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Oxidation of some aliphatic polyols on anodically deposited MnO2

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Abstract

Galvanostatic steady state current potential measurements were carried out for oxidation of a series of aliphatic alcohols having varying number of hydroxyl groups. The anodically deposited layer of MnO2 on platinum was used as the electrode material. The deposit was characterised by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and electrode potential measurements. The catalytic role of MnO2 in the electro-oxidation of alcohols was indicated by the chronopotentiograms and the cyclic voltammograms. An analysis of the electrochemical data indicated a catalytic EC mechanism in which Mn (V) is generated electrochemically and consumed chemically in succession. Based on this and the hydrogen bonding interaction between alcoholic hydroxyl groups and MnO2 layer, a mechanism was proposed which accounts for the variation in the observed electrochemical reaction orders. Tafel behaviour was found to be followed only approximately. Current efficiency of the electrochemical oxidation of polyols was studied. Replacement of platinum by carbon as current collector was found to leave the electrocatalytic activity of the MnO2 deposit practically unaltered.

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Acknowledgment

Financial assistance from Defence Research Development Organization (DRDO, India), Jadavpur University and ICCR is gratefully acknowledged. One of the authors (D.D.) thanks J.U. and another (P.R.S.) thanks ICCR for providing research fellowships.

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  1. Department of Chemistry, Jadavpur University, Kolkata, 700 032, India

    Debasmita Das, Purabi Rani Samaddar, Pratik Kumar Sen & Kaushik Das

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  1. Debasmita Das
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  2. Purabi Rani Samaddar
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  3. Pratik Kumar Sen
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  4. Kaushik Das
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Correspondence to Kaushik Das.

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Das, D., Samaddar, P.R., Sen, P.K. et al. Oxidation of some aliphatic polyols on anodically deposited MnO2 . J Appl Electrochem 38, 743–749 (2008). https://doi.org/10.1007/s10800-008-9503-9

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  • DOI: https://doi.org/10.1007/s10800-008-9503-9

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