Journal
INORGANIC CHEMISTRY COMMUNICATIONS
Volume 158, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.inoche.2023.111541
Keywords
Cu2O/TiO2 composites; Methanol photoreforming; Copper oxide reduction; Simulated solar light
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Noble metal-free CuXO/TiO2 composites show enhanced photocatalytic activity for H2 production. Surface modification of TiO2 with Cu species promotes effective separation of photogenerated carriers and facilitates the photoreduction of protons and photooxidation of methanol.
Using noble metal-free catalysts is highly promising for sunlight-driven photocatalytic H2 production. Copper compounds have gained considerable interest in this regard. Cu2O/semiconductor composites exhibit superior photocatalytic activity compared to individual compounds. This study focuses on different CuXO/TiO2 composites synthesized via chemical reduction, using Cu2O weight ratios ranging from 1 to 0.05 concerning the TiO2 source. Characterization techniques were employed, including XRD, SEM, XPS, UV-Vis DRS, PL, and TRMC. Surface modification of TiO2 with Cu species (CuO, Cu2O, and Cu0) was observed during the photocatalytic reforming of methanol under simulated solar light. By loading small amounts of CuXO (0.05-0.1%) on TiO2, the highest H2 production and methanol mineralization were achieved, along with the formation of metallic copper. The coexistence of the Cu species and TiO2 facilitated the effective separation of photogenerated electrons and holes, promoting the photoreduction of protons and photooxidation of methanol, respectively.
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