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Surface Reconstruction of Facet‐Functionalized SrTiO 3 Nanocrystals for Photocatalytic Hydrogen Evolution
Author(s) -
Wang Bin,
Shen Shaohua,
Guo Liejin
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201501162
Subject(s) - overlayer , photocatalysis , nanocrystal , materials science , hydrogen , facet (psychology) , chemical engineering , photochemistry , redox , catalysis , nanotechnology , chemical physics , chemistry , organic chemistry , psychology , social psychology , personality , engineering , metallurgy , big five personality traits
The surface structure determines the surface electronic and chemical properties of semiconducting nanocrystals for efficient photocatalysis. Herein, SrTiO 3 nanocrystals enclosed by {0 0 1} and {0 2 3} facets functionalized for photoreduction and photooxidation, respectively, were surface‐reconstructed with a disordered overlayer created by a thermal hydrogenation process. These surface‐reconstructed SrTiO 3 nanocrystals showed much higher photocatalytic activities than the pristine SrTiO 3 , which was attributed to the enhanced charge transfer ability and accelerated oxidative reaction kinetics induced by the oxygen vacancies in disordered overlayer. Given the maintained {0 0 1} and {0 2 3} facets ensuring spatial charge separation and functioning for reduction and oxidation reactions, respectively, the surface‐reconstructed SrTiO 3 nanocrystals enclosed with {0 2 3} and {0 0 1} facets in appropriate ratio showed the highest photocatalytic activity for hydrogen evolution.