating. In the present study, we apply a water-soluble titania precursor (titanium(IV) bis(ammonium lactate) to the aqueous sol-gel synthesis based on resorcinol-formaldehyde (RF) to effectively encapsulate titania. In this way, a very high mass loading of up to 59 mass% of titania can be confined strictly to the inside of the hollow carbon spheres. In the final synthesis step, carbonization at 800 °C has three simultaneous effects: Transformation of the RF coating on PS into microporous carbon, PS template removal by decomposition, and formation of titania due to precursor dissociation. A deliberate tuning of the microporous carbon shell, accessibility of the titania, titania amount, and titania's polymorph is further demonstrated by thermal treatment under a carbon dioxide atmosphere. In contrast to non-tuned or TiC-containing carbon spherogels, CO2 activation of the composites results in a three orders of magnitude rise of their photocatalytic activity towards hydrogen evolution reaction, which we evaluate using flow and batch reactors. We further show that this effect is related to the partial etching of the carbon shell, which renders the TiO2 surface accessible to the reactants in the solution and allows for an efficient hole scavenging. Given the simplicity of the hybrid carbon spherogel (HCS) composite fabrication, the high degree of control of their morphological characteristics, and the striking effects of CO2-activation on performance, we believe that our results will contribute to the development of similar carbon-inorganic composites.
DOI of the first publication: 10.1016/j.carbon.2022.10.073
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-386475
ISSN: 0008-6223
Date of registration: 20-Jan-2023
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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