Electrochemical properties and state of paramagnetic centers in copper-modified complex vanadium and titanium oxides期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Electrochemical properties and state of paramagnetic centers in copper-modified complex vanadium and titanium oxides

Authors:	G S Zakharova L Yu Buldakova V L Volkov L S Molochnikov E G Kovaleva

Institution:	(1) Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620219, Russia;(2) Ural State University of Forestry Engineering, Yekaterinburg, Russia

Abstract:	Complex vanadium and titanium oxides modified by copper ions are studied by the electrochemical and ESR methods. Oxides Cu_xV_2?yTi_yO_5?δ·nH₂O (0<y<1.33) have a layered structure and oxides Cu_xTi_1?yV_yO_5+δ·nH₂O (0<y<0.25), an anatase structure. The intercalation of cations Cu²⁺ into the hydrates leads to oxidation of V⁴⁺. According to ESR data, V⁴⁺ exists in the oxides in the form of VO²⁺ and an octahedral surround of oxygen (V⁴⁺?O₆), respectively. The electroreduction of ions of d-elements and chemisorbed oxygen in the oxides is analyzed. The intercalation of cations Cu²⁺ alters the content of V⁴⁺ and the chemisorption ability of the oxides. Possible reasons for this phenomenon are discussed.

Keywords:	xerogels of vanadium and titanium oxides copper(II) intercalation voltametry ESR spectroscopy
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