Photocatalytic water splitting by N-TiO2 on MgO(111) with exceptional quantum efficiencies at elevated temperature
Nature Communications Springer Nature 10:2019 (2019) 4421
Abstract:
Photocatalytic water splitting is attracting enormous interest for the storage of solar energy but no practical method has yet been identified. In the past decades, various systems have been developed but most of them suffer from low activities, a narrow range of absorption and poor quantum efficiencies (Q.E.) due to fast recombination of charge carriers. Here we report a dramatic suppression of electron-hole pair recombination on the surface of N-doped TiO2 based nanocatalysts under enhanced concentrations of H+ and OH−, and local electric field polarization of a MgO (111) support during photolysis of water at elevated temperatures. Thus, a broad optical absorption is seen, producing O2 and H2 in a 1:2 molar ratio with a H2 evolution rate of over 11,000 μmol g−1 h−1 without any sacrificial reagents at 270 °C. An exceptional range of Q.E. from 81.8% at 437 nm to 3.2% at 1000 nm is also reported.III-V compounds as single photon emitters
Journal of Semiconductors IOP Publishing 40:7 (2019) 071906
Unravelling the key role of surface features behind facet-dependent photocatalysis of anatase TiO2
Chemical Communications Royal Society of Chemistry 55:30 (2019) 4415-4418
Abstract:
The high activity of nanocrystallites is commonly attributed to the terminal high-energy facets. However, we demonstrate that the high activity of the anatase TiO2(001) facet in photocatalytic H2 evolution is not due to its high intrinsic surface energy, but local electronic effects created by surface features on the facet.Photonic molecules defined by SU-8 photoresist strips on a photonic crystal waveguide
Optics Express Optical Society of America (2018)
Nitride Single Photon Sources
2018 IEEE PHOTONICS CONFERENCE (IPC) (2018)