Cryoaerogels and Cryohydrogels as Efficient Electrocatalysts

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OriginalspracheEnglisch
Aufsatznummer2007908
FachzeitschriftSMALL
Jahrgang17
Ausgabenummer18
Frühes Online-Datum21 März 2021
PublikationsstatusVeröffentlicht - 6 Mai 2021

Abstract

Additive-free cryoaerogel coatings from noble metal nanoparticles are prepared and electrochemically investigated. By using liquid nitrogen or isopentane as cooling medium, two different superstructures are created for each type of noble metal nanoparticle. These materials (made from the same amount of particles) have superior morphological and catalytic properties as compared to simply immobilized, densely packed nanoparticles. The morphology of all materials is investigated with scanning electron microscopy (SEM). Electrochemically active surface areas (ECSAs) are calculated from cyclic voltammetry measurements. The catalytic activity is studied for the ethanol oxidation reaction (EOR). Both are found to be increased for superstructured materials prepared by cryoaerogelation. Furthermore, cryoaerogels with cellular to dendritic structure that arise from freezing with isopentane show the best catalytic performance and highest ECSA. Moreover, as a new class of materials, cryohydrogels are created for the first time by thawing flash-frozen nanoparticle solutions. Structure and morphology of these materials match with the corresponding types of cryoaerogels and are confirmed via SEM. Even the catalytic activity in EOR is in accordance with the results from cryoaerogel coatings. As a proof of concept, this approach offers a novel platform towards the easier and faster production of cryogelated materials for wet-chemical applications.

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Cryoaerogels and Cryohydrogels as Efficient Electrocatalysts. / Müller, Dennis; Zámbó, Dániel; Dorfs, Dirk et al.
in: SMALL, Jahrgang 17, Nr. 18, 2007908, 06.05.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Müller D, Zámbó D, Dorfs D, Bigall NC. Cryoaerogels and Cryohydrogels as Efficient Electrocatalysts. SMALL. 2021 Mai 6;17(18):2007908. Epub 2021 Mär 21. doi: 10.1002/smll.202007908
Müller, Dennis ; Zámbó, Dániel ; Dorfs, Dirk et al. / Cryoaerogels and Cryohydrogels as Efficient Electrocatalysts. in: SMALL. 2021 ; Jahrgang 17, Nr. 18.
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abstract = "Additive-free cryoaerogel coatings from noble metal nanoparticles are prepared and electrochemically investigated. By using liquid nitrogen or isopentane as cooling medium, two different superstructures are created for each type of noble metal nanoparticle. These materials (made from the same amount of particles) have superior morphological and catalytic properties as compared to simply immobilized, densely packed nanoparticles. The morphology of all materials is investigated with scanning electron microscopy (SEM). Electrochemically active surface areas (ECSAs) are calculated from cyclic voltammetry measurements. The catalytic activity is studied for the ethanol oxidation reaction (EOR). Both are found to be increased for superstructured materials prepared by cryoaerogelation. Furthermore, cryoaerogels with cellular to dendritic structure that arise from freezing with isopentane show the best catalytic performance and highest ECSA. Moreover, as a new class of materials, cryohydrogels are created for the first time by thawing flash-frozen nanoparticle solutions. Structure and morphology of these materials match with the corresponding types of cryoaerogels and are confirmed via SEM. Even the catalytic activity in EOR is in accordance with the results from cryoaerogel coatings. As a proof of concept, this approach offers a novel platform towards the easier and faster production of cryogelated materials for wet-chemical applications.",
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author = "Dennis M{\"u}ller and D{\'a}niel Z{\'a}mb{\'o} and Dirk Dorfs and Bigall, {Nadja C.}",
note = "Funding Information: The project has in parts been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). The authors also would like to acknowledge the DFG (grant agreement BI 1708/4-1 & DO 1580/5-1), the European Research Council (European Union's Horizon 2020 research and innovation program, grant agreement 714429), and the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur (support code 03X5525) for financial support. D.M. is thankful for financial support from the Hannover School for Nanotechnology (hsn) and the Graduiertenakademie of the Leibniz Universit?t Hannover. The authors moreover thank Armin Feldhoff and J?rgen Caro for providing the SEM facility as well as the Institute for Inorganic Chemistry for providing the ICP-OES facility. Open access funding enabled and organized by Projekt DEAL. ",
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T1 - Cryoaerogels and Cryohydrogels as Efficient Electrocatalysts

AU - Müller, Dennis

AU - Zámbó, Dániel

AU - Dorfs, Dirk

AU - Bigall, Nadja C.

N1 - Funding Information: The project has in parts been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). The authors also would like to acknowledge the DFG (grant agreement BI 1708/4-1 & DO 1580/5-1), the European Research Council (European Union's Horizon 2020 research and innovation program, grant agreement 714429), and the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur (support code 03X5525) for financial support. D.M. is thankful for financial support from the Hannover School for Nanotechnology (hsn) and the Graduiertenakademie of the Leibniz Universit?t Hannover. The authors moreover thank Armin Feldhoff and J?rgen Caro for providing the SEM facility as well as the Institute for Inorganic Chemistry for providing the ICP-OES facility. Open access funding enabled and organized by Projekt DEAL.

PY - 2021/5/6

Y1 - 2021/5/6

N2 - Additive-free cryoaerogel coatings from noble metal nanoparticles are prepared and electrochemically investigated. By using liquid nitrogen or isopentane as cooling medium, two different superstructures are created for each type of noble metal nanoparticle. These materials (made from the same amount of particles) have superior morphological and catalytic properties as compared to simply immobilized, densely packed nanoparticles. The morphology of all materials is investigated with scanning electron microscopy (SEM). Electrochemically active surface areas (ECSAs) are calculated from cyclic voltammetry measurements. The catalytic activity is studied for the ethanol oxidation reaction (EOR). Both are found to be increased for superstructured materials prepared by cryoaerogelation. Furthermore, cryoaerogels with cellular to dendritic structure that arise from freezing with isopentane show the best catalytic performance and highest ECSA. Moreover, as a new class of materials, cryohydrogels are created for the first time by thawing flash-frozen nanoparticle solutions. Structure and morphology of these materials match with the corresponding types of cryoaerogels and are confirmed via SEM. Even the catalytic activity in EOR is in accordance with the results from cryoaerogel coatings. As a proof of concept, this approach offers a novel platform towards the easier and faster production of cryogelated materials for wet-chemical applications.

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