Electron trapping induced electrostatic adsorption of cations: a general factor leading to photoactivity decay of nanostructured TiO2
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Electron trapping induced electrostatic adsorption of cations: a general factor leading to photoactivity decay of nanostructured TiO2Autoria
Data de publicació
2017-02Editor
Royal Society of ChemistryCita bibliogràfica
HE, Tao, et al. Electron trapping induced electrostatic adsorption of cations: a general factor leading to photoactivity decay of nanostructured TiO 2. Journal of Materials Chemistry A, 2017, vol. 5, no 14, p. 6455-6464.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.rsc.org/-/content/articlehtml/2017/ta/c7ta01132fVersió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
In this work, a mechanism of electron trapping induced electrostatic adsorption of electrolyte cations (ETIEA) is proposed to explain the general photoactivity decay of nanostructured TiO2 electrodes, usually occurring ... [+]
In this work, a mechanism of electron trapping induced electrostatic adsorption of electrolyte cations (ETIEA) is proposed to explain the general photoactivity decay of nanostructured TiO2 electrodes, usually occurring during the initial several minutes of photoelectrochemical (PEC) processes. A series of designed “electron trapping” experiments and combined photo/electrochemical measurements revealed that it is the defect states of TiO2 that lead to ETIEA. A higher amount of surface defects will lead to larger ETIEA, which consequently accelerates the photoactivity decay. Different from the well-known “trap-filling” effect that decreases transport resistance, we find that the electron-trapping induced electrostatic attraction cannot make trap states inactive but can increase the detrapping energy barrier of trapped electrons. Our research reveals an important but easily overlooked fact, that is, carrier kinetics in nanostructured TiO2 may not be able to reach a steady state. In other words, a stable photocurrent may not be obtained because the photoelectrochemical process will alter the carrier dynamics constantly due to the existence of defect states. This result could also be applicable to other photoactive semiconductors. [-]
Proyecto de investigación
NSFC (Grant No. 21171144, 21671205, and 21502134), the NSF of Shandong province (Grant No. ZR2013EMQ004 and J13LD11), the Basic and Frontier Technical Research Project of Henan Province (Grant No. 152300410228) and the University Innovation Team Project in Henan Province (Grant No. 15IRTSTHN004), China.Drets d'accés
© 2017 The Royal Society of Chemistry
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info:eu-repo/semantics/openAccess
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