Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | e202100272 |
| Seitenumfang | 9 |
| Fachzeitschrift | ChemPhotoChem |
| Jahrgang | 6 |
| Ausgabenummer | 7 |
| Frühes Online-Datum | 20 Juli 2022 |
| Publikationsstatus | Veröffentlicht - Juli 2022 |
Abstract
Hexaniobate nanosheets (K4−xHxNb6O17) were combined with Cu2+ ions by grafting, a green one-step methodology. The resulted nanocomposite exhibits high surface area with most of the Cu2+ ions strongly connected to the hexaniobate layers as amorphous nanoclusters. Photocatalytic experiments evidence that the Cu-grafted hexaniobate can act as an efficient photocatalyst for H2 evolution. The best performance for the Cu-grafted hexaniobate was reached when the Cu concentration was 0.5 wt% (1.62±0.10 mmo g−1 h−1), whereas hexaniobate layers with 0.5 wt % photodeposited Pt exhibited a hydrogen evolution rate of 0.95±0.04 mmol h−1 g−1 under the same experimental conditions. Grafting leads to covalently bounded Cu species onto the hexaniobate surface, ensuring a strong electronic interaction. Detailed XPS and EPR studies evidence that the initial Cu2+ species are promptly reduced to Cu1+/Cu0 under illumination. The prominent performance of Cu-grafted samples was related to the improved charge-separation efficiency as shown by ns-transient spectroscopy. Therefore, the present methodology offers a green option to produce efficient Earth-abundant-based photocatalysts for H2 evolution.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Analytische Chemie
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Chemie (insg.)
- Organische Chemie
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in: ChemPhotoChem, Jahrgang 6, Nr. 7, e202100272, 07.2022.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Efficient Photocatalytic H2 Evolution by Hexaniobate Nanosheets Grafted with Copper Nanoclusters
AU - Nascimento Nunes, Barbara
AU - Bahnemann, Detlef W.
AU - Otavio T. Patrocinio, Antonio
N1 - Funding Information: B.N.N. and A.O.T.P. thank Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 406392/2018-8 and 310303/2018-4), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). B.N.N. gratefully acknowledges the financial support from CAPES, Brazil, from the CAPES/DAAD/CNPQ (15/2017) program, grant number 88887.161403/2017-00. A.O.T.P. is also thankful to the Alexander von Humboldt Foundation for the equipment subsidy grant. D.W.B. acknowledges financial support from Saint Petersburg State University (Research Grant 39054581). The authors also thank Prof. Osmando Lopes, Heinrich Hartmann and Astrid Besmehn from the Central Institute for Engineering, Electronics and Analytics (ZEA-3), Forschungszentrum Jülich GmbH for the XPS measurements; Institute of Geology, Leibniz University Hannover for ICP-OES measurements; Laboratorium für Nano- und Quantenengineering (LNQE) for TEM equipment; and the Grupo de Materiais Inorgânicos do Triângulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14).
PY - 2022/7
Y1 - 2022/7
N2 - Hexaniobate nanosheets (K4−xHxNb6O17) were combined with Cu2+ ions by grafting, a green one-step methodology. The resulted nanocomposite exhibits high surface area with most of the Cu2+ ions strongly connected to the hexaniobate layers as amorphous nanoclusters. Photocatalytic experiments evidence that the Cu-grafted hexaniobate can act as an efficient photocatalyst for H2 evolution. The best performance for the Cu-grafted hexaniobate was reached when the Cu concentration was 0.5 wt% (1.62±0.10 mmo g−1 h−1), whereas hexaniobate layers with 0.5 wt % photodeposited Pt exhibited a hydrogen evolution rate of 0.95±0.04 mmol h−1 g−1 under the same experimental conditions. Grafting leads to covalently bounded Cu species onto the hexaniobate surface, ensuring a strong electronic interaction. Detailed XPS and EPR studies evidence that the initial Cu2+ species are promptly reduced to Cu1+/Cu0 under illumination. The prominent performance of Cu-grafted samples was related to the improved charge-separation efficiency as shown by ns-transient spectroscopy. Therefore, the present methodology offers a green option to produce efficient Earth-abundant-based photocatalysts for H2 evolution.
AB - Hexaniobate nanosheets (K4−xHxNb6O17) were combined with Cu2+ ions by grafting, a green one-step methodology. The resulted nanocomposite exhibits high surface area with most of the Cu2+ ions strongly connected to the hexaniobate layers as amorphous nanoclusters. Photocatalytic experiments evidence that the Cu-grafted hexaniobate can act as an efficient photocatalyst for H2 evolution. The best performance for the Cu-grafted hexaniobate was reached when the Cu concentration was 0.5 wt% (1.62±0.10 mmo g−1 h−1), whereas hexaniobate layers with 0.5 wt % photodeposited Pt exhibited a hydrogen evolution rate of 0.95±0.04 mmol h−1 g−1 under the same experimental conditions. Grafting leads to covalently bounded Cu species onto the hexaniobate surface, ensuring a strong electronic interaction. Detailed XPS and EPR studies evidence that the initial Cu2+ species are promptly reduced to Cu1+/Cu0 under illumination. The prominent performance of Cu-grafted samples was related to the improved charge-separation efficiency as shown by ns-transient spectroscopy. Therefore, the present methodology offers a green option to produce efficient Earth-abundant-based photocatalysts for H2 evolution.
KW - copper
KW - hydrogen
KW - niobium oxides
KW - photocatalysis
KW - surface modification
UR - http://www.scopus.com/inward/record.url?scp=85124127406&partnerID=8YFLogxK
U2 - 10.1002/cptc.202100272
DO - 10.1002/cptc.202100272
M3 - Article
AN - SCOPUS:85124127406
VL - 6
JO - ChemPhotoChem
JF - ChemPhotoChem
IS - 7
M1 - e202100272
ER -