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Molecular Assembly: Photocatalytic Splitting of Water into Hydrogen and Oxygen

SpeakerChen-Ho Tung

Date: Wednesday, 20th April 2016

Time: 3:00 PM

Venue: Yifu Conference Centre for academic report,3F

AbstractOne of the best solutions for meeting future energy demands is the conversion of water into hydrogen fuel using solar energy. The splitting of water into molecular hydrogen (H2) and oxygen (O2) using light involves two half-reactions: the oxidation of water to O2 and the reduction of protons to H2. To take advantage of the full range of the solar spectrum, researchers have extensively investigated artificial photosynthesis systems consisting of two photosensitizers and two catalysts with a Z-configuration: one photosensitizer-catalyst pair for H2 evolution and the other for O2 evolution. This report reviews advances our laboratory has made in the development of new systems for photocatalytic H2 evolution that uses earth-abundant materials and is both efficient and durable. We constructed several assemblies of CdTe and CdSe QDs as photosensitizers with [FeFe]-H2ase mimics as catalysts. These assemblies produced H2 in aqueous solutions photocatalytically and efficiently, with turnover numbers (TONs) up to tens of thousands. Assemblies of 3-mercaptopropionic acid (MPA)-capped CdTe QDs with Co2+ ions formed Coh-CdTe hollow nanospheres, and (MPA)-capped-CdSe QDs with Ni+ ions produced Nih-CdSe/CdS core/shell hybrid in situ in aqueous solutions upon irradiation. The resulting photocatalytic systems proved robust for H2 evolution. These systems showed excellent activity and impressive durability in the photocatalytic reaction, suggesting that they can serve as a valuable part of an overall water splitting system.



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