Photoelectrochemical CO reduction reaction (PEC-CO2RR) into multicarbon (C and C) products is one of the most favorable paths for converting and utilizing atmospheric CO. Although Cu-based photocathodes have unique features that can convert CO into value-added products, they have limited selectivity. In this study, we established the Cu-based heterostructure by introducing the CuO (111) phase on the surface of Cu/Cu(OH) nanorods array (CNA) while integrating Pd cocatalyst to improve the selectivity of the C products via PEC-CO2RR.
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