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Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions
Hydrogen production by photocatalytic water splitting is one of the most promising sustainable routes to store solar energy in the form of chemical bonds. To obtain significant H(2) evolution rates (HERs) a variety of defective TiO(2) catalysts were synthesized by means of procedures generally requi...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051216/ https://www.ncbi.nlm.nih.gov/pubmed/35497602 http://dx.doi.org/10.1039/d0ra01322f |
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author | Imparato, Claudio Iervolino, Giuseppina Fantauzzi, Marzia Koral, Can Macyk, Wojciech Kobielusz, Marcin D'Errico, Gerardino Rea, Ilaria Di Girolamo, Rocco De Stefano, Luca Andreone, Antonello Vaiano, Vincenzo Rossi, Antonella Aronne, Antonio |
author_facet | Imparato, Claudio Iervolino, Giuseppina Fantauzzi, Marzia Koral, Can Macyk, Wojciech Kobielusz, Marcin D'Errico, Gerardino Rea, Ilaria Di Girolamo, Rocco De Stefano, Luca Andreone, Antonello Vaiano, Vincenzo Rossi, Antonella Aronne, Antonio |
author_sort | Imparato, Claudio |
collection | PubMed |
description | Hydrogen production by photocatalytic water splitting is one of the most promising sustainable routes to store solar energy in the form of chemical bonds. To obtain significant H(2) evolution rates (HERs) a variety of defective TiO(2) catalysts were synthesized by means of procedures generally requiring highly energy-consuming treatments, e.g. hydrogenation. Even if a complete understanding of the relationship between defects, electronic structure and catalytic active sites is far from being achieved, the band gap narrowing and Ti(3+)-self-doping have been considered essential to date. In most reports a metal co-catalyst (commonly Pt) and a sacrificial electron donor (such as methanol) are used to improve HERs. Here we report the synthesis of TiO(2)/C bulk heterostructures, obtained from a hybrid TiO(2)-based gel by simple heat treatments at 400 °C under different atmospheres. The electronic structure and properties of the grey or black gel-derived powders are deeply inspected by a combination of classical and less conventional techniques, in order to identify the origin of their photoresponsivity. The defective sites of these heterostructures, namely oxygen vacancies, graphitic carbon and unpaired electrons localized on the C matrix, result in a remarkable visible light activity in spite of the lack of band gap narrowing or Ti(3+)-self doping. The materials provide HER values ranging from about 0.15 to 0.40 mmol h(−1) g(cat)(−1), under both UV- and visible-light irradiation, employing glycerol as sacrificial agent and without any co-catalyst. |
format | Online Article Text |
id | pubmed-9051216 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90512162022-04-29 Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions Imparato, Claudio Iervolino, Giuseppina Fantauzzi, Marzia Koral, Can Macyk, Wojciech Kobielusz, Marcin D'Errico, Gerardino Rea, Ilaria Di Girolamo, Rocco De Stefano, Luca Andreone, Antonello Vaiano, Vincenzo Rossi, Antonella Aronne, Antonio RSC Adv Chemistry Hydrogen production by photocatalytic water splitting is one of the most promising sustainable routes to store solar energy in the form of chemical bonds. To obtain significant H(2) evolution rates (HERs) a variety of defective TiO(2) catalysts were synthesized by means of procedures generally requiring highly energy-consuming treatments, e.g. hydrogenation. Even if a complete understanding of the relationship between defects, electronic structure and catalytic active sites is far from being achieved, the band gap narrowing and Ti(3+)-self-doping have been considered essential to date. In most reports a metal co-catalyst (commonly Pt) and a sacrificial electron donor (such as methanol) are used to improve HERs. Here we report the synthesis of TiO(2)/C bulk heterostructures, obtained from a hybrid TiO(2)-based gel by simple heat treatments at 400 °C under different atmospheres. The electronic structure and properties of the grey or black gel-derived powders are deeply inspected by a combination of classical and less conventional techniques, in order to identify the origin of their photoresponsivity. The defective sites of these heterostructures, namely oxygen vacancies, graphitic carbon and unpaired electrons localized on the C matrix, result in a remarkable visible light activity in spite of the lack of band gap narrowing or Ti(3+)-self doping. The materials provide HER values ranging from about 0.15 to 0.40 mmol h(−1) g(cat)(−1), under both UV- and visible-light irradiation, employing glycerol as sacrificial agent and without any co-catalyst. The Royal Society of Chemistry 2020-03-27 /pmc/articles/PMC9051216/ /pubmed/35497602 http://dx.doi.org/10.1039/d0ra01322f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Imparato, Claudio Iervolino, Giuseppina Fantauzzi, Marzia Koral, Can Macyk, Wojciech Kobielusz, Marcin D'Errico, Gerardino Rea, Ilaria Di Girolamo, Rocco De Stefano, Luca Andreone, Antonello Vaiano, Vincenzo Rossi, Antonella Aronne, Antonio Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title | Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title_full | Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title_fullStr | Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title_full_unstemmed | Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title_short | Photocatalytic hydrogen evolution by co-catalyst-free TiO(2)/C bulk heterostructures synthesized under mild conditions |
title_sort | photocatalytic hydrogen evolution by co-catalyst-free tio(2)/c bulk heterostructures synthesized under mild conditions |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051216/ https://www.ncbi.nlm.nih.gov/pubmed/35497602 http://dx.doi.org/10.1039/d0ra01322f |
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