Electrocatalytic water oxidation beginning with the cobalt polyoxometalate [Co4(H2O)2(PW9O34)2]10-: identification of heterogeneous CoOx as the dominant catalyst |
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Authors: | Stracke Jordan J Finke Richard G |
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Institution: | Chemistry Department, Colorado State University, Fort Collins, Colorado 80523, United States. |
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Abstract: | The question of "what is the true catalyst?" when beginning with the cobalt polyoxometalate (POM) Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-) in electrochemical water oxidation catalysis is examined in pH 8.0 sodium phosphate buffer at a glassy carbon electrode. Is Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-) a true water oxidation catalyst (WOC), or just a precatalyst? Electrochemical, kinetic, UV-vis, SEM, EDX, and other data provide four main lines of compelling evidence that, under the conditions used herein, the dominant WOC is actually heterogeneous CoO(x) and not homogeneous Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-). |
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