Cryogels from Pt/γ-Fe₂O₃ and Pd/γ-Fe₂O₃ NPs as Promising Electrocatalysts for Ethanol Oxidation Reaction

verfasst von

Hadir Borg, Irene Morales, Daniel Kranz, Nadja C. Bigall, Dirk Dorfs

Abstract

Cryogels from noble metal NPs have proven to be highly efficient catalysts due to their high specific surface area which increases the mass transfer channels and catalytic active sites. By using metal oxides as co-catalysts, the costs of the material can be significantly reduced, while the catalytic activity can remain the same or even improve due to synergetic effects. In this work, we synthesize different cryogel thin films supported on modified ITO substrates from Pt, Pd nanoparticles (NPs), and mixtures of these noble metals with γ-Fe₂O₃ NPs in a very low concentration (1 wt% of the noble metal). Structural and elemental analysis of the samples are performed, along with the measurement and analysis of their catalytic activity. The electrocatalytic activity of the cryogels towards ethanol oxidation reaction (EOR) in alkaline media was evaluated by means of cyclic voltammetry. By mixing γ-Fe₂O₃ NPs with Pt or Pd NPs in the cryogel structure, we observe increased tolerance against poisonous surface intermediates produced during the EOR. Moreover, we observe an increase in the catalytic activity towards EOR in the case of the 1 wt% Pd/γ-Fe₂O₃ cryogel, making them promising materials for the development of direct ethanol fuel cells.

Organisationseinheit(en)

Institut für Physikalische Chemie und Elektrochemie
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Laboratorium für Nano- und Quantenengineering

Externe Organisation(en)

Delta University

Typ

Artikel

Journal

CATALYSTS

Band

13

ISSN

2073-4344

Publikationsdatum

06.07.2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Katalyse, Umweltwissenschaften (insg.), Physikalische und Theoretische Chemie

Elektronische Version(en)

https://doi.org/10.3390/catal13071074 (Zugang: Offen)