Multi-spectroscopic study of electrochemically-formed oxide-derived gold electrodes.

Autor:	Bibi SB; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., El-Zohry AM; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Davies B; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa.; Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden., Grigorev V; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Goodwin CM; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Lömker P; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Holm A; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Ali-Löytty H; Surface Science Group, Photonics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere University, Finland., Garcia-Martinez F; Photon Science, Deutsches ElektronenSynchrotron (DESY), 22607 Hamburg, Germany., Schlueter C; Photon Science, Deutsches ElektronenSynchrotron (DESY), 22607 Hamburg, Germany., Soldemo M; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Koroidov S; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa., Hansson T; Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden. ahmed.elzohry@kfupm.edu.sa.
Jazyk:	angličtina
Zdroj:	Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2024 Jan 17; Vol. 26 (3), pp. 2332-2340. Date of Electronic Publication: 2024 Jan 17.
DOI:	10.1039/d3cp04009g
Abstrakt:	Oxide-derived metals are produced by reducing an oxide precursor. These materials, including gold, have shown improved catalytic performance over many native metals. The origin of this improvement for gold is not yet understood. In this study, operando non-resonant sum frequency generation (SFG) and ex situ high-pressure X-ray photoelectron spectroscopy (HP-XPS) have been employed to investigate electrochemically-formed oxide-derived gold (OD-Au) from polycrystalline gold surfaces. A range of different oxidizing conditions were used to form OD-Au in acidic aqueous medium (H 3 PO 4 , pH = 1). Our electrochemical data after OD-Au is generated suggest that the surface is metallic gold, however SFG signal variations indicate the presence of subsurface gold oxide remnants between the metallic gold surface layer and bulk gold. The HP-XPS results suggest that this subsurface gold oxide could be in the form of Au 2 O 3 or Au(OH) 3 . Furthermore, the SFG measurements show that with reducing electrochemical treatments the original gold metallic state can be restored, meaning the subsurface gold oxide is released. This work demonstrates that remnants of gold oxide persist beneath the topmost gold layer when the OD-Au is created, potentially facilitating the understanding of the improved catalytic properties of OD-Au.
Databáze:	MEDLINE
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