Fig. 5: Long-term AOR stability test of the as-prepared CuO/CF.

a, d Chronoamperometric curves recorded in N2-purged 1 M KOH with and without 1 M EtOH or MeOH at 1.82 V vs. RHE for 10000 s. b, e Chronoamperometric cyclic stability test of the as-prepared CuO/CF for two consecutive cycles at 1.82 V vs. RHE in N2-purged 1 M KOH with 1 M EtOH or MeOH. c, f Chronoamperometry test for 3 h at different potentials in N2-purged 1 M KOH containing 1 M EtOH or MeOH.