铜取代的多金属氧酸盐电催化水氧化性能研究

Polyoxometalate Based Copper Clusters as Catalysts for Electrochemical Water Oxidation

合成并表征了一个铜取代的多金属氧酸盐:[Cu_(5)(OH)_(4)(H_(2)O)_(2)(A-a-SiW_(9)O_(33))_(2)]^(10-)(化合物1),并首次将其用于电催化水氧化体系中进行催化产氧。化合物1不仅在pH值为4.2的酸性环境下具有产氧活性,而且展现出优异的稳定性。同时利用循环伏安、恒电压电解、扫描电镜、能量色散X射线谱等考察了化合物1在电催化过程中和对应简单金属盐(CuCl_(2))在催化行为和催化能力上的区别,从而验证了化合物1在参与的电催化体系中是真正的产氧活性物种。

A copper containing polyoxometalate(POM)[Cu_(5)(OH)_(4)(H_(2)O)_(2)(A-a-SiW_(9)O_(33))_(2)]^(10-)(compound1)was synthesized and characterized.Compound 1 was tested as the first catalyst for O_(2) production via electrocatalytic water oxidation.Meanwhile,compound 1 shows oxygen evolution activity and excellent stability in an acidic medium(pH=4.2).Multiple experiments including cyclic voltammetry,bulk water electrolysis,scanning electron microscope and energy-dispersive X-ray spectrometry measurements results confirm that the difference of the catalytic water oxidation activity and catalytic behavior using compound 1 and CuCl_(2) is compelling evidence that compound 1 is a true active species in the electrocatalytic system.