Abstract
Surface recombination of the photogenerated electron-hole pairs at semiconductor/electrolyte interface is one of the most essential reasons responsible for lowering photoconversion efficiency (Φ) of light to chemical energy for photoelectrochemical (PEC) water splitting reaction. In this paper，the catalytic effect of sodium carbonate on the oxygen evolution reaction (OER) over TiO2 nanotubes photoanode during PEC water splitting was investigated by performing photocurrent and ac impedance measurements. It was demonstrated that the addiction of 1 mmol•L-1 Na2CO3 in 0.5 mol•L-1 NaClO4 electrolyte can effectively improve the charge transfer properties for the photogenerated holes across TiO2/electrolyte interface and inhibit the recombination of photogenerated carriers at this interface. As a result，both the measured photocurrent was increased and the photoconversion efficiency was enhanced.
Graphical Abstract
Keywords
photogenerated holes, surface recombination, photocurrent, anodic oxygen evolution, Mott-Schottky analysis
Publication Date
2013-02-28
Online Available Date
2012-07-05
Revised Date
2012-06-30
Received Date
2012-06-04
Recommended Citation
De-sheng KONG, Jing WANG, Xue-di ZHANG, Xi ZHAO, Chao WANG, Yuan-yuan FENG, Wen-juan LI.
Sodium Carbonate Catalyzed Photoelectrochemical Water Splitting over TiO2 Nanotubes Photoanode[J]. Journal of Electrochemistry,
2013
,
19(1): 71-78.
DOI: 10.61558/2993-074X.2100
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol19/iss1/7
Included in
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