Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
The solid-liquid interface, also known as the electric double layer, is one of the oldest and most fundamental concepts in electrochemistry. However, this interface consists of various elements - such as the electrode, solvent, cation, anion, reactant, product, etc. - and its microscopic structure remains elusive and difficult to understand. - and its microscopic structure remains elusive and difficult to understand. In this study, we demonstrate that an ionomer can selectively control the water properties at the electrode-electrolyte interface using in situ surface-enhanced infrared absorption spectroscopy (SEIRAS), which directly or indirectly affects the electrocatalytic performance. Online inductively coupled plasma mass spectrometry (ICP-MS) and differential electrochemical spectrometry (DEMS) revealed that the modification of water properties due to the introduction of the ionomer layer resulted in superior stability of the carbon-supported catalyst, mitigating carbon corrosion. Overall, we elucidate that interfacial water is a key factor for electrocatalytic performance and propose the introduction of an ionomer layer as an effective method to selectively control it at the solid-liquid interface.
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