Abstract
This work discusses a relatively simple method for time resolved detection of electrochemical effects using surface plasmon resonance (SPR) under potentiodynamic conditions. A previously noted phenomenological framework for measuring SPR shifts at a fixed angle is quantified and developed in detail. The SPR experiments are performed with a collimated laser beam at a fixed wavelength using the Kretschmann configuration. The instrument uses a commonly available fast photodiode for signal detection, and has an angular resolution of 10 −3 deg. As a model electrochemical system, we use a chromium-supported gold film, controlled by cyclic voltammetry in an aqueous electrolyte of 0.1 M NaNO 3. The transient SPR response of the electrode to voltage variations contains features of certain interfacial effects that cannot be detected using electrochemical measurements alone. This SPR technique is suitable for studying both faradaic and nonfardaic reactions.
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