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

Allgemeine Materialwissenschaften

Elektronische Version(en)

https://doi.org/10.1021/acsami.1c16424 (Zugang: Offen)