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Issue 42, 2012
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A nickel containing polyoxometalate water oxidation catalyst

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Abstract

A new pentanickel silicotungstate complex, K10H2[Ni5(OH)6(OH2)3(Si2W18O66)]·34H2O (KH-1), has been synthesized and characterized by X-ray crystallography and several other methods. Dynamic light scattering, kinetics and other experiments confirm that 1 in the presence of [Ru(bpy)3]2+ (the photosensitizer for light-driven water oxidations) and [Ru(bpy)3]3+ (the oxidant in the dark water oxidations) exists in an equilibrium between solution (soluble) and a [Ru(bpy)3]n+-1 complex (minimally soluble) form. This new pentanickel polyoxometalate catalyzes efficient water oxidation in both the dark and on irradiation with 455 nm LED light with 1.0 mM [Ru(bpy)3]2+ photosensitizer and 5.0 mM Na2S2O8, sacrificial electron acceptor. Four lines of evidence indicate that 1 in this solution ⇌ Ru(bpy)3]n+-1 complex equilibrium remains molecular and does not decompose to nickel hydroxide particles.

Graphical abstract: A nickel containing polyoxometalate water oxidation catalyst

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Publication details

The article was received on 14 Feb 2012, accepted on 17 Jul 2012 and first published on 17 Jul 2012


Article type: Paper
DOI: 10.1039/C2DT30331K
Citation: Dalton Trans., 2012,41, 13043-13049

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    A nickel containing polyoxometalate water oxidation catalyst

    G. Zhu, E. N. Glass, C. Zhao, H. Lv, J. W. Vickers, Y. V. Geletii, D. G. Musaev, J. Song and C. L. Hill, Dalton Trans., 2012, 41, 13043
    DOI: 10.1039/C2DT30331K

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