Speciation and Dynamics in the [Co4V2W18O68]10–/Co(II)aq/CoOx Catalytic Water Oxidation System
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https://figshare.com/articles/dataset/Speciation_and_Dynamics_in_the_Co_sub_4_sub_V_sub_2_sub_W_sub_18_sub_O_sub_68_sub_sup_10_sup_Co_II_sub_aq_sub_CoO_sub_i_x_i_sub_Catalytic_Water_Oxidation_System/7381604
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Our group reported that the polyoxometalate Na10[Co4V2W18O68]·26H2O (Co4V2) is an active water oxidation catalyst and provided characterization of this system (J. Am. Chem. Soc. 2014, 136 (26), 9268). Two recent publications called into question the stability of Co4V2, one noting the miss-assignment of a 51V NMR peak (Inorg. Chem. 2016, 55 (11), 5343) and another providing additional stability studies (ACS Catal., 2017, 7 (1), 7). We report here solution studies that further clarify stability limitations in this system by locating the correct 51V NMR resonance of Co4V2 and the other V-containing species present. Furthermore, we demonstrate that the observed catalytic activity cannot be explained simply by Co(II)aq, but arises from multiple active WOC species in solution. Key points about investigating such complex equilibrating aqueous catalyst systems are addressed.
创建时间：
2018-11-26
