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Title: Anode Processes on Pt and Ceramic Anodes in Chloride and Oxide-Chloride Melts
Authors: Mullabaev, A. R.
Kovrov, V. A.
Kholkina, A. S.
Zaikov, Y. P.
Issue Date: 2022
Publisher: Korean Nuclear Society
Elsevier BV
Citation: Anode Processes on Pt and Ceramic Anodes in Chloride and Oxide-Chloride Melts / A. R. Mullabaev, V. A. Kovrov, A. S. Kholkina et al. // Nuclear Engineering and Technology. — 2022. — Vol. 54. — Iss. 3. — P. 965-974.
Abstract: Platinum anodes are widely used for metal oxides reduction in LiCl–Li2O, however high-cost and low-corrosion resistance hinder their implementation. NiO–Li2O ceramics is an alternative corrosion resistant anode material. Anode processes on platinum and NiO–Li2O ceramics were studied in (80 mol.%)LiCl-(20mol.%)KCl and (80 mol.%)LiCl-(20 mol.%)KCl–Li2O melts by cyclic voltammetry, potentiostatic and galvanostatic electrolysis. Experiments performed in the LiCl–KCl melt without Li2O illustrate that a Pt anode dissolution causes the Pt2+ ions formation at 3.14 V and 550°С and at 3.04 V and 650оС. A two-stage Pt oxidation was observed in the melts with the Li2O at 2.40 ÷ 2.43 V, which resulted in the Li2PtO3 formation. Oxygen current efficiency of the Pt anode at 2.8 V and 650°С reached about 96%. The anode process on the NiO–Li2O electrode in the LiCl–KCl melt without Li2O proceeds at the potentials more positive than 3.1 V and results in the electrochemical decomposition of ceramic electrode to NiO and O2. Oxygen current efficiency on NiO–Li2O is close to 100%. The NiO–Li2O ceramic anode demonstrated good electrochemical characteristics during the galvanostatic electrolysis at 0.25 A/cm2 for 35 h and may be successfully used for pyrochemical treating of spent nuclear fuel. © 2021 Korean Nuclear Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85114687523
ISSN: 1738-5733
metadata.dc.description.sponsorship: The present research was partially performed within the Proryv (Breakthrough) project of State Atomic Energy Corporation Rosatom.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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