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One of the Recent Discoveries in Catalysis: The Phenomenon of Electrochemical Promotion (pp.99-132) $100.00
Authors:  (Carmen Jiménez Borja, Antonio de Lucas Consuegra, Jose Luis Valverde, Fernando Dorado, Ángel Caravaca, Jesús González Cobos, Departamento de Ingeniería Química, Universidad de Castilla-La Mancha (UCLM), Ciudad Real, Spain)
Abstract:
In the early 80‘s Stoukides and Vayenas discovered and studied a new phenomenon, called Electrochemical Promotion of Catalysis (EPOC), that in the last decades has had a strong impact in the fields of electrochemistry, heterogeneous catalysis and surface science. It has been recognized as one of the most recent exciting discoveries with great impact on several catalytic and electrocatalytic processes.
The EPOC phenomenon is an important electrochemical tool for controlling the catalytic activity and selectivity of a heterogeneous catalyst interfaced with a solid electrolyte via external electrical current or potential application. As a result, electrochemically induced catalytic rate increase up to 200 times larger than the catalytic rate without polarization have been found. Furthermore, the rate increase has been found to be typically 10 to 105 times larger than the electrochemical rate of ion supply from the solid electrolyte to the catalyst-electrode given by the Faraday‘s law. Accordingly, this phenomenon was also termed as non-Faradaic electrochemical modification of catalytic activity (NEMCA effect).
Since its discovery, several research efforts have been carried out leading to a thorough understanding of the phenomenon which has been applied to more than a hundred catalytic systems including both environmental and energy-related applications. So far the most important achievement in the EPOC field has been the understanding of its origin and mechanism and its contribution to further clarify the effect of electronic promoters in heterogeneous catalysis. The latest progress has been impressive pointing out the technological researches in terms of catalyst-electrodes development and reactor-systems engineering for the industrial point of view.
This chapter will present some key aspects of the phenomenon of electrochemical promotion such as its origin, mechanism and some experimental details. Also, the history and the evolution of the study of the phenomenon will be commented. In addition, some recent applications of this phenomenon to environmental and energetic reactions will be presented, which have been carried out by our group in the Department of Chemical Engineering at University of Castilla-La Mancha (Spain). Finally, the main aims and future trends of EPOC research will be presented. 


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One of the Recent Discoveries in Catalysis: The Phenomenon of Electrochemical Promotion (pp.99-132)