Noble-Metal Nanorod Cryoaerogels with Electrocatalytically Active Surface Sites

verfasst von
Dániel Zámbó, Pascal Rusch, Franziska Lübkemann, Nadja C. Bigall
Abstract

Noble-metal-based electrocatalysts usually contain small nanoparticle building blocks to ensure a high specific surface area as the scene for the surface processes. Here, we show that relatively large noble-metal nanorods are also promising candidates to build up functional macrostructures with prominent electrocatalytic activity. After optimizing and upscaling the syntheses of gold nanorods and gold bipyramid-templated silver nanorods, cryoaerogels are fabricated on a conductive substrate via flash freezing and subsequent freeze drying. The versatile cryoaerogelation technique allows the formation of macrostructures with dendritic, open-pore structure facilitating the increase of the accessible nanorod surfaces. It is demonstrated via electrochemical oxidation and stripping test experiments that noble-metal surface sites are electrochemically active in redox reactions. Furthermore, gold nanorod cryoaerogels offer a platform for redox sensing, ethanol oxidation reaction, as well as glucose sensing. Compared to their simply drop-cast and dried counterparts, the noble-metal nanorod cryoaerogels offer enhanced activity due to the open porosity of the fabricated nanostructure while maintaining structural stability.

Organisationseinheit(en)
Institut für Physikalische Chemie und Elektrochemie
AG Funktionale Nanostrukturen aus assemblierten kolloidalen Nanopartikeln
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Typ
Artikel
Journal
ACS Applied Materials & Interfaces
Band
13
Seiten
57774–57785
Anzahl der Seiten
12
ISSN
1944-8244
Publikationsdatum
08.12.2021
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Werkstoffwissenschaften (insg.)
Elektronische Version(en)
https://doi.org/10.1021/acsami.1c16424 (Zugang: Offen)