Electrochemical behaviour of a vanadium anode in phosphoric acid and phosphate solutions

被引：5

作者：

Alonzo, V

Darchen, A

Le Fur, E

Pivan, JY

机构：

[1] Ecole Natl Super Chim Rennes, Lab Electrochim, F-35700 Rennes, France

[2] Ecole Natl Super Chim Rennes, Chim Solide Lab, UMR 6511, F-35700 Rennes, France

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 10期

关键词：

anodic electrodeposit; current oscillations; oxidation; passivation; vanadophosphate;

D O I：

10.1016/j.electacta.2005.06.030

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Anodic polarisation of a vanadium electrode has been studied in H3PO4 solutions and some phosphate solutions: LiH2PO4, NaH2PO4, KH2PO4 and NH4H2PO4. The anodic behaviour of a vanadium electrode showed similarities in weak concentrated H3PO4, in LiH2PO4 and NaH2PO4 solutions: the polarisation curve exhibited a current peak followed by current oscillations and then a current plateau. Concentrated H3PO4, 1 M KH2PO4 and NH4H2PO4 solutions involved vanadium passivation with a very slight current density plateau. Yellow compound identified to VOPO4.2H(2)O was obtained after controlled potential oxidation of vanadium in 5-10 M H3PO4. Green products were obtained in 1 M phosphate solutions and in 1-3 M H3PO4 on vanadium anode after controlled potential electrolysis. All these vanadophosphate compounds contained the monovalent cation which was present in the solution. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1990 / 1995

页数：6

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