Ultra-pure nanoporous gold films for electrocatalysis

• Verfasst von: Kwon, Hyunah [VerfasserIn]
• Verfasst von: Barad, Hannah-Noa [VerfasserIn]
• Verfasst von: Silva Olaya, Alex Ricardo [VerfasserIn]
• Verfasst von: Alarcón Correa, Mariana [VerfasserIn]
• Verfasst von: Hahn, Kersten [VerfasserIn]
• Verfasst von: Richter, Gunther [VerfasserIn]
• Verfasst von: Wittstock, Gunther [VerfasserIn]
• Verfasst von: Fischer, Peer [VerfasserIn]
• Titel: Ultra-pure nanoporous gold films for electrocatalysis
• Verf.angabe: Hyunah Kwon, Hannah-Noa Barad, Alex Ricardo Silva Olaya, Mariana Alarcón-Correa, Kersten Hahn, Gunther Richter, Gunther Wittstock, and Peer Fischer
• E-Jahr: 2023
• Jahr: 21 August 2023
• Umfang: 10 S.
• Fussnoten: Gesehen am 02.10.2023
• Titel Quelle: Enthalten in: American Chemical SocietyACS catalysis
• Ort Quelle: Washington, DC : ACS, 2011
• Jahr Quelle: 2023
• Band/Heft Quelle: 13(2023), 17, Seite 11656-11665
• ISSN Quelle: 2155-5435
• DOI: doi:10.1021/acscatal.3c02225
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1860621007

Abstract

Nanoporous gold (Au) films are self-supported structures that possess a large surface area and extraordinary catalytic activity. Generally, nanoporous gold is obtained by solution-based dealloying where the less noble metal, often silver (Ag), is etched out. However, the residual amounts of the sacrificial metal are not well controlled, the impure samples show restructuring, and the residual metal prevents the study of the catalytic role of Au alone. Here, we fabricate impurity-free nanoporous gold films by a plasma-enabled dry synthetic route. The scheme does not include sacrificial metals or solution processing and is much more general. It is used to obtain self-supported ultra-pure nanoporous gold films with controllable pore sizes. The impurity-free nanoporous gold films possess highly curved ligaments, are remarkably robust, and stable over hundreds of electrochemical cycles. Furthermore, they contain many catalytically active sites, which is highly promising for electrocatalytic applications.