Journal
CHEMELECTROCHEM
Volume 6, Issue 3, Pages 876-884Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201801649
Keywords
co-reduction; electrochemical behaviour; intermetallic compound; LiCl-KCl; thermodynamic properties
Categories
Funding
- Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education
- National Natural Science Foundation of China [21790373, 51774104, 51574097]
- Science Foundation of Heilongjiang Province [LC2016018]
- Scientific Research and Special Foundation Heilongjiang Postdoctoral Science Foundation [LBHQ15019, LBH-Q15020, LBH-TZ0411]
- Fundamental Research funds for the Central Universities
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In this report, the electrochemical behaviors of Pr(III) and Ni(II) ions on a W electrode were investigated in LiCl-KCl eutectic by cyclic voltammetry (CV), square wave voltammetry (SWV), chronopotentiometry (CP) and open-circuit chronopotentiometry (OCP) techniques. From the results of electrochemical methods, different signals corresponding to seven kinds of intermetallic compounds in the phase diagram of Pr-Ni were observed. The thermodynamic properties of intermetallic compounds in the temperature range of 823-923 K were investigated by open-circuit chronopotentiometry. With the evaluated apparent standard potentials of Pr-Ni intermetallic compounds, the Gibbs energies, enthalpies and entropies of formation were also calculated. The co-reduction products by galvanostatic and potentiostatic electrolysis were characterized based on X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The shape of the alloy obviously changes from granular to bulk, and the alloy phase changes from Pr-rich to Ni-rich. The co-reduction products of PrNi5, PrNi2 and PrNi were identified.
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