Video Experimental Relacionado

Updated: Feb 27, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Competencia de Adsorbatos Interfaciales Regula la Estabilización de Intermediarios y el Potencial de Inicio en la

Adrián Pinilla-Sánchez¹, Suraj Panja^2,3, Bárbara Polesso¹

¹ICFO - Institut de Ciències Fotòniques, the Barcelona Institute of Science and Technology, Castelldefels Barcelona 08860, Spain.

Journal of the American Chemical Society

|February 26, 2026

Abstract:

Electrochemical CO₂ reduction (CO₂R) in acid may enable high carbon utilization but faces selectivity challenges, particularly from the Hydrogen Evolution Reaction (HER). While the source of protons and cation concentrations play a role in this balance, the role of anions remains underexplored. Here, we combine in situ surface-enhanced Raman Spectroscopy during CO₂R in acid with theoretical simulations to investigate the role of anionic species over copper gas diffusion electrodes at application-relevant current densities (up to 0.2 A·cm^-2) and performance. Our observations reveal that sulfate adsorption inhibits CO₂R at low pH and delays CO₂R intermediate formation, which is enabled by hydroxyl species coadsorption. Such competition regulates *CO stabilization and the balanced *CO coverage needed to favor the formation of multicarbon products. These results shed light on how anion interactions govern CO₂R selectivity under acidic conditions and their impact on overpotentials, offering guidance on catalyst-electrolyte interface design.

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