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Probing the charge recombination in rGO decorated mixed phase (anatase-rutile) TiO2 multi-leg nanotubes
Yalavarthi Rambabu, ,
Published in American Institute of Physics Inc.
2016
Volume: 6
   
Issue: 11
Abstract
Recombination of photo-generated charges is one of the most significant challenges in designing efficient photo-anode for photo electrochemical water oxidation. In the case of TiO2, mixed phase (anatase-rutile) junctions often shown to be more effective in suppressing electron-hole recombination compared to a single (anatase or rutile) phase. Here, we report the study of bulk and surface recombination process in TiO2 multi-leg nanotube (MLNTs) anatase-rutile (A-R) junctions decorated with reduced graphene oxide (rGO) layers, through an analysis of the photo-current and impedance characteristics. To quantify the charge transport/transfer process involved in these junctions, holes arriving at the interface of semiconductor/electrolyte were collected by adding H2O2 to the electrolyte. This enabled us to interpret the bulk and surface recombination process involved in anatase/rutile/rGO junctions for photo-electrochemical water oxidation. We correlated this quantification to the electrochemical impedance spectroscopy (EIS) measurements, and showed that in anatase/rutile junction the increase in PEC performance was due to suppression in electron-hole recombination rate at the surface states that effectively enhances the hole transfer rate to the electrolyte. On the other hand, in rGO wrapped A-R MLNTs junction it was due to both phenomenon i.e decrease in bulk recombination rate as well as increase in hole transfer rate to the electrolyte at the semiconductor/electrolyte interface. © 2016 Author(s).
About the journal
JournalData powered by TypesetAIP Advances
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN21583226
Open AccessNo
Concepts (19)
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    Electrochemical impedance spectroscopy
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    Electrolytes
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    Graphene
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    Heterojunctions
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    Image processing
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    Nanotubes
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    Oxide minerals
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    Photoelectrochemical cells
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    Titanium dioxide
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    Yarn
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    Charge recombinations
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    ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY MEASUREMENTS
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    ELECTRON HOLE RECOMBINATION RATE
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    ELECTRON-HOLE RECOMBINATION
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    IMPEDANCE CHARACTERISTICS
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    Reduced graphene oxides (rgo)
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    SEMICONDUCTOR/ELECTROLYTE INTERFACES
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    SURFACE RECOMBINATION PROCESS
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    Semiconductor junctions