Journal
NANO LETTERS
Volume 19, Issue 12, Pages 8461-8468Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b02748
Keywords
CO2 reduction; copper electrocatalysts; shape; gas diffusion electrode; ethylene
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Funding
- National Science Foundation [CHE-1437396, CBET-1803482]
- Johns Hopkins University
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Electroreduction of CO2 represents a promising solution for addressing the global challenges in energy and sustainability. This reaction is highly sensitive to the surface structure of electrocatalysts and the local electrochemical environment. We have investigated the effect of Cu nanoparticle shape on the electrocatalysis of CO2 reduction by using gas diffusion electrodes (GDEs) and flowing alkaline catholytes. Cu nanocubes of similar to 70 nm in edge length are synthesized with {100} facets preferentially exposed on the surface. They are demonstrated to possess substantially enhanced catalytic activity and selectivity for CO2 reduction, compared to Cu nanospheres of similar particle sizes. The electrocatalytic performance was further found to be dependent on the concentration of electrolyte (KOH). The Cu nanocubes reach a Faradaic efficiency of 60% and a partial current density of 144 mA/cm(2) toward ethylene (C2H4) production, with the catalytic enhancement being attributable to a combination of surface structure and electrolyte alkalinity effects.
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