期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 7, 期 9, 页码 1732-1735出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b00445
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资金
- W. M. Keck Foundation
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
Titania has attracted significant interest due to its broad catalytic applications, many of which involve titania nanoparticles in contact with aqueous electrolyte solutions. Understanding the titania nanoparticle/electrolyte interface is critical for the rational development of such systems. Here, we have employed liquid jet ambient pressure X-ray photoelectron spectroscopy (AP-XPS) to investigate the solid/electrolyte interface of 20 nm diameter TiO2 nanoparticles in 0.1 M aqueous nitric acid solution. The Ti 2p line shape and absolute binding energy reflect a fully oxidized stoichiometric titania lattice. Further, by increasing the X-ray excitation energy, the difference in O 1s binding energies between that of liquid water (O 1s(lig)) and the titania lattice (O 1s(lat)) oxygen was measured as a function of probe depth into the particles. The titania lattice, O 1s(lat), binding energy decreases by 250 meV when probing from the particle surface into the bulk. This is interpreted as downward band bending at the interface.
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