Abstract
Ammonia has received much attention as a potential energy storage medium and an alternative fuel for vehicles, in addition to its use as a kind of fertilizer.1 Recent studies showed that ammonia could be produced by N2 and H2O through an electrochemical method, with the advantages of zero CO2 emission and energy saving compared with the traditional “Haber-Bosch” process. However, as the theoretical potentials of hydrogen evolution reaction (HER) and nitrogen reduction reaction (NRR) are very close, H2 is the dominant product due to the much fast reaction kinetics of the former. This talk will report the study of NRR in aqueous solutions by detecting reaction intermediates with the powerful surface enhanced infrared absorption spectroscopy (SEIRAS) technique on different metal surfaces, including Au, Pt, Ru and Rh.2-4 Possible reaction pathways based on the spectroscopic and electrochemical results will be derived and discussed.
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