NDLI: Inhibiting effect of carbonate on the photoinduced flatband potential shifts during water photooxidation at TiO2/solution interface

Content Provider	Springer Nature Link
Author	Cheng, Xin Kong, De Sheng Wang, Ze Feng, Yuan Yuan Li, Wen Juan
Copyright Year	2017
Abstract	The TiO2/solution interfacial junction is of scientific and practical importance in the field of photoelectrochemical water splitting. Illumination of this interface usually induces unwanted positive shifts in the flatband potential of TiO2 photoelectrode. In this paper, the inhibiting effect of carbonate on the flatband potential shifts during water oxidation at the illuminated TiO2/solution interface was investigated in pH 6–14 solutions by using Mott-Schottky measurement technique. The footprints of the photohole trapping at the TiO2 surface were traced. Most significant effects of the carbonate additive on the flatband potential shifts and on the interfacial charge densities of surface-trapped holes (STHs) were observed in pH < 12 near-neutral and weak-basic solutions. Based on a generalized surface-OH oxidation mechanism of water photooxidation, the experimental results were interpreted. Some novel features and/or properties for the photohole transport kinetics, such as the preferential surface-OH sites for initial hole trapping into TiO2 surface, pH- and carbonate-dependent charge density of STHs, and the kinetic rate determining step (RDS), were revealed and discussed by correlating the differentiated long-lived and short-lived STHs with photogenerated surface intermediate species of water oxidation. The results and discussion reported in this work provide new physical insights for understanding the mechanisms of water photooxidation.
Starting Page	1467
Ending Page	1475
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	21
Issue Number	5
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photoelectrochemistry Water splitting Flatband potential shift Surface charge TiO2 nanotubes Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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