An alternative approach to ascertain the rate-determining steps of TiO2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy

H. Liu, X. Z. Li, Y. J. Leng, W. Z. Li

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

In an attempt to ascertain the rate-determining steps (RDS) of TiO2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO2-coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.

Original languageEnglish (US)
Pages (from-to)8988-8996
Number of pages9
JournalJournal of Physical Chemistry B
Volume107
Issue number34
StatePublished - Aug 28 2003

Fingerprint

Electrochemical impedance spectroscopy
impedance
spectroscopy
Oxidation
Charge transfer
oxidation
arcs
Adsorption
charge transfer
Acids
acids
adsorption
Display devices
mathematical models
Mathematical models
simulation
Degradation
reactors
Electrodes
degradation

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

@article{c2f1f2a6f40a4f248643bec71beb73c3,
title = "An alternative approach to ascertain the rate-determining steps of TiO2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy",
abstract = "In an attempt to ascertain the rate-determining steps (RDS) of TiO2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO2-coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.",
author = "H. Liu and Li, {X. Z.} and Leng, {Y. J.} and Li, {W. Z.}",
year = "2003",
month = "8",
day = "28",
language = "English (US)",
volume = "107",
pages = "8988--8996",
journal = "Journal of Physical Chemistry B",
issn = "1520-6106",
number = "34",

}

An alternative approach to ascertain the rate-determining steps of TiO2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy. / Liu, H.; Li, X. Z.; Leng, Y. J.; Li, W. Z.

In: Journal of Physical Chemistry B, Vol. 107, No. 34, 28.08.2003, p. 8988-8996.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An alternative approach to ascertain the rate-determining steps of TiO2 photoelectrocatalytic reaction by electrochemical impedance spectroscopy

AU - Liu, H.

AU - Li, X. Z.

AU - Leng, Y. J.

AU - Li, W. Z.

PY - 2003/8/28

Y1 - 2003/8/28

N2 - In an attempt to ascertain the rate-determining steps (RDS) of TiO2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO2-coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.

AB - In an attempt to ascertain the rate-determining steps (RDS) of TiO2 photoelectrocatalytic (PEC) reaction, the PEC oxidation of sulfosalicyclic acid (SSA) solution in a TiO2-coated electrode reactor system was monitored by applying the electrochemical impedance spectroscopy (EIS) method. In the meantime, an EIS mathematical model was first established to theoretically simulate the PEC reaction. Based on the EIS model, the theoretical simulation indicates three typical reactions in a PEC oxidation process, which include the charge-transfer-dominated reaction, both the charge-transfer- and adsorption-dominated reaction, and the adsorption-dominated reaction. The experimental results of EIS measurement showed that there was only one arc/semicircle on the EIS plane display when the external bias applied was below 200 mV (vs SCE) in the SSA PEC degradation whereas there were two arcs/semicircles when the externally applied bias exceeded 200 mV (vs SCE). The experimental results have a good agreement with the model simulation. The EIS method in this study provide an easier way to determine the RDS in a PEC oxidation process, which would be helpful to better control the reaction in practice.

UR - http://www.scopus.com/inward/record.url?scp=0043197240&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0043197240&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0043197240

VL - 107

SP - 8988

EP - 8996

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 34

ER -