期刊论文详细信息
Nuclear Engineering and Technology
Anode processes on Pt and ceramic anodes in chloride and oxide-chloride melts
V.A. Kovrov1  A.S. Kholkina2  Yu.P. Zaikov2  A.R. Mullabaev2 
[1] Corresponding author.;Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, 20 Academicheskaya Str, Ekatherinburg, 620990, Russia;
关键词: Electrolysis;    Pt anode;    Ceramic anode;    LiCl;    Li2O;    Spent nuclear fuel;   
DOI  :  
来源: DOAJ
【 摘 要 】

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.

【 授权许可】

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