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- W2948512162 abstract "Multimolar CO2 concentrations are achieved in acetonitrile solutions containing supporting electrolyte at relatively mild CO2 pressures (<5 MPa) and ambient temperature. Such CO2 -rich, electrolyte-containing solutions are termed as CO2 -eXpanded Electrolytes (CXEs) because significant volumetric expansion of the liquid phase accompanies CO2 dissolution. Cathodic polarization of a model polycrystalline gold electrode-catalyst in CXE media enhances CO2 to CO conversion rates by up to an order of magnitude compared with those attainable at near-ambient pressures, without loss of selectivity. The observed catalytic process intensification stems primarily from markedly increased CO2 availability. However, a non-monotonic correlation between the dissolved CO2 concentration and catalytic activity is observed, with an optimum occurring at approximately 5 m CO2 concentration. At the highest applied CO2 pressures, catalysis is significantly attenuated despite higher CO2 concentrations and improved mass-transport characteristics, attributed in part to increased solution resistance. These results reveal that pressure-tunable CXE media can significantly intensify CO2 reduction rates over known electrocatalysts by alleviating substrate starvation, with CO2 pressure as a crucial variable for optimizing the efficiency of electrocatalytic CO2 conversion." @default.
- W2948512162 created "2019-06-14" @default.
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- W2948512162 date "2019-08-07" @default.
- W2948512162 modified "2023-10-14" @default.
- W2948512162 title "Intensified Electrocatalytic CO <sub>2</sub> Conversion in Pressure‐Tunable CO <sub>2</sub> ‐Expanded Electrolytes" @default.
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- W2948512162 doi "https://doi.org/10.1002/cssc.201901107" @default.
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