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Solvent and thiourea adsorption/intercalation effects on the solid-state electrochemistry of α-phase nickel hydroxide nanoparticles

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Abstract

Nanoparticles of α-phase nickel hydroxide were synthesized by a single-step hydrothermal method using urea as the hydrolytic agent. Precipitated powders were of pure turbostratic α-phase as confirmed by x-ray diffraction profile. The ageing of α-Ni(OH)2 in 1.0 M alkali solutions is investigated for pure non-intercalated α-Ni(OH)2 and thiourea intercalated/absorbed α-phase nanomaterials. The α-Ni(OH)2 powder immobilized on the surface of graphite electrodes shows a gradual α→β phase transformation with continuous voltammetric cycling, and the concentration gradient of water that exists in the layered-double-hydroxide-like interlayers of α-phase and the solution was shown to play a crucial role on the high electrochemical activity of this phase nickel hydroxide. To understand the role of water in the ageing process, concomitant entries of non-aqueous solvents like ethanol and acetonitrile along with thiourea were effected. Cyclic voltammetric measurements of thiourea-treated α-Ni(OH)2 samples revealed that hydroxyl ion influx during the anodic oxidation depends on the counter flux of solvent molecules, and if the intercalated the solvent is acetonitrile, then the electrochemical activity of α-Ni(OH)2 reduced drastically; Q a/Q c>1 for water as solvent in the interlayers α-Ni(OH)2 and Q a/Q c<1 for ethanol and acetonitrile as solvents. The α-phase gets stabilized in the presence of thiourea with water and ethanol as co-intercalates. Transmission electron microscope images of α-Ni(OH)2 and thiourea-treated samples show a change in particle size and morphology. Elemental CHNS analysis confirms the presence of sulphur in the thiourea intercalated samples.

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Authors and Affiliations

  1. Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007, India

    M. Jayalakshmi, P. Radhika, K. Phani Raja & M. Mohan Rao

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  1. M. Jayalakshmi
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  2. P. Radhika
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  3. K. Phani Raja
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  4. M. Mohan Rao
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Correspondence to M. Mohan Rao.

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Jayalakshmi, M., Radhika, P., Raja, K.P. et al. Solvent and thiourea adsorption/intercalation effects on the solid-state electrochemistry of α-phase nickel hydroxide nanoparticles. J Solid State Electrochem 11, 165–172 (2007). https://doi.org/10.1007/s10008-005-0081-z

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  • DOI: https://doi.org/10.1007/s10008-005-0081-z

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