Electrochemical Behavior of Neptunium in NaCl–2CsCl Melt

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  • HAYASHI Hirokazu
    Nuclear Science and Engineering Center, Japan Atomic Energy Agency
  • MINATO Kazuo
    Nuclear Science and Engineering Center, Japan Atomic Energy Agency

Abstract

<p>The electrochemical behavior of neptunium in NaCl–2CsCl melt at 823–923 K was investigated by cyclic voltammetry, differential pulse voltammetry, and open-circuit chronopotentiometry after polarization. The results show that Np4+ ions are reduced to Np metal by a two-step mechanism via Np3+ ions in the NaCl–2CsCl melt. The diffusion coefficients of Np3+ and Np4+ ions were determined from cyclic voltammograms. The apparent standard potentials of Np3+/Np0 and Np4+/Np3+ redox couples have been determined to be E*(Np3+/Np0) = −3.353 + 7.67 × 10−4 T and E*(Np4+/Np3+) = −1.175 + 4.99 × 10−4 T vs. Cl2/Cl− (V), respectively. The activity coefficients of Np3+ and Np4+ ions were also determined using the reported data on the Gibbs free energy of formation for NpCl3 and NpCl4 in a supercooled liquid state.</p>

Journal

  • Electrochemistry

    Electrochemistry 92 (4), 043020-043020, 2024-04-05

    The Electrochemical Society of Japan

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