1 September 2010 Photocatalytic water splitting with nano-K4Nb6O17
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As many water splitting photocatalysts only evolve hydrogen under irradiation due to complications with high energy water oxidation steps, a three component nano-catalyst was designed by combining sites for water reduction and oxidation with solar-charge-supplying semiconductor. The semiconductor framework was derived from K4Nb6O17, a known UV-light photocatalyst with a band gap of 3.5 eV. Following ion exchange and exfoliation with terabutyalammonium hydroxide, the layered material separates into nanosheets that coil into 1 ± 0.5 um long and 10 ± 5 nm wide nanoscrolls to redue surface energy. PT (reduction sites) and IrOx (oxidation sites) were photochecmically deposited on the surface of the nanoscrolls to produce two-and three-component nanostructures. Upon irradiation with UV-light, H2 was evolved from aqueous methanol and pure water, substoichiometric O2 from aqueous AgNo3. The band structures of each catalyst and reason for lack of O2 evolution from pure water was evaluated with cyclic voltammetry and photoelectrochemistry.
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Troy K. Townsend, Troy K. Townsend, Erwin M. Sabio, Erwin M. Sabio, Nigel D. Browning, Nigel D. Browning, Frank E. Osterloh, Frank E. Osterloh, } "Photocatalytic water splitting with nano-K4Nb6O17", Proc. SPIE 7770, Solar Hydrogen and Nanotechnology V, 77700I (1 September 2010); doi: 10.1117/12.860063; https://doi.org/10.1117/12.860063

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