The Quest of Electropromoted Nano-dispersed Catalysts

A Fellah Jahromi, C Panaritis, EA Baranova - Recent Advances in …, 2022 - Springer
Recent Advances in Electrochemical Promotion of Catalysis, 2022Springer
Electrochemical promotion of catalysis (EPOC) also known as non-Faradaic electrochemical
modification of catalytic activity (NEMCA) phenomenon of nano-dispersed catalytic systems
has been of paramount interest since the pioneering studies of Vayenas and co-workers in
the 1980s. A typical heterogeneous catalyst consists of a nano-sized active phase dispersed
on high-surface-area support. This allows decreasing the noble metal catalyst loading while
considerably increasing the number of surface-active sites available for the reaction. In …
Abstract
Electrochemical promotion of catalysis (EPOC) also known as non-Faradaic electrochemical modification of catalytic activity (NEMCA) phenomenon of nano-dispersed catalytic systems has been of paramount interest since the pioneering studies of Vayenas and co-workers in the 1980s. A typical heterogeneous catalyst consists of a nano-sized active phase dispersed on high-surface-area support. This allows decreasing the noble metal catalyst loading while considerably increasing the number of surface-active sites available for the reaction. In EPOC studies the catalyst-working electrode is often fabricated as a continuous, porous film with low dispersion; however, more and more works on the fabrication and study of EPOC with nanostructured, dispersed catalysts have emerged recently. This chapter presents a review of EPOC studies with nano-sized, electropromoted catalytic systems reported in the last decade. The first section discusses the origin of EPOC, the main parameters, and the rules. The second part provides the observation of the EPOC effect for both noble and non-noble nanoparticle catalysts. The third part examines recent advances in density functional theory (DFT) for the understanding of electrified interfaces in catalysis, followed by recent advances in self-sustained EPOC. Finally, the last section highlights the research gaps in understanding and applying electrochemically promoted nanostructured catalysts to technologically important processes.
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