NDLI: Photoelectrode characteristics of an organic bilayer in water phase containing a redox molecule

Content Provider	Springer Nature Link
Author	Abe, Toshiyuki Nagai, Keiji Matsukawa, Takeshi Tajiri, Akio rimatsu, Takayoshi
Copyright Year	2006
Abstract	We have recently reported that the organic bilayer of 3,4,9,10-perylenetetracarboxyl-bisbenzimidazole (PTCBI, n-type semiconductor) and 29H,31H-phthalocyanine (H2Pc, p-type semiconductor), which is a part of a photovoltaic cell, acts as a photoanode in the water phase (Abe et al., ChemPhysChem 5:716, [2004]); in that case, the generation of the photocurrent involving an irreversible thiol oxidation at the H2Pc/water interface took place to be coupled with hole conduction through the H2Pc layer, based on the photophysical character of the bilayer. In the present work, the photoelectrode characteristics of the bilayer were investigated in the water phase containing a redox molecule $${\left( {{\text{Fe}}\,^{{{{\text{III}}} \mathord{\left/ {\vphantom {{{\text{III}}} {{\text{II}}}}} \right. -} {{\text{II}}}}} {\left( {{\text{CN}}} \right)}^{{{3 - } \mathord{\left/ {\vphantom {{3 - } {4 - }}} \right. -} {4 - }}}_{6} } \right)}$$ , where the photo-induced oxidation and reduction for the $${\text{Fe}}\,^{{{{\text{III}}} \mathord{\left/ {\vphantom {{{\text{III}}} {{\text{II}}}}} \right. -} {{\text{II}}}}} {\left( {{\text{CN}}} \right)}^{{{3 - } \mathord{\left/ {\vphantom {{3 - } {4 - }}} \right. -} {4 - }}}_{6}$$ couple were found to take place at the bilayer. The photoanodic current involving the $${\text{Fe}}\,^{{{\text{II}}}} {\left( {{\text{CN}}} \right)}^{{4 - }}_{6}$$ oxidation efficiently occurred at the interface of H2Pc/water, similar to the previous example. In the view of the voltammograms obtained, it was noted that there are pin-holes in the H2Pc layer of the bilayer, leading to a cathodic reaction with $${\text{Fe}}\,^{{{\text{III}}}} {\left( {{\text{CN}}} \right)}^{{3 - }}_{6}$$ at the PTCBI surface especially in the dark; that is, the band bending at the PTCBI/water interface can essentially be reduced by applying a negative potential [e.g., < ∼ 0 V (vs Ag/AgCl)] to the PTCBI, when the cathodic reaction may take place through the conduction band of the PTCBI. Moreover, under that applied potential condition of irradiation, the photogenerated electron carrier part can move to the PTCBI surface, thus enhancing the reduction of $${\text{Fe}}\,^{{{\text{III}}}} {\left( {{\text{CN}}} \right)}^{{3 - }}_{6}$$ .
Starting Page	303
Ending Page	309
Page Count	7
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	11
Issue Number	2
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-04-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photoelectrochemistry Photoelectrode Organic semiconductor Electronic and Computer Engineering Condensed Matter Characterization and Evaluation Materials Industrial Chemistry/Chemical Engineering Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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