Preparation and Characterization of Model Catalysts for the HCl Oxidation Reaction - Atomically-Precise Methods for Synthesis of Solid Catalysts - page 217

nanostructure and texture. Moreover, also solid solutions with Zr
(Zr 1 x Ce x O 2 ), possessing higher stability than pure CeO 2 , can be structured
on the nanometer scale using sol-gel methods, providing similar morpho-
logical diversity. 133,136
The use of electrospun nanofibers in stability studies is versatile and
not restricted to HCl oxidation as it can easily be extended to other types
of corrosive reactions such as the NH 3 oxidation reaction (Ostwald pro-
cess). In order to gain deeper insights into the underlying microscopic
processes of reaction induced corrosion molecular modeling such as
kinetic Monte Carlo methods or molecular dynamics is required. Trans-
port phenomena have extensively been studied for the Ostwald process
over Rh-stabilized Pt gauzes. 140-142 These semi-empirical models may
serve as a starting point in future studies to comprehend on the mor-
phological changes of Pt and Rh-doped Pt nanowires prepared by
electrospinning.
One of the major problems faced in photocatalysis is photostability. Also,
here, photocatalysis research may benefit from the fibrous morphology of
electrospun model photocatalysts to learn more about the photodegrada-
tion. 143,144 Stability is also a major concern in electrocatalysis such as the
oxygen evolution reaction (OER), 145 oxygen reduction reaction (ORR) 146,147 or
the chlorine evolution reaction (CER). 148 Novel model electrodes can be
prepared from active nanofibers in the form of mats which can then be
beneficially applied for stability investigations.
Electrospun nanofibers can also be used as templates (carrier) which are
further functionalized by impregnation with an active component or other
cofactors. Not only corrosion but also other types of degradation could be
studied by nanofibrous model catalysts such as coking and carbide for-
mation of the catalysts in e.g., the Fischer-Tropsch synthesis.
Therefore we are confident that the use of electrospun nanofibers as
model catalysts is a quite general and versatile approach to study the sta-
bility of catalysts in heterogeneous catalysis, electrocatalysis and photo-
catalysis under typical reaction conditions.

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Acknowledgements
This Deacon project was supported by the German Science council (DFG)
and the federal ministry of science and education (BMBF_Deacon:
033R018C). We acknowledge financial support within the LOEWE program
of excellence of the Federal State of Hassia (project initiative STORE-E). This
project was supported by the Laboratory of Materials Research (LaMa) of the
Justus-Liebig University. All our co-workers in this project are acknowledged
who have contributed to this exciting project: Dr Daniela Crihan, Dr Marcus
Knapp, Dr Stefan Rohrlack, Dr Jan-Philipp Hofmann, Dr Nikolay Tarabanko,
Franziska Hess, Dr Attila Farkas, Sven Urban, Katarzyna Zalewska, Dr Ari
Seitsonen, and Dr Rainer Ostermann.