Details
| Original language | English |
|---|---|
| Pages (from-to) | 8371-8380 |
| Number of pages | 10 |
| Journal | ACS Applied Energy Materials |
| Volume | 5 |
| Issue number | 7 |
| Early online date | 27 Jun 2022 |
| Publication status | Published - 25 Jul 2022 |
Abstract
Highly stable Au/K 4-xH xNb 6O 17nanocomposites were prepared by employing photochemically made Au nanoparticles surrounded by branched poly(ethyleneimine) (PEI) and successfully applied as photocatalysts for H 2evolution. The nanocomposites were prepared in a single step by the pH control of the surface charges of the respective materials. The resulting nanocomposites with different Au loadings were fully characterized and compared with their counterparts in which plain Au nanoparticles were photodeposited on the hexaniobate. Vibrational and X-ray photoelectron spectroscopy evidenced that the Au(PEI) nanoparticles are strongly adsorbed onto the hexaniobate and cause substantial changes in the electronic density of their surface atoms. Following band gap excitation, electrons are efficiently transferred to the Au(PEI) nanoparticles as evidenced by electron paramagnetic resonance spectroscopy. The nanocomposites are able to promote H 2evolution from methanol/water mixtures under ultraviolet-visible (UV-vis) irradiation with rates up to 294 ± 20 μmol h -1g -1for the 2% wt. Au(PEI)/hexaniobate, corresponding to an apparent quantum yield of 1.1 ± 0.1%. This performance is similar to that obtained for the photodeposited nanocomposite with analogous Au loading, but the new composite was at least three times more stable under long-term irradiation. The photocatalytic behavior of the Au(PEI)/hexaniobate was rationalized based on detailed spectroscopic and morphologic characterizations, providing new insights for the development of robust photocatalysts based on two-dimensional (2D) metal oxide semiconductors.
Keywords
- Au-based photocatalysts, H production, layered materials, photoactive nanocomposites
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemical Engineering (miscellaneous)
- Energy(all)
- Energy Engineering and Power Technology
- Materials Science(all)
- Materials Chemistry
- Engineering(all)
- Electrical and Electronic Engineering
- Chemistry(all)
- Electrochemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: ACS Applied Energy Materials, Vol. 5, No. 7, 25.07.2022, p. 8371-8380.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Highly Stable Au/Hexaniobate Nanocomposite Prepared by a Green Intercalation Method for Photoinduced H2 Evolution Applications
AU - Alves, Higor O.
AU - Frachoni, Brenda S. D.
AU - Nunes, Barbara N.
AU - Teixeira, Priscila R.
AU - Paniago, Roberto M.
AU - Bahnemann, Detlef W.
AU - Paterno, Leonardo G.
AU - Patrocinio, Antonio Otavio T.
N1 - Funding Information: The authors are thankful to Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, APQ-01044-21; RED-00520-16), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 307804/2021-6), 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).
PY - 2022/7/25
Y1 - 2022/7/25
N2 - Highly stable Au/K 4-xH xNb 6O 17nanocomposites were prepared by employing photochemically made Au nanoparticles surrounded by branched poly(ethyleneimine) (PEI) and successfully applied as photocatalysts for H 2evolution. The nanocomposites were prepared in a single step by the pH control of the surface charges of the respective materials. The resulting nanocomposites with different Au loadings were fully characterized and compared with their counterparts in which plain Au nanoparticles were photodeposited on the hexaniobate. Vibrational and X-ray photoelectron spectroscopy evidenced that the Au(PEI) nanoparticles are strongly adsorbed onto the hexaniobate and cause substantial changes in the electronic density of their surface atoms. Following band gap excitation, electrons are efficiently transferred to the Au(PEI) nanoparticles as evidenced by electron paramagnetic resonance spectroscopy. The nanocomposites are able to promote H 2evolution from methanol/water mixtures under ultraviolet-visible (UV-vis) irradiation with rates up to 294 ± 20 μmol h -1g -1for the 2% wt. Au(PEI)/hexaniobate, corresponding to an apparent quantum yield of 1.1 ± 0.1%. This performance is similar to that obtained for the photodeposited nanocomposite with analogous Au loading, but the new composite was at least three times more stable under long-term irradiation. The photocatalytic behavior of the Au(PEI)/hexaniobate was rationalized based on detailed spectroscopic and morphologic characterizations, providing new insights for the development of robust photocatalysts based on two-dimensional (2D) metal oxide semiconductors.
AB - Highly stable Au/K 4-xH xNb 6O 17nanocomposites were prepared by employing photochemically made Au nanoparticles surrounded by branched poly(ethyleneimine) (PEI) and successfully applied as photocatalysts for H 2evolution. The nanocomposites were prepared in a single step by the pH control of the surface charges of the respective materials. The resulting nanocomposites with different Au loadings were fully characterized and compared with their counterparts in which plain Au nanoparticles were photodeposited on the hexaniobate. Vibrational and X-ray photoelectron spectroscopy evidenced that the Au(PEI) nanoparticles are strongly adsorbed onto the hexaniobate and cause substantial changes in the electronic density of their surface atoms. Following band gap excitation, electrons are efficiently transferred to the Au(PEI) nanoparticles as evidenced by electron paramagnetic resonance spectroscopy. The nanocomposites are able to promote H 2evolution from methanol/water mixtures under ultraviolet-visible (UV-vis) irradiation with rates up to 294 ± 20 μmol h -1g -1for the 2% wt. Au(PEI)/hexaniobate, corresponding to an apparent quantum yield of 1.1 ± 0.1%. This performance is similar to that obtained for the photodeposited nanocomposite with analogous Au loading, but the new composite was at least three times more stable under long-term irradiation. The photocatalytic behavior of the Au(PEI)/hexaniobate was rationalized based on detailed spectroscopic and morphologic characterizations, providing new insights for the development of robust photocatalysts based on two-dimensional (2D) metal oxide semiconductors.
KW - Au-based photocatalysts
KW - H production
KW - layered materials
KW - photoactive nanocomposites
UR - http://www.scopus.com/inward/record.url?scp=85135841758&partnerID=8YFLogxK
U2 - 10.1021/acsaem.2c00918
DO - 10.1021/acsaem.2c00918
M3 - Article
VL - 5
SP - 8371
EP - 8380
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 7
ER -