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

Boscolo Bibi, Sara, 1993- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
El-Zohry, Ahmed M., 1984- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Davies, Bernadette, 1997- (författare)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden;Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden
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Grigorev, Vladimir, 1992- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Goodwin, Christopher M., 1989- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Lömker, Patrick (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Holm, Alexander, 1983- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Ali-Löytty, Harri (författare)
Surface Science Group, Photonics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere University, Finland
Garcia-Martinez, Fernando (författare)
Photon Science, Deutsches ElektronenSynchrotron (DESY), 22607 Hamburg, Germany
Schlueter, Christoph (författare)
Photon Science, Deutsches ElektronenSynchrotron (DESY), 22607 Hamburg, Germany
Soldemo, Markus, 1986- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Koroidov, Sergey, 1982- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
Hansson, Tony, 1965- (författare)
Stockholms universitet,Fysikum,Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden
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 (creator_code:org_t)
Royal Society of Chemistry, 2024
2024
Engelska.
Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 26:3, s. 2332-2340
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • 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 (H3PO4, 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 Au2O3 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.

Ämnesord

NATURVETENSKAP  -- Kemi -- Annan kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

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