Effect of polyanion precursors on the rate of electrodeposition of hydrated tungsten oxide

IF 1.7 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Russian Chemical Bulletin Pub Date : 2024-10-26 DOI:10.1007/s11172-024-4379-3

L. V. Pugolovkin, A. A. Khokhlov

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Abstract

A quantitative study of the composition of metastable acidic tungstate-vanadate solutions was carried out. The main polyanions coexisting in the solutions were determined by means of UV spectroscopy. Effect of the initial V: W ratio on the nature and concentration of polyanions was determined. Electrochemical deposition of hydrated tungsten oxide films from mixed solutions was carried out. The addition of 5–30 mol.% of vanadium leads to a significant increase in the deposition rate, and these rates are higher than in analogous solutions with the addition of H₂O₂. It is shown, that the growth of films in mixed solutions is associated with the formation of the Lindquist polyanions [VW₅O₁₉]³⁻ and [V₂W₄O₁₉]⁴⁻ with high redox potentials. These polyanions are irreversibly destroyed upon reduction. The influence of various polyanions on the film growth was demonstrated in test experiments on the deposition from solutions prepared from individual salts of the polyanions. Films deposited from mixed tungstate-vanadate solutions contain a very low amount of vanadium as it was shown by elemental analysis.

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多阴离子前驱体对水合氧化钨电沉积速率的影响

研究人员对可析出的酸性钨酸盐-钒酸盐溶液的成分进行了定量研究。通过紫外光谱法确定了溶液中共存的主要聚阴离子。确定了初始 V：W 比率对多阴离子性质和浓度的影响。从混合溶液中进行了水合氧化钨薄膜的电化学沉积。添加 5-30 mol.% 的钒可显著提高沉积速率，且这些速率高于添加 H2O2 的类似溶液。研究表明，薄膜在混合溶液中的生长与高氧化还原电位的林奎斯特多阴离子 [VW5O19]3- 和 [V2W4O19]4- 的形成有关。这些聚阴离子在还原时会被不可逆地破坏。各种多聚阴离子对薄膜生长的影响已在用这些多聚阴离子的单个盐类制备的溶液进行沉积的测试实验中得到证实。元素分析表明，从钨酸盐-钒酸盐混合溶液中沉积的薄膜含钒量非常低。

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来源期刊

Russian Chemical Bulletin 化学-化学综合

CiteScore

2.70

自引率

47.10%

发文量

257

审稿时长

3-8 weeks

期刊介绍： Publishing nearly 500 original articles a year, by leading Scientists from Russia and throughout the world, Russian Chemical Bulletin is a prominent international journal. The coverage of the journal spans practically all areas of fundamental chemical research and is presented in five sections: General and Inorganic Chemistry; Physical Chemistry; Organic Chemistry; Organometallic Chemistry; Chemistry of Natural Compounds and Bioorganic Chemistry.