Catalyst-electrolyte Interactions in Aqueous Reline Solutions for Highly Selective Electrochemical CO2 Reduction
Article
Article Title | Catalyst-electrolyte Interactions in Aqueous Reline Solutions for Highly Selective Electrochemical CO2 Reduction |
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ERA Journal ID | 1615 |
Article Category | Article |
Authors | Garg, Sahil (Author), Li, Mengran (Author), Rufford, Thomas E. (Author), Ge, Lei (Author), Rudolph, Victor (Author), Knibbe, Ruth (Author), Konarova, Muxina (Author) and Wang, Geoff G.X. (Author) |
Journal Title | ChemSusChem: chemistry and sustainability, energy and materials |
Journal Citation | 13 (2), pp. 304-311 |
Number of Pages | 8 |
Year | 2020 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 1864-5631 |
1864-564X | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/cssc.201902433 |
Web Address (URL) | https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cssc.201902433 |
Abstract | Achieving high product selectivities is one challenge that limits viability of electrochemical CO2 reduction (CO2R) to chemical feedstocks. Here, it was demonstrated how interactions between Ag foil cathodes and reline (choline chloride + urea) led to highly selective CO2R to CO with a faradaic efficiency of (96±8) % in 50 wt % aqueous reline at −0.884 V vs. the reversible hydrogen electrode (RHE), which is a 1.5‐fold improvement over CO2R in KHCO3. In reline the Ag foil was roughened by (i) dissolution of oxide layers followed by (ii) electrodeposition of Ag nanoparticles back on cathode. This surface restructuring exposed low‐coordinated Ag atoms, and subsequent adsorption of choline ions and urea at the catalyst surface limited proton availability in the double layer and stabilized key intermediates such as *COOH. These approaches could potentially be extended to other electrocatalytic metals and lower‐viscosity deep eutectic solvents to achieve higher‐current‐density CO2R in continuous‐flow cell electrolyzers. |
Keywords | catalyst–electrolyte interactions; CO2 reduction; electrochemistry; reline; silver |
ANZSRC Field of Research 2020 | 340211. Transition metal chemistry |
400408. Reaction engineering (excl. nuclear reactions) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5938/catalyst-electrolyte-interactions-in-aqueous-reline-solutions-for-highly-selective-electrochemical-co2-reduction
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