In-situ monitoring of redox processes of viologen at Au(hkl)single-crystal electrodes using electrochemical shell-isolated nanoparticle-enhanced Raman spectroscopy
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
In-situ monitoring of redox processes of viologen at Au(hkl)single-crystal electrodes using electrochemical shell-isolated nanoparticle-enhanced Raman spectroscopy
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| Creator |
Ba-Ying, Wen
Jun, Yi Ya-Hao, Wang Kanagaraj, M Hua, Zhang Kathiresan, M Jian-Feng, Li Zhong-Qun, Tian |
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| Subject |
Electroorganic
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| Description |
In-situ Raman/SERS studies of molecular adsorption/reaction behaviors at well-defined electrochemical interfaces
are important for understanding the fundamentals of electrochemical processes. However, it is still a
great challenge to perform such studies on model single-crystal surfaces as the smooth surface cannot support
surface plasmon resonance (SPR). In this work, shell-isolated nanoparticle-enhanced Raman spectroscopy was
combined with an electrochemical method (EC-SHINERS) to study the adsorption and redox transformation of
a resonant molecule viologen HS-8V8H at Au(hkl) single-crystal electrodes. Changes in the molecular structure
with potential were identified on different single-crystal surfaces, which explained the transformation process
of viologen fromV2+ state to V•+ and then V0. Facet-dependent SERS enhancementwas also observed,which results
from the different imaginary part of the dielectric function on Au(111), Au(100) and Au(110), and is supported
by the FEM simulations. Furthermore, a nonlinear resonant Raman process has been directly observed
in our experiments, which is consistent with the simulation results. These findings increase our understanding
of the electrochemical behavior of molecules in model systems.
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| Publisher |
Elsevier B.V.
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| Date |
2016
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3163/1/058-2016.pdf
Ba-Ying, Wen and Jun, Yi and Ya-Hao, Wang and Kanagaraj, M and Hua, Zhang and Kathiresan, M and Jian-Feng, Li and Zhong-Qun, Tian (2016) In-situ monitoring of redox processes of viologen at Au(hkl)single-crystal electrodes using electrochemical shell-isolated nanoparticle-enhanced Raman spectroscopy. Electrochemistry Communications, 72. pp. 131-134. ISSN 1388-2481 |
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| Relation |
http://www.elsevier.com/locate/elecom
http://cecri.csircentral.net/3163/ |
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