Abstract
We present how to use phase-sensitive second-harmonic generation (PS-SHG) to identify the point of zero charge of an electrochemical interface. The electrical double layer plays an essential role in hydrogen and oxygen electrocatalysis. Yet, very little is known about the interfacial electric field. Second-order nonlinear spectroscopy such as SHG can provide interface-specific information. In this contribution, we will show how the SHG phase can reveal information about the interfacial electric field. Our PS-SHG measurement indicates that the SHG response of a platinum-water interface follows the parabolic model. We can use this analysis to obtain the point of zero charge on platinum and discuss the implication of the finding on our fundamental understanding of electrocatalysis.
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