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Particle Size Effects in the Catalytic Electroreduction of CO2 on Cu Nanoparticles

Open access
Reske, Rulle, Mistry, Hemma, Behafarid, Farzad, Roldan Cuenya, Beatriz, Strasser, Peter·2014·Journal of the American Chemical Society

Abstract

A study of particle size effects during the catalytic CO2 electroreduction on size-controlled Cu nanoparticles (NPs) is presented. Cu NP catalysts in the 2-15 nm mean size range were prepared, and their catalytic activity and selectivity during CO2 electroreduction were analyzed and compared to a bulk Cu electrode. A dramatic increase in the catalytic activity and selectivity for H2 and CO was observed with decreasing Cu particle size, in particular, for NPs below 5 nm. Hydrocarbon (methane and ethylene) selectivity was increasingly suppressed for nanoscale Cu surfaces. The size dependence of the surface atomic coordination of model spherical Cu particles was used to rationalize the experimental results. Changes in the population of low-coordinated surface sites and their stronger chemisorption were linked to surging H2 and CO selectivities, higher catalytic activity, and smaller hydrocarbon selectivity. The presented activity-selectivity-size relations provide novel insights in the CO2 electroreduction reaction on nanoscale surfaces. Our smallest nanoparticles (~2 nm) enter the ab initio computationally accessible size regime, and therefore, the results obtained lend themselves well to density functional theory (DFT) evaluation and reaction mechanism verification.

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Crossref · 10.1021/ja500328k

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Metadata

Authors
Reske, R., Mistry, H., Behafarid, F., Roldan Cuenya, B., & Strasser, P.
Venue
Journal of the American Chemical Society
Published
2014-05-06
Volume
136
Issue
19
Pages
6978-6986
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2326170978
Cited by
1,434
References
8
FWCI
23.90
Type
journal article
Language
en
Open access
green

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