期刊
NANO ENERGY
卷 62, 期 -, 页码 507-512出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.068
关键词
In situ TEM; Liquid cell TEM; Photocatalysis; Water splitting; Facet-dependent behavior
类别
资金
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division under situ TEM program (KC22ZH) program [DE-AC02-05-CH11231]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- China Scholarship Council [201606310151]
- Alexander von Humboldt Foundation
- NSFC [21621091]
- Natural Science Foundation of Fujian Province of China [2015J01063]
We report an investigation of the pseudo-photocatalytic behavior of rutile TiO2 nanorods for water splitting observed with liquid cell transmission electron microscopy (TEM). The electron beam serves as a light source to initiate the catalytic reaction and a water-in-salt aqueous solution is employed as the electrolyte. The observation reveals that bubbles are generated preferentially residing near the {110} facet of a rutile TiO2 nanorod under a low electron dose rate (9.3-18.6 e(-)/angstrom(2).s). These bubbles are ascribed to hydrogen gas generated from the pseudo-photocatalytic water splitting. As the electron beam current density increases to 93 e(-)/angstrom(2).s, bubbles are also found at the {001} and {111} facets as well as in the bulk liquid solution, demonstrating the dominant effects of water electrolysis by electron beam under higher dose rates. The facet-dependent pseudo-photocatalytic behavior of rutile TiO2 nanorods is further validated using density functional theory (DFT) calculation. Our work establishes a facile liquid cell TEM setup for the study of pseudo-photocatalytic water splitting and it may also be applied to investigation of other photo-activated phenomena occurring at the solidliquid interfaces.
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