Atomic‐Layer‐Confined Doping for Atomic‐Level Insights into Visible‐Light Water Splitting
- 25 June 2015
- journal article
- research article
- Published by Wiley in Angewandte Chemie-International Edition
- Vol. 54 (32), 9266-9270
- https://doi.org/10.1002/anie.201503410
Abstract
A model of doping confined in atomic layers is proposed for atomic‐level insights into the effect of doping on photocatalysis. Co doping confined in three atomic layers of In2S3 was implemented with a lamellar hybrid intermediate strategy. Density functional calculations reveal that the introduction of Co ions brings about several new energy levels and increased density of states at the conduction band minimum, leading to sharply increased visible‐light absorption and three times higher carrier concentration. Ultrafast transient absorption spectroscopy reveals that the electron transfer time of about 1.6 ps from the valence band to newly formed localized states is due to Co doping. The 25‐fold increase in average recovery lifetime is believed to be responsible for the increased of electron–hole separation. The synthesized Co‐doped In2S3 (three atomic layers) yield a photocurrent of 1.17 mA cm−2 at 1.5 V vs. RHE, nearly 10 and 17 times higher than that of the perfect In2S3 (three atomic layers) and the bulk counterpart, respectively.Keywords
This publication has 26 references indexed in Scilit:
- Water photolysis at 12.3% efficiency via perovskite photovoltaics and Earth-abundant catalystsScience, 2014
- Oxygen Vacancies Confined in Ultrathin Indium Oxide Porous Sheets for Promoted Visible-Light Water SplittingJournal of the American Chemical Society, 2014
- Nanoporous BiVO 4 Photoanodes with Dual-Layer Oxygen Evolution Catalysts for Solar Water SplittingScience, 2014
- Efficient solar water splitting by enhanced charge separation in a bismuth vanadate-silicon tandem photoelectrodeNature Communications, 2013
- Freestanding Tin Disulfide Single‐Layers Realizing Efficient Visible‐Light Water SplittingAngewandte Chemie, 2012
- Freestanding Tin Disulfide Single‐Layers Realizing Efficient Visible‐Light Water SplittingAngewandte Chemie-International Edition, 2012
- Size and Structure Matter: Enhanced CO2 Photoreduction Efficiency by Size-Resolved Ultrafine Pt Nanoparticles on TiO2 Single CrystalsJournal of the American Chemical Society, 2012
- Fabrication of flexible and freestanding zinc chalcogenide single layersNature Communications, 2012
- Hydrogen-Treated TiO2 Nanowire Arrays for Photoelectrochemical Water SplittingNano Letters, 2011
- Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide NanocrystalsScience, 2011