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Triangular potential sweep voltammetric study of porous iron electrodes in alkali solutions

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Abstract

The cyclic voltammograms of pure iron and sintered iron electrodes in 6.0m KOH solutions revealed a plateau and two anodic peaks in the forward direction and two cathodic peaks in the backward direction when polarized from −1.3 to −0.3 V vs Hg/HgO. In the forward scan the formation of Fe(OH)2 and FeOOH occurs and these are subsequently reduced to Fe(OH)2 and iron in the backward scan. The peak potential separation of the Fe/Fe(II) and Fe(II)/Fe(III) couples at zero sweep rate and the ratio of cathodic to anodic charges at zero sweep rates for the above two redox couples have been used to evaluate the reversibility of porous iron electrodes. Additions of LiOH, Na2S, FeS, sulphur, Sb2O3 and As2O3 on the reversibility of these redox couples have been discussed. A suitable electrode fabrication condition has been suggested.

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Authors and Affiliations

  1. Central Electrochemical Research Institute, 623006, Karaikudi, India

    G. Paruthimal Kalaignan, V. S. Muralidharan & K. I. Vasu

Authors
  1. G. Paruthimal Kalaignan
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  2. V. S. Muralidharan
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  3. K. I. Vasu
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Kalaignan, G.P., Muralidharan, V.S. & Vasu, K.I. Triangular potential sweep voltammetric study of porous iron electrodes in alkali solutions. J Appl Electrochem 17, 1083–1092 (1987). https://doi.org/10.1007/BF01024374

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  • DOI: https://doi.org/10.1007/BF01024374

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