Efficient Photocatalytic H2 Evolution by Hexaniobate Nanosheets Grafted with Copper Nanoclusters

Standard

Efficient Photocatalytic H₂ Evolution by Hexaniobate Nanosheets Grafted with Copper Nanoclusters. / Nascimento Nunes, Barbara; Bahnemann, Detlef W.; Otavio T. Patrocinio, Antonio.

в: ChemPhotoChem, Том 6, № 7, e202100272, 07.2022.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

Author

Nascimento Nunes, Barbara ; Bahnemann, Detlef W. ; Otavio T. Patrocinio, Antonio. / Efficient Photocatalytic H₂ Evolution by Hexaniobate Nanosheets Grafted with Copper Nanoclusters. в: ChemPhotoChem. 2022 ; Том 6, № 7.

BibTeX

@article{67d1f38eadf14a989af45494ef9e6b72,

title = "Efficient Photocatalytic H2 Evolution by Hexaniobate Nanosheets Grafted with Copper Nanoclusters",

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.",

keywords = "copper, hydrogen, niobium oxides, photocatalysis, surface modification",

author = "{Nascimento Nunes}, Barbara and Bahnemann, {Detlef W.} and {Otavio T. Patrocinio}, Antonio",

note = "Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH",

year = "2022",

month = jul,

doi = "10.1002/cptc.202100272",

language = "English",

volume = "6",

journal = "ChemPhotoChem",

issn = "2367-0932",

publisher = "Wiley-Blackwell",

number = "7",

}

RIS

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

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

UR - https://www.mendeley.com/catalogue/77750dcc-a142-31a1-9095-f25bb7550658/

U2 - 10.1002/cptc.202100272

DO - 10.1002/cptc.202100272

M3 - Article

AN - SCOPUS:85124127406

VL - 6

JO - ChemPhotoChem

JF - ChemPhotoChem

SN - 2367-0932

IS - 7

M1 - e202100272

ER -

ID: 95016564