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首页> 外文期刊>Electrocatalysis >Electrochemistry Investigation of the Monolacunary and Their Transition Metal Substituent Keggin-Type Polyoxometalates
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Electrochemistry Investigation of the Monolacunary and Their Transition Metal Substituent Keggin-Type Polyoxometalates

机译：单lac及其过渡金属取代的Keggin型多金属氧酸盐的电化学研究

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摘要

The electrochemical and electrocatalytic behaviors of [XW11O39] (n-) and [XW11M(H2O)O-39] (m-) (X = B, Si, and P; M-II = Mn, Co, and Ni) polyoxometalates were studied with specific emphasis on the tungsten centers by cyclic voltammetry in aqueous solution. Electrochemical studies show the two or three stepwise cathodic/anodic peaks corresponding to the redox processes of W-VI centers. The reversibility of redox peaks increases for [SiW11M(H2O)O-39](6-) and [PW11M(H2O)O-39](5-) polyoxometalates; however, that of [BW11M(H2O)O-39](7-) maintains quasi-reversible. The redox waves of the W-O framework for all polyoxometalates are pH- and scan rate-dependent. The tungsten-centered waves for these compound show a classical potential shift as a function of acidity at pH = 2.2-4.2. The electrocatalysis behaviors of these compounds toward the reduction of nitrite ions have been studied in details. The plots of catalytic efficiency versus gamma for [XW11O39] (n-) and [XW11M(H2O)O-39] (m-) (X = B, Si, P; M-II = Mn, Co, Ni) show the catalytic efficiency of [BW11O39](9-) and [BW11M(H2O)O-39](7-) (M = Mn, Co, Ni) more than that of the other compounds which are mentioned in this article.
机译：[XW11O39]（n-）和[XW11M（H2O）O-39]（m-）（X = B，Si和P; M-II = Mn，Co和Ni）的电化学和电催化行为为通过循环伏安法研究水溶液中的钨中心。电化学研究表明，与W-VI中心的氧化还原过程相对应的两个或三个逐步的阴极/阳极峰。 [SiW11M（H2O）O-39]（6-）和[PW11M（H2O）O-39]（5-）多金属氧酸盐的氧化还原峰的可逆性增加;但是，[BW11M（H2O）O-39]（7-）的值保持准可逆。所有多金属氧酸盐的W-O框架的氧化还原波均与pH和扫描速率有关。这些化合物的钨中心波在pH = 2.2-4.2时显示出经典的电势位移与酸度的关系。已详细研究了这些化合物对亚硝酸根离子还原的电催化行为。 [XW11O39]（n-）和[XW11M（H2O）O-39]（m-）（X = B，Si，P; M-II = Mn，Co，Ni）的催化效率与γ的关系图[BW11O39]（9-）和[BW11M（H2O）O-39]（7-）（M = Mn，Co，Ni）的催化效率比本文提到的其他化合物更高。

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