Abstract
A large number of studies on the electrochemical synthesis of ammonia have been published in the past two decades, but very few of them searched for electrochemical promotion phenomena. This is because in most of the studies, pure N2 (instead of N2/H2 mixture) was introduced over the cathode. In the studies on NH3 synthesis, the Faradaic efficiency, Λ, attains very low values, and, in most cases, the phenomenon is “sub-Faradaic,” i.e., Λ < 1. The Λ values are substantially larger when a mixture of N2 and H2, rather than N2 alone, is introduced at the cathode. In the reaction of NH3 decomposition, the picture is improved: in all cases, Λ > 1 and values of the order of 100 have been reported. For either reaction (synthesis or decomposition), the ρ values are comparable to those reported in previous NEMCA studies: a maximum ρ = 220 has been reported, while typical values are between 2 and 10. The NEMCA characteristics in NH3 synthesis were poor primarily because its thermodynamic equilibrium limits the yield and, therefore, electrical energy must be supplied to the system in order to attain the desired conversion.
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Vourros, A., Garagounis, I., Stoukides, M. (2023). Electrochemical Promotion and Related Phenomena During Ammonia Synthesis. In: Vernoux, P., Vayenas, C.G. (eds) Recent Advances in Electrochemical Promotion of Catalysis. Modern Aspects of Electrochemistry, vol 61. Springer, Cham. https://doi.org/10.1007/978-3-031-13893-5_8
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