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Open Access Publications from the University of California

Tailoring Copper Nanocrystals towards C2Products in Electrochemical CO2Reduction

  • Author(s): Loiudice, A
  • Lobaccaro, P
  • Kamali, EA
  • Thao, T
  • Huang, BH
  • Ager, JW
  • Buonsanti, R
  • et al.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Favoring the CO2reduction reaction (CO2RR) over the hydrogen evolution reaction and controlling the selectivity towards multicarbon products are currently major scientific challenges in sustainable energy research. It is known that the morphology of the catalyst can modulate catalytic activity and selectivity, yet this remains a relatively underexplored area in electrochemical CO2reduction. Here, we exploit the material tunability afforded by colloidal chemistry to establish unambiguous structure/property relations between Cu nanocrystals and their behavior as electrocatalysts for CO2reduction. Our study reveals a non-monotonic size-dependence of the selectivity in cube-shaped copper nanocrystals. Among 24 nm, 44 nm and 63 nm cubes tested, the cubes with 44 nm edge length exhibited the highest selectivity towards CO2RR (80 %) and faradaic efficiency for ethylene (41 %). Statistical analysis of the surface atom density suggests the key role played by edge sites in CO2RR.

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