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Hydrogen Generation of Cu2O Nanoparticles/MnO–MnO2 Nanorods Heterojunction Supported on Sonochemical-Assisted Synthesized Few-Layer Graphene in Water-Splitting Photocathode

Su, Yen-Hsun, Huang, Shi-Hong, Kung, Po-Yen, Shen, Tin-Wei, Wang, Wen-Lin
ACS sustainable chemistry 2015 v.3 no.9 pp. 1965-1973
cathodes, cuprous oxide, energy, graphene, hydrogen, hydrogen ions, hydrogen production, manganese, manganese dioxide, nanoparticles, nanorods, photochemistry, photosensitizing agents, photovoltaic cells, transportation
In this study, we investigated the production of hydrogen by photochemical water splitting. A multi-shaped Cu₂O nanoparticles/MnO–MnO₂ nanorods heterojunction on a few-layer graphene-based electrode serves as the photocathode. Multi-shaped Cu₂O nanoparticles, including truncated cubic shape, cuboctahedral shape, truncated octahedral shape, and octahedral shape, were then coated on square manganese nanorods on a few-layer graphene-based electrode as the photosensitizer. Finally, the efficiency of hydrogen production was measured and recorded. The Cu₂O nanoparticles/MnO–MnO₂ nanorods heterojunction generates photoelectrons to reduce hydrogen ions into hydrogen gas. The manganese dioxide nanorods were combined with cuprous oxide multi-shaped nanoparticles to be simultaneously utilized in hydrogen production as a photochemical water-splitting solar cell. The highest rate of hydrogen generation is 33.0 mL/min m² under solar simulation radiation. This study highlights the significance of a back electron–hole recombination loss and transportation process on the surface of a water-splitting photocathode, retarding the appearance of the photocurrent and requiring a greater amount of energy from a solar device.