Details
| Original language | English |
|---|---|
| Pages (from-to) | 57774–57785 |
| Number of pages | 12 |
| Journal | ACS Applied Materials & Interfaces |
| Volume | 13 |
| Issue number | 48 |
| Early online date | 23 Nov 2021 |
| Publication status | Published - 8 Dec 2021 |
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.
Keywords
- assembly, cryoaerogel coatings, electrocatalysis, gold nanorods, silver nanorods
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
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In: ACS Applied Materials & Interfaces, Vol. 13, No. 48, 08.12.2021, p. 57774–57785.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Noble-Metal Nanorod Cryoaerogels with Electrocatalytically Active Surface Sites
AU - Zámbó, Dániel
AU - Rusch, Pascal
AU - Lübkemann, Franziska
AU - Bigall, Nadja C.
N1 - Funding Information: The authors thank the financial support of the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement 714429). In addition, this work was funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under Germany’s excellence strategy within the cluster of excellence PhoenixD (EXC 2122, project ID 390833453) and the grant BI 1708/4-1. The authors moreover thank the Laboratory of Nano and Quantum Engineering (LNQE) and Prof. Armin Feldhoff for providing the TEM facility.
PY - 2021/12/8
Y1 - 2021/12/8
N2 - 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.
AB - 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.
KW - assembly
KW - cryoaerogel coatings
KW - electrocatalysis
KW - gold nanorods
KW - silver nanorods
UR - http://www.scopus.com/inward/record.url?scp=85120412266&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c16424
DO - 10.1021/acsami.1c16424
M3 - Article
VL - 13
SP - 57774
EP - 57785
JO - ACS Applied Materials & Interfaces
JF - ACS Applied Materials & Interfaces
SN - 1944-8244
IS - 48
ER -