• V S Muralidharan

      Articles written in Journal of Chemical Sciences

    • Electrochemical behaviour of Cu-NTA complexes

      R M Krishnan V S Muralidharan

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      The deposition of copper was found to involve adsorbed monovalent copper which follows nonactivated Temkin isotherm. The presence of nitrilotriacetic acid stabilises it and the second electron transfer is slow.

    • An insight into the self-discharge of Fe3O4 electrodes in alkali solutions

      M Jayalakshmi V S Muralidharan

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      Iron oxide development is necessary as the Iron electrodes exhibit high self discharge and poor charging efficiency in alkaline batteries. Pressed electrodes containing electrolytic iron powder with varying amounts of Fe3O4 have been used. The variation of open circuit potential and self discharge currents with alkali concentration is followed. For better understanding of these variations, cyclic polarisation (−1.3 V to + 0.4 Vvs Hg/HgO) and hydrogen evolution studies are carried out. Beyond −0.5 Vvs Hg/HgO, the surface is covered by hydrolysed layer and the protons diffuse away from this layer. The hydrogen evolution takes place with the discharge of K+ ions as the rate determining step.

    • Electrochemical behaviour of zinc gluconate complexes

      V S Vasantha V S Muralidharan

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      Voltammetric studies revealed that under transient conditions in the pH range 3.7 to 5.0, the deposition of zinc from ZnSO4 solutions involves the formation of adsorbed monovalent zinc. The conversion of divalent zinc to monovalent is a slow step. In the presence of gluconate, the reduction of divalent complex involves the monovalent zinc complex and the second electron transfer is slow. In the pH range 10 to 12.5, the zinc complex may be [(Zn(GH4)4]2- and is found to vary with gluconate and OH- ions. The conversion of [Zn(GH4)(OH)abs-] to Zn(OH)2 or Zn(GH4)2 is the slow step in the reduction of the complexes. In strong alkali solutions sodium gluconate forms zinc hydroxy gluconate complexes. [Zn(OH)3(GH4)]2- to adsorbed [Zn(OH)(GH4)]- is the slow step in the reduction.

    • Electrochemical behaviour of alkaline copper complexes

      C L Aravinda S M Mayanna V S Muralidharan

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      A search for non-cyanide plating baths for copper resulted in the development of alkaline copper complex baths containing trisodium citrate [TSC] and triethanolamine [TEA]. Voltammetric studies were carried out on platinum to understand the electrochemical behaviour of these complexes. In TSC solutions, the deposition of copper involves the slow formation of a monovalent species. Adsorption of this species obeys Langmuir isotherm. In TEA solutions the deposition involves the formation of monovalent ions obeying the non-activated Temkin isotherm. Conversion of divalent to monovalent copper is also slow. In TEA and TSC alkaline copper solutions, the predominant species that undergo stepwise reduction contain only TEA ligands.

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