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We have recently reported I the electrochem-ical reduction of CO 2 to CH 4 using cold-rolled B370 Cu cathodes (99.9%) in CO 2 saturated 0.SM KHCO 3, at high current densities (up to 38 mA/cm 2) where Faradaic efficiencies of 33 % were observed. Other workers 2 using higher purity Cu (99.999%) cathodes, at lower current densi-ties (up to 10mA/cm 2) found Faradaic efficien-cies up to 65 % for CH 4 formation (at 0 ~ with 1-2 % ethylene being simultaneously produced. Furthermore, the yield for ethyl~ne was found to deteriorate by zl/3 when 99.99 % pure Cu was substituted for the cathode. These closely related observations imply that Cu purity and morphology will be crucial for promoting high
Cook et al. (Tue,) studied this question.