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Activated hopping of the hydroxide ion through electrodeposited thin films of electrochromic cobalt oxyhydroxide

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Abstract

Thin films of cobalt(II) oxyhydroxide on platinum have been prepared by electrodeposition. The chemical diffusion coefficient D of the hydroxide ion through the material has a marked temperature dependence, showing a simple activated behaviour in the range 273–292 K. The activation energy to ionic movement was rather large at 54.5 kJ mol−1 which, it is proposed, is ascribable to ion hopping. When spins have changed alignment, at the Néel transition temperature T Nr the activation energy more than doubled to 125 kJ mol−1; and the diffusion coefficients obtained above this temperature also increased dramatically. It is proposed that structural changes occur in the electrodeposited oxide at about T Nr hence the change in activation energy.

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Authors and Affiliations

  1. Department of Chemistry, Manchester Metropolitan University, Chester Street, M1 5GD, Manchester, U.K.

    P. M. S. Monk & N. Farooq

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  1. P. M. S. Monk
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  2. N. Farooq
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Monk, P.M.S., Farooq, N. Activated hopping of the hydroxide ion through electrodeposited thin films of electrochromic cobalt oxyhydroxide. J Mater Sci: Mater Electron 6, 389–392 (1995). https://doi.org/10.1007/BF00144639

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  • DOI: https://doi.org/10.1007/BF00144639

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