Cathodic deposition of molybdenum and vanadium mixed oxyhydroxide films from V-substituted polymolybdophosphate
Cathodic deposition of molybdenum and vanadium mixed oxyhydroxide films from V-substituted polymolybdophosphate
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DOI：
10.1016/j.electacta.2005.04.025
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发表时间：
2005-10-10
影响因子：
6.6
通讯作者：
Ogura, K
中科院分区：
文献类型：
--
作者：
Nakayama, M;Komatsu, H;Ogura, K
本文报道了以keggin型钒取代多磷酸钼为原料，在金电极上制备钼钒混合氢氧膜的新电化学路线。该过程涉及在0和-0.7 V之间的电位区域对9-钼(VI)-3-钒磷酸盐(V) （[PMo9V3O40](6-)）进行电位动力学还原。所得Mo-V氧化膜电极在pH为3的Na2SO4电解质中具有稳定的氧化还原行为。x射线光电子能谱分析表明，这是由于薄膜中Mo5+/Mo6+的氧化/还原，同时质子的提取/插入进行电荷补偿。沉积的V离子在重复电位循环后仍留在薄膜中，而不影响其氧化态。在亚硝酸钠存在下的伏安数据表明，Mo-V氢氧化物对亚硝酸钠的电还原具有电催化活性。(C) 2005 Elsevier Ltd版权所有。
We report a new electrochemical route for fabricating molybdenum and vanadium mixed oxyhydroxide films on Au electrode from Keggin-type vanadium-substituted polymolybdophosphate. The process involves a potentiodynamic reduction of aqueous 9-molybdo(VI)-3-vanadophosphosphate(V) ([PMo9V3O40](6-)) in the potential region between 0 and -0.7 V versus Ag/AgCl. The resulting Mo-V oxyhydroxide film electrode gave a stable redox behavior in Na2SO4 electrolyte of pH 3. X-ray photoelectron spectroscopy revealed that this results from oxidation/reduction of Mo5+/Mo6+ in the film which accompanies extraction/insertion of protons for charge compensation. The deposited V ions remained in the film upon repetitive potential cycling without affecting their oxidation state. Voltammetric data in the presence of sodium nitrite showed electrocatalytic activity of the Mo-V oxyhydroxide toward the electroreduction of nitrite. (C) 2005 Elsevier Ltd. All rights reserved.