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Title: Cyclic voltammetry of Ga(III) in sodium perchlorate and sodium thiocyanate at static mercury drop electrode
Authors: Sharma, H S
Bhardwaj, T K
Jain, P C
Aggarwal, S K
Issue Date: Mar-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int.Cl.8 G01N27/00
Abstract: Cyclic voltammetry (CV) of Ga(III)/Ga electrode process has been investigated in sodium perchlorate as well as in sodium perchlorate containing sodium thiocyanate, at Static Mercury Drop Electrode (SMDE). Large difference between cathodic and anodic peak potentials (ΔE ≈600 mV) and ratio of anodic to cathodic peak current (Ipc/Ipa ≈0.1) confirm that the electrode process involving electro- reduction of Ga(III ) and electrooxidation of Ga is highly irreversible at SMDE. Effect of concentrations of sodium perchlorate, sodium thiocyanate and scan rate on the CV behaviour has also been studied. The Ga(III)/Ga electrode process remains highly irreversible in 1-4 M  sodium perchlorate. However, positive shift of ≈480 mV in cathodic peak potential is observed on adding 0.5 M sodium thiocyanate to sodium perchlorate and the CV behaviour approaches closer to reversible in 4 M NaClO4+O.5 M NaSCN. Maximum anodic and cathodic peak currents of unequal heights are observed at 0.5 M sodium thiocyanate in 4 M sodium perchlorate. The electrode processes of Ga(III) reduction has been found to be diffusion controlled in 3-4 M NaClO4 in presence of 0.5 M NaSCN and electro-oxidation in 2-4 M NaClO4 in presence or 0.5 M sodium thiocyanate. Controlled potential coulometry confirms that Ga(III)/Ga  electrode process involves three electron transfer and electro-oxidation of Ga to Ga (III) is much faster as compared to electro-reduction of Ga (III) in 4 M NaClO4+0.5 M NaSCN.
Page(s): 643-647
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.45A(03) [March 2006]

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