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首页> 外文期刊>Electrochimica Acta >Cobalt(II) phosphonate coordination polymers: Synthesis, characterization and application as oxygen evolution electrocatalysts in aqueous media and water-saturated hydrophobic 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid
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Cobalt(II) phosphonate coordination polymers: Synthesis, characterization and application as oxygen evolution electrocatalysts in aqueous media and water-saturated hydrophobic 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid

机译：膦酸钴（II）配位聚合物：在水性介质和水饱和的疏水性1-丁基-3-甲基咪唑六氟磷酸盐离子液体中的析氧电催化剂的合成，表征和应用

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摘要

Four cobalt phosphonate coordination polymers Co[(CH_3PO_3)(H_2O)] (1), Co[C_2H_5PO_3)(H_2O)] (2), Co[(C_4H_9PO_3)(H_2O)] (3) and Co[(C_6H_5PO_3)(H_2O)] (4) have been synthesized using a hydrothermal method. Their crystal structures have been characterized by X-ray diffraction and all exhibit two-dimensional polymer structures. The water oxidation catalytic activities of these polymers have been studied for the first time using electrochemical methods in both aqueous solutions and water-saturated [BMIM][PF_6] ionic liquid (BMIM = 1-butyl-3-methylimidazolium). The results reveal that these polymers are able to catalyze water oxidation in aqueous media but are not fully stable in this environment. However, they are more stable and retain significant catalytic activity towards water oxidation in water-saturated [BMIM][PF_6] and addition of a buffer is not required. The catalytic activity decreases in the sequence of 1>2>3>4. Consequently, water-saturated [BMIM][PF_6] provides a good medium for catalytic water oxidation with this type of coordination polymer.
机译：四种钴酸钴配位聚合物Co [（CH_3PO_3）（H_2O）]（1），Co [C_2H_5PO_3）（H_2O）]（2），Co [（C_4H_9PO_3）（H_2O）]（3）和Co [（C_6H_5PO_3）（H_2O ）]（4）已使用水热法合成。它们的晶体结构已经通过X射线衍射表征，并且都表现出二维聚合物结构。在水溶液和水饱和的[BMIM] [PF_6]离子液体（BMIM = 1-丁基-3-甲基咪唑鎓）中，都使用电化学方法首次研究了这些聚合物的水氧化催化活性。结果表明，这些聚合物能够催化水性介质中的水氧化，但在这种环境下并不完全稳定。但是，它们更稳定，并且在水饱和的[BMIM] [PF_6]中保留了显着的对水氧化的催化活性，因此不需要添加缓冲剂。催化活性按1> 2> 3> 4的顺序降低。因此，水饱和的[BMIM] [PF_6]为这种类型的配位聚合物提供了催化水氧化的良好介质。

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