Niobium Speciation in NaCl-KCl Based Melts: An Electrochemical and Spectroelectrochemical Study / Polovov I. B.,Chernyshov M. V.,Shuklin D. A.,Volkovich V. A.,Rebrin O. I.,Vasin B. D.,Griffiths T. R. // . - 2014. - V. 64, l. 4. - P. 389-404.

ISSN/EISSN:

1938-5862 / нет данных

Type:

Proceedings Paper

Abstract:

A variety of electrochemical techniques (polarization curves measurements, chronopotentiometry, chronoamperometry, linear, cyclic and square-wave voltammetry, impedance spectroscopy) were applied for studying electrode processes involving niobium species in NaCl-KCl-based melts. Information about niobium speciation was obtained by combining electrochemical and spectroscopic (measuring electronic absorption spectra) methods. The major product of niobium anodic dissolution in chloride melts at current densities up to 40 mA/cm(2) were niobium(III) species, NbCl63-. Soluble niobium(V) species, NbCl6-, represented the highest oxidation state of niobium in NaCl-KCl melts. It was shown that oxidation of Nb(IV) ions, NbCl62-, proceeds in a single step. Cathodic reduction of niobium(IV)-containing melts on tungsten electrode at -1.55 divided by-1.6 V (vs. Cl-/Cl-2) resulted in formation of niobium metal. Electrochemical and spectroelectrochemical data indicate that intermediate niobium(III) species can be formed during elecroreduction of NaCl-KCl-NbCln (n=3.8-4.1) melts.

Author keywords:

EUTECTIC MELT; CHLORIDE; METALS

DOI:

10.1149/06404.0389ecst

Web of Science ID:

ISI:000356725500043

Соавторы в МНС:

Другие поля

Поле	Значение
Editor	Reichert, WM and Ispas, A and Bund, A and DeLong, HC and Haverhals, LM and Mizuhata, M and Trulove, PC and Mantz, RA
Booktitle	MOLTEN SALTS AND IONIC LIQUIDS 19
Series	ECS Transactions
Note	19th Int Symposium on Molten Salts and Ion Liquids as part of the Joint Meeting of the 226th Meeting of the Electrochem Soc, the XXIX Congreso de la Sociedad Mexicana de Electroquinica / 7th Meeting of the Mexico Sect of the Electrochem Soc, Cancun, MEXICO, OCT 05-09, 2014
Organization	Electrochem Soc Phys \& Analyt Electrochemistry Div; Electrochem Soc Energy Technol Div; Electrochem Soc Electrodeposit Div
Publisher	ELECTROCHEMICAL SOC INC
Address	65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
Language	English
ISBN	978-1-60768-541-8
Keywords-Plus	EUTECTIC MELT; CHLORIDE; METALS
Research-Areas	Electrochemistry; Energy \& Fuels; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Electrochemistry; Energy \& Fuels; Metallurgy \& Metallurgical Engineering
ResearcherID-Numbers	Chernyshov, Mikhail/J-9951-2012 Volkovich, Vladimir/K-8339-2012
ORCID-Numbers	Chernyshov, Mikhail/0000-0002-6982-0600 Volkovich, Vladimir/0000-0003-4438-1194
Number-of-Cited-References	22
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	3
Doc-Delivery-Number	BC9PF