CO2 Electroreduction to Hydrocarbon Fuels on Carbon-Supported Copper Nanoparticles: Particle Size Effect
Here we report particle size effect for CO2 electroreduction to hydrocarbon fuels on Vulcan Carbon (VC)-supported Cu nanoparticles. Cu nanoparticles of 5, 12 and 27 nm diameter on carbon supports were synthesized by the reduction of Cu(acac)2 in a mixture of oleylamine and hexane by LiBEt3H .
X-Ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) were used for nanoparticles ex-situ analysis. Pb underpotential deposition was used for in-situ evaluation of the electrochemical surface area (ECSA) of Cu nanoparticles .
The activity of the Cu nanoparticles towards CO2 electroreduction to hydrocarbon fuels was evaluated using a sealed RDE setup connected to a GC. Thin films of three Cu/VC catalysts were deposited on the surface of custom-made 7 mm glassy carbon disks (Pine Instruments, Inc), following a well-established in the PEMFC community protocol . GC sampling from the electrochemical cell was performed at 5, 25, 45 and 65 min from the beginning of each experiment, while holding the electrode potential at -1.2, -1.4, -1.6, -1.8, -2 and -2.2 V vs. Ag/AgCl reference electrode.
Our preliminary results show that the ratio of C2H4 to CH4 increases with a decrease in the Cu particle size.
This presentation will discuss different aspects of CO2 electroreduction reaction on Cu nanoparticles.
OAB is grateful to the Office of Naval Research for financial support of this project.
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