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Catalyst Particle Density Controls Hydrocarbon Product Selectivity in CO2 Electroreduction on CuOx
Xingli Wang1, Ana Sofia Varela1,2, Arno Bergmann1
1The Electrochemical Energy, Catalysis, and Materials Science Laboratory, Department of Chemistry, Chemical Engineering Division, Technical University Berlin, 10623, Berlin, Germany.
Optimizing copper oxide nanoparticle density enhances selectivity for ethylene production via carbon dioxide electroreduction. Higher densities promote CO dimerization, a key step for ethylene formation.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Copper-based nanoparticles are crucial for CO2 electroreduction (CO2RR).
- Achieving high selectivity for valuable products like ethylene remains a significant challenge.
- Current methods often struggle with controlling product distribution.
Purpose of the Study:
- To investigate the effect of nanoparticle areal density on CO2RR selectivity.
- To tune hydrocarbon selectivities on copper oxide (CuOx) nanoparticle ensembles.
- To understand the mechanism controlling ethylene formation.
Main Methods:
- Fabrication of CuOx nanoparticle ensembles with varying areal densities.
- Electrochemical characterization of CO2RR performance.
- Analysis of reaction intermediates and surface species.
Main Results:
- Ethylene selectivity is highly sensitive to nanoparticle areal density.
- Higher areal densities promote interparticle coupling via CO diffusion.
- This coupling facilitates CO re-adsorption and CO dimerization, leading to ethylene.
Conclusions:
- Nanoparticle areal density is a critical parameter for controlling CO2RR product selectivity.
- Diffusional interparticle coupling is key to enhancing ethylene formation.
- This strategy offers a pH and overpotential-independent route to ethylene.
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