Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 9, Pages 1965-1973Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00579
Keywords
Water splitting; Photocathode; Back electron-hole recombination loss; Cuprous oxide; Graphene; Manganosite
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Funding
- Ministry of Science and Technology in Taiwan [102-2221-E-006-293 -MY3, 104-2622-E-006-028-CC3, 103-2622-E-006-040-CC2]
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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. rate of hydrogen generation is 33.0 mL/min m(2) 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.
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