Program. The authors wish to thank Mr. Andreas Papanicolaou and Mr. Michael H. Wilson for their help with the experiments.

No abstract

High faradaic effieiencies and current densities for the electrochemical reduction of CO2 to both CH4 and C2H4 are reported at in situ deposited copper on glassy carbon electrodes in aqueous 0.5M KHCO3. At 8.3 mA/cm 2 the cumulative yield for CH4 and C2H4 can be essentially faradaic. At 25 mA/cm 2 the overall efficiency for these two products was 79%. The proposed CO2 reduction mechanism does not appear to involve the direct electrochemical reduction of CO2, but proceeds through the reaction of weakly adsorbed CQ with electrochemically generated chemisorbed hydrogen at the copper surface. Subsequent reduction of this reduced species probably leads to bridged CO groups which can be desorbed to give either carbon monoxide or reduced further to give CH4 and C2H4. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.123.35.41 Downloaded on 2014-09-12 to IP Vol. 135, No. 6

Electrochemical reduction of COb under ambient conditions to methanol, ethanol, and n-propanol is reported at perovskite-type A~.sA~.2CuO4 (A = La, Pr, and Gd; A' = Sr and Th) electrocatalysts when incorporated into gas diffusion electrodes. In the absence of copper at the perovskite B lattice site, no activity was found. This investigation resulted in the identification of electrochemical conditions whereby perovskite-type electrocatalysts could achieve cumulative Faradaic efficiencies for CO2 reduction to methanol, ethanol, and n-propanol up to =40% at current densities of 180 mA/cm 2.

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