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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.