 Amorphous metal catalysts often exhibit appealing catalytic properties, however, accurate control synthesis of amorphous nanometal catalysts is a challenge. Here, the authors report a feasible strategy to prepare the amorphous CU catalysts by supercritical CO2 treatment followed by electro-reduction. The resulted catalyst shows high selectivity towards multicarbon products for CO2 electro-reduction. This article was authored by Chen Zhenchen, Shupinyang, Yahuai Wu, and others.