“…Acetaldehyde is the main reduction product at all conditions, which is in agreement with previous studies of gasphase CO 2 electroreduction. [18][19][20] At the potential of -1.4 V vs CE, the total FE for all products is about 10 %, while ~25 nmol•cm -2 •h -1 acetaldehyde is formed with a FE of around 6 %. •h -1 with a catalyst loading of 0.5 mg•cm -2 ) at a higher temperature and penitential (90 o C, -2.75 V, -1.6 mA•cm -2 ), the FE of acetaldehyde is only 1 %.…”