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. // ECS Transactions. - 2014. - V. 64, l. 4. - P. 389-404.

ISSN:

19385862

Type:

Conference 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/cm2 were niobium(III) species, NbCl6 3-. 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, NbCl6 2-, proceeds in a single step. Cathodic reduction of niobium(IV)-containing melts on tungsten electrode at -1.55÷-1.6 V (vs. Cl-/Cl2) 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. Copyright © 2014 by The Electrochemical Society. All rights reserved.

Author keywords:

Index keywords:

Absorption spectroscopy; Chlorine compounds; Chronoamperometry; Electrochemical electrodes; Electrochemical impedance spectroscopy; Electrodes; Fused salts; Ionic liquids; Salts; Spectroelectrochemist

DOI:

10.1149/06404.0389ecst

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921365823&doi=10.1149%2f06404.0389ecst&partnerID=40&md5=1f371c1ec6f916f705490d05e70ed92e

Соавторы в МНС:

Другие поля

Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921365823&doi=10.1149%2f06404.0389ecst&partnerID=40&md5=1f371c1ec6f916f705490d05e70ed92e
Affiliations	Department of Rare Metals and Nanomaterials, Ural Federal University, Ekaterinburg, Russian Federation; Redston Trevor Consulting, Ltd., Leeds, United Kingdom
References	Caton, R.D., Freund, H., (1964) Anal. Chem, 36, p. 15; Dartnell, J., Johnson, K.E., Shreier, L.L., (1964) J. Less ?Ommon ?Et, 6, p. 85; Suzuki, T., (1970) Electrochim. Acta, 15, p. 127; Kuznetsov, S.A., Morachevski, A.G., Stangrit, P.T., (1982) Electrochimiya, 18, p. 1522. , (in Russian); Maslov, S.V., Vasin, B.D., (1993) Rasplavy (Melts), (3), p. 66. , (in Russian); Picard, G., Bocage, P., (1991) Fr. Mater. Sci. Forum, 73-75, p. 305; Voyiatzis, G.A., Pavlatou, E.A., Papatheodorou, G.N., Bachtler, M., Freyland, W., (1993) Int. Symp. Molten Salt Chem. Techn., 252p. , 93-9, M.-L. Saboungi, H. Kojima, J. Duruz, and D. Shores. Editors, Honolulu; Lantleme, F., Barhoun, A., Chevalet, J., (1993) J. Electrochem. Soc., 140, p. 732; Schellkes, E., Hong, X., Holtz, M., Huniar, U., Ahlirchs, B., Freyland, W., (2003) Phys. Chem. Chem. Phys., 5, p. 5536; Maslov, S.V., Volkovich, V.A., Vasin, B.D., (1994) Rasplavy (Melts), (4), p. 37. , (in Russian); Rosenkilde, C., Voyiatzis, G., Jensen, V.R., Ystenes, M., Ostvold, T., (1995) Inorg. Chem., 34, p. 4360; Araurault, L., Bouteillon, J., Poignet, J.C., (1995) J. Electrochem. Soc., 142, p. 16; Kuznetsov, S.A., Kuznetsova, S.V., Glagolevskaya, A.L., (1996) Electrochimiya, 32, p. 1061. , (in Russian); Stohr, U., Freyland, W., (1999) Electrochim. Acta, 44, p. 2199; Mohamedi, M., Sato, Y., Yamamura, T., (1999) Electrochim. Acta, 44, p. 1559; Gillesberg, A., Von Barner, J.H., Bjerrum, N.J., Lantelme, F., (1999) J. Appl. Electrochem, 29, p. 939; Rebrin, O.I., Scherbakov, R.Yu., Polovov, I.B., Mihalev, S.M., Volkovich, V.A., Muhamadeev, A.S., Vasin, B.D., (2002) Molten Salts XIII, Proc. of the 13th Int. Symp, p. 460. , Molten Salts, 2002-19, H. C. Delong, R. W. Bradshaw, M. Matsunaga, G. R. Stafford, and P. C. Trulove. Editors, Philadelphia; Popova, A.V., Kuznetsov, S.A., (2008) Electrochimiya, 44, p. 992. , (in Russian); Vasin, B.D., Maslov, S.V., Volkovich, V.A., Polovov, I.B., Kazakov, S.A., Rebrin, O.I., (2005) Proc. 7-th Int. Symp. Molten Salts Chem. Techn., 1, 335p. , P. Taxil, C. Bessada, M. Cassir and M. Gaune-Escard, Editors, Toulouse; Rebrin, O.I., Yu, R., (1998) Scherbakov, Rasplavy (Melts), (6), p. 62. , (in Russian); Chernyshov, M.V., Polovov, I.B., Volkovich, V.A., Rebrin, O.I., Vasin, B.D., Vinogradov, K.V., Griffiths, T.R., (2012) ECS Trans., 50 (11), p. 325; Gibalo, I.M., (1967) Analytical Chemistry of Niobium and Tantalum, 66p. , Nauka, Moscow, in Russian
Editors	De Long H.C.Reichert W.M.Trulove P.C.Haverhals L.M.Mizuhata M.Mantz R.A.Ispas A.Bund A.
Sponsors	Electrodeposition Electrodeposition Division of the Electrochemical Society;Energy Technology Division of the Electrochemical Society;Physical and Analytical Electrochemistry Division of the Electrochemical Society
Publisher	Electrochemical Society Inc.
Conference name	19th International Symposium on Molten Salts and Ionic Liquids, MS and IL 2014, part of the Joint Meeting of the 226th ECS Meeting and 29th SMEQ Meeting
Conference date	5 October 2014 through 9 October 2014
Conference code	110021
ISBN	9781623321819
Language of Original Document	English
Abbreviated Source Title	ECS Transactions
Source	Scopus