Article ID Journal Published Year Pages File Type
1298102 Solid State Ionics 2013 5 Pages PDF
Abstract

In the past three decades, more than 70 catalytic systems have been reported to exhibit the NEMCA phenomenon (Non-Faradaic Electrochemical Modification of Catalytic Activity). NEMCA has been observed in O2 −, Na+, K+, Pb2 + and H+ conductors. As opposed to catalytic oxidations, however, in which dramatic increases in catalytic reaction rates have been observed, hydrogenation reactions exhibited weak NEMCA characteristics. The maximum Faradaic Efficiency (Λ) that can be obtained in a reaction with limited equilibrium conversion was calculated using a thermodynamic analysis. The values of Λ predicted by the present analysis are compared to those obtained experimentally during the reaction of NH3 synthesis in a H+ cell.

► NEMCA in equilibrium limited reactions. ► Faradaic Efficiency (Λ) can exceed unity. ► Theoretical vs experimental results during NH3 synthesis.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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