Water-mediated photo-induced reduction of platinum films

Jordi Fraxedas; Kuan Zhang; Borja Sepúlveda; María José Esplandiu; Xènia García De Andrés; Jordi Llorca; Virginia Pérez-Dieste; Carlos Escudero

doi:https://doi.org/10.1107/S1600577519004685

Water-mediated photo-induced reduction of platinum films

Jordi Fraxedas, Kuan Zhang, Borja Sepúlveda, María José Esplandiu, Xènia García De Andrés, Jordi Llorca, Virginia Pérez-Dieste, Carlos Escudero

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Abstract

© 2019 International Union of Crystallography. Platinum thin films activated ex situ by oxygen plasma become reduced by the combined effect of an intense soft X-ray photon beam and condensed water. The evolution of the electronic structure of the surface has been characterized by near-ambient-pressure photoemission and mimics the inverse two-step sequence observed in the electro-oxidation of platinum, i.e. the surface-oxidized platinum species are reduced first and then the adsorbed species desorb in a second step leading to a surface dominated by metallic platinum. The comparison with measurements performed under high-vacuum conditions suggests that the reduction process is mainly induced by the reactive species generated by the radiolysis of water. When the photon flux is decreased, then the reduction process becomes slower.

Original language	English
Pages (from-to)	1288-1293
Journal	Journal of Synchrotron Radiation
Volume	26
DOIs	https://doi.org/10.1107/S1600577519004685
Publication status	Published - 1 Jul 2019

Keywords

Beam damage
Near-ambient-pressure photoemission
Platinum oxides
Water

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https://ddd.uab.cat/record/234001

Cite this

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title = "Water-mediated photo-induced reduction of platinum films",

abstract = "{\textcopyright} 2019 International Union of Crystallography. Platinum thin films activated ex situ by oxygen plasma become reduced by the combined effect of an intense soft X-ray photon beam and condensed water. The evolution of the electronic structure of the surface has been characterized by near-ambient-pressure photoemission and mimics the inverse two-step sequence observed in the electro-oxidation of platinum, i.e. the surface-oxidized platinum species are reduced first and then the adsorbed species desorb in a second step leading to a surface dominated by metallic platinum. The comparison with measurements performed under high-vacuum conditions suggests that the reduction process is mainly induced by the reactive species generated by the radiolysis of water. When the photon flux is decreased, then the reduction process becomes slower.",

keywords = "Beam damage, Near-ambient-pressure photoemission, Platinum oxides, Water",

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doi = "https://doi.org/10.1107/S1600577519004685",

language = "English",

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TY - JOUR

T1 - Water-mediated photo-induced reduction of platinum films

AU - Fraxedas, Jordi

AU - Zhang, Kuan

AU - Sepúlveda, Borja

AU - Esplandiu, María José

AU - De Andrés, Xènia García

AU - Llorca, Jordi

AU - Pérez-Dieste, Virginia

AU - Escudero, Carlos

PY - 2019/7/1

Y1 - 2019/7/1

N2 - © 2019 International Union of Crystallography. Platinum thin films activated ex situ by oxygen plasma become reduced by the combined effect of an intense soft X-ray photon beam and condensed water. The evolution of the electronic structure of the surface has been characterized by near-ambient-pressure photoemission and mimics the inverse two-step sequence observed in the electro-oxidation of platinum, i.e. the surface-oxidized platinum species are reduced first and then the adsorbed species desorb in a second step leading to a surface dominated by metallic platinum. The comparison with measurements performed under high-vacuum conditions suggests that the reduction process is mainly induced by the reactive species generated by the radiolysis of water. When the photon flux is decreased, then the reduction process becomes slower.

AB - © 2019 International Union of Crystallography. Platinum thin films activated ex situ by oxygen plasma become reduced by the combined effect of an intense soft X-ray photon beam and condensed water. The evolution of the electronic structure of the surface has been characterized by near-ambient-pressure photoemission and mimics the inverse two-step sequence observed in the electro-oxidation of platinum, i.e. the surface-oxidized platinum species are reduced first and then the adsorbed species desorb in a second step leading to a surface dominated by metallic platinum. The comparison with measurements performed under high-vacuum conditions suggests that the reduction process is mainly induced by the reactive species generated by the radiolysis of water. When the photon flux is decreased, then the reduction process becomes slower.

KW - Beam damage

KW - Near-ambient-pressure photoemission

KW - Platinum oxides

KW - Water

U2 - https://doi.org/10.1107/S1600577519004685

DO - https://doi.org/10.1107/S1600577519004685

M3 - Article

C2 - 31274456

SN - 0909-0495

VL - 26

SP - 1288

EP - 1293

JO - Journal of Synchrotron Radiation

JF - Journal of Synchrotron Radiation

ER -

Water-mediated photo-induced reduction of platinum films

Abstract

Keywords

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