Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF 4 -B 2 O 3 -KReO 4.

Autor:	Chernyshev, Aleksandr A., Arkhipov, Stepan P., Apisarov, Alexey P., Shmygalev, Aleksander S., Isakov, Andrey V., Zaikov, Yury P.
Předmět:	RHENIUM COMPLEX ions CYCLIC voltammetry DIFFUSION coefficients ELECTROPLATING DIFFUSION control
Zdroj:	Materials (1996-1944); Dec2022, Vol. 15 Issue 23, p8679, 10p
Abstrakt:	The electrochemical behavior of rhenium ions in the molten KF-KBF4-B2O3 salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF4-B2O3 were determined using cyclic voltammetry, stationary galvanostatic and polarization curves analyses. The values of diffusion coefficients were 3.15 × 10−5 cm2/s and 4.61 × 10−5 cm2/s for R1 and R2, respectively. Rhenium electrodeposition was carried out at a constant potential. The process of rhenium cathode reduction in KF-KBF4-B2O3 at 773 K was found to be a one-step reaction Re(VII) → Re, and rhenium electrodeposition presumably occurred from two types of complex rhenium ions (KReO4 and K3ReO5). Both processes are quasi-reversible and controlled by diffusion. The obtained cathode deposit was analyzed by SEM, EDX, ICP-OES and XRD methods. The obtained deposit had a thread structure and rhenium was the main component. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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