Abstract
Self-supporting Cu9S5@nanoporous copper (Cu9S5@NPC) heterogenous photoelectrodes with controllable morphologies and hierarchical porous structures are synthesized through dealloying and anodization strategy. 3D Cu9S5 nanostructures (nanosheets or nanorods) grown in-situ on the surface of nanoporous copper (NPC) network are affected by the concentration ratio of Na2S and NaOH in the mixed aqueous solutions. It is found that lower Na2S concentration induces the formation of nanosheets. Attributing to the fertile porous channels, self-supporting structures as well as synergistic effect of Cu9S5 and NPC, the Cu9S5@NPC photoelectrodes possess outstanding photoelectrocatalytic (PEC) performance for the degradation of Methylene blue (MB) dye at the bias of 0.5 V under visible irradiation. Moreover, the possible PEC mechanism is further investigated.
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