Voltammetric investigations on the relative deactivation of boron-doped diamond, glassy carbon and platinum electrodes during the anodic oxidation of substituted phenols in room temperature ionic liquids
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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Title |
Voltammetric investigations on the relative deactivation of boron-doped
diamond, glassy carbon and platinum electrodes during the anodic oxidation of substituted phenols in room temperature ionic liquids
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Creator |
Saravanan, KR.
Satyamoorthi, S. Velayutham, D. Suryanarayanan, V. |
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Subject |
Electrodics and Electrocatalysis
Electroorganic |
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Description |
Deactivation behaviour of boron-doped diamond (BDD) had been extensively studied for the first
time in three room temperature ionic liquids (RTILs) namely 1-ethyl-3-methyl imidazolium nonaflate
(EMIN), triethylmethylammonium methyl sulphate (TEMAMS) and N-hexyl-N,N,N-triethylammonium
bis(trifluoromethanesulfonyl)imide (N2226TFSI) along with glassy carbon (GC) and platinum (Pt) electrodes
on the anodic oxidation of 2,6-dimethylphenol (2,6-DMP), 2,4-dimethylphenol (2,4-DMP) and
3,4-methylenedioxyphenol (3,4-MDP) using cyclic voltammetry (CV). Voltammetric studies reveal that
the anodic potential limit of the electrodes decreases in the order GC > BDD > Pt in these media and EMIN
shows the highest anodic limit among the three RTILs. Multisweep CV studies suggest that the three
phenols show irreversible and reversible characteristics on the BDD and Pt electrodes respectively. On
the other hand, they exhibit reversible redox behaviour in TEMAMS and irreversible nature in EMIN and
N2226TFSI media on the GC electrode. The phenolic compounds get oxidised at higher potential on the BDD
electrode followed by Pt and GC electrodes and their oxidation potential in the three media increases in
the order: TEMAMS < EMIN < N2226TFSI. Anodic polarisation studies in presence of phenols suggests that
the Pt and GC do not show any serious electrode fouling; however, the BDD gets deactivated severely,
as noted from the I4 pa/I1
pa values. Passivation of the BDD electrode in the EMIN medium containing the
2,6-DMP was investigated by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM).
The effect of acetonitrile (CH3CN) on the activation of the BDD electrode surface was also studied in detail
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Publisher |
Elsevier
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Date |
2012
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cecri.csircentral.net/3020/1/030-2012.pdf
Saravanan, KR. and Satyamoorthi, S. and Velayutham, D. and Suryanarayanan, V. (2012) Voltammetric investigations on the relative deactivation of boron-doped diamond, glassy carbon and platinum electrodes during the anodic oxidation of substituted phenols in room temperature ionic liquids. Electrochimica Acta, 69. pp. 71-78. ISSN 0013-4686 |
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Relation |
http://www.elsevier.com/locate/electacta
http://cecri.csircentral.net/3020/ |
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