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Copper leads to a breakup: simple Cu(II) salts are shown to be highly reactive as water oxidation electrocatalysts in neutral to weakly basic aqueous buffer solutions of CO(2)/HCO(3)(-)/CO(3)(2-) or HPO(4)(2-)/PO(4)(3-). Coordination to the buffer anions under these conditions prevents the precipitation of Cu(OH)(2), CuCO(3), or Cu(3)(PO(4))(2) and appears to stabilize higher oxidation states of copper.
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Chen et al. (2012) studied this question.
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