Chapter 7 - Electrocatalytic Reactions on Platinum Electrodes Studied by Dynamic Surface-Enhanced Infrared Absorption Spectroscopy (SEIRAS)

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This chapter explains the electrocatalytic reactions on platinum electrodes studied by dynamic surface-enhanced infrared absorption spectroscopy (SEIRAS). Conventional electrochemical methods provide a vast amount of mechanistic information for heterogeneous redox processes. External and internal reflection modes are available for the in-situ infrared (IR) reflection monitoring of the electrochemical interface. The concentration of reactant is considerably reduced and products are accumulated in the thin layer during spectral measurements. The IR radiation usually probes both the center and edge of the surface. Absorption by the molecules adsorbed on the surface is significantly enhanced by the surface-enhanced infrared absorption (SEIRA) effect. The SEIRA effect can be observed in transmission and external reflection modes. SEIRA is similar to surface-enhanced Raman scattering (SERS) in nature. Both SEIRA and SERS are characterized by a remarkable enhancement of the signals from adsorbed molecules on rough metal surfaces.

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