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dc.contributor.author
Navarro-Senent, Cristina
dc.contributor.author
Pané, Salvador
dc.contributor.author
Sort, Jordi
dc.contributor.author
Pellicer, Eva
dc.date.accessioned
2020-09-09T14:26:26Z
dc.date.available
2020-09-04T20:18:08Z
dc.date.available
2020-09-09T14:26:26Z
dc.date.issued
2020-10-20
dc.identifier.issn
0013-4686
dc.identifier.issn
1873-3859
dc.identifier.issn
000031983
dc.identifier.other
10.1016/j.electacta.2020.136940
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/438633
dc.description.abstract
Mesoporous thin films are currently awaking a considerable interest for their prospective use in applications ranging from catalysis to energy storage. Yet, some of the synthetic parameters enabling a reproducible development of mesoporosity remain uncontrolled. In this research, we demonstrate that a subtle change in the procedure for the electrolyte preparation for the electrosynthesis of mesoporous Co‒Pt films is critical for reproducing the mesoporosity of the alloys. Specifically, we show that dissolution of the platinum salt (Na2PtCl6·6H2O) in water and storage of the solution (referred to as ‘equilibration time’) before adding the remaining reagents and additives (CoCl2 and P-123) are imperative to consistently reproduce the films mesoporosity. Highly mesoporous Pt-rich Co‒Pt films (10–23 at.% Co), with a pore diameter of 10‒17 nm, were obtained from an electrolyte that involved an equilibration time, while mesoporosity was often absent in films grown from a freshly prepared electrolyte (i.e., upon dissolving all chemicals immediately before electrodeposition). The results suggest that pore formation is governed by the complexation dynamics of Pt(IV) in water, which was investigated by UV–vis spectroscopy. Namely, the concentration of hydroxochloroplatinate complexes ([PtCl6-x(OH)x]2–) originating from the exchange of Cl– by OH– ions increase during the equilibration time. [PtCl6-x(OH)x]2– species would interact more favorably with the hydrophilic poly(ethylene oxide) moieities of P-123 micelles than [PtCl6]2–. The distinct interaction between micelles and the complexes of platinum is key for the reproducible generation of a mesoporous network. Our finding highlights the relevant role of electrolyte processing for the control of mesoporosity in metallic systems prepared by micelle-assisted electrodeposition, which we believe can be extended to many electrolytic processes. © 2020 Elsevier Ltd
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.subject
Electrolyte processing
en_US
dc.subject
Electrodeposition
en_US
dc.subject
Mesoporous alloys
en_US
dc.subject
Cobalt-platinum
en_US
dc.subject
Amphiphilic surfactant
en_US
dc.title
The order of addition and time matters: Impact of electrolyte processing on micelle-assisted electrosynthesis of mesoporous alloys
en_US
dc.type
Journal Article
dc.date.published
2020-08-14
ethz.journal.title
Electrochimica Acta
ethz.journal.volume
358
en_US
ethz.journal.abbreviated
Electrochim. acta
ethz.pages.start
136940
en_US
ethz.size
10 p.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02620 - Inst. f. Robotik u. Intelligente Systeme / Inst. Robotics and Intelligent Systems::03627 - Nelson, Bradley J. / Nelson, Bradley J.::08705 - Gruppe Pané Vidal
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02620 - Inst. f. Robotik u. Intelligente Systeme / Inst. Robotics and Intelligent Systems::03627 - Nelson, Bradley J. / Nelson, Bradley J.::08705 - Gruppe Pané Vidal
ethz.date.deposited
2020-09-04T20:18:21Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2020-09-09T14:26:44Z
ethz.rosetta.lastUpdated
2021-02-15T17:06:22Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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