Journal
CHEMSUSCHEM
Volume 10, Issue 22, Pages 4642-4649Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701179
Keywords
areal particle density; carbon dioxide; copper oxide; electroreduction; ethylene
Funding
- Bundesministerium fur Bildung und Forschung (BMBF) [03SF0523A]
- German Research Foundation (DFG) [STR 596/8-1]
- China Scholarship Council (CSC)
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A key challenge of the carbon dioxide electroreduction (CO2RR) on Cu-based nanoparticles is its low faradic selectivity toward higher-value products such as ethylene. Here, we demonstrate a facile method for tuning the hydrocarbon selectivities on CuOx nanoparticle ensembles by varying the nanoparticle areal density. The sensitive dependence of the experimental ethylene selectivity on catalyst particle areal density is attributed to a diffusional interparticle coupling that controls the de- and re-adsorption of CO and thus the effective coverage of COad intermediates. Thus, higher areal density constitutes dynamically favored conditions for CO re-adsorption and *CO dimerization leading to ethylene formation independent of pH and applied overpotential.
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