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A Hexadecanuclear Cobalt-Added Tungstogermanate Containing Counter Cobalt Hydrates: Synthesis, Structure and Photocatalytic Properties.

ABSTRACT: The synthesis and exploration of the properties of structurally-new polyoxometalates (POMs) has been attracting considerable research interest. In this work, a hexadecanuclear cobalt-added tungstogermanate, H31(NH4)5Na16{CoⅢ(H2O)6}4{[CoⅡ4(μ3-OH)3(PO4)]4(A-α-GeW9O34)4}2·23-H2O (1), was synthesized under hydrothermal conditions and characterized by various techniques. Compound 1 can effectively drive the heterogeneous photocatalytic hydrogen evolution reaction in the presence of [Ir(ppy)2(dtbbpy)][PF6] as the photosensitizer, with triethanolamine (TEOA) and N-Hydroxy succinimide (NHS) used as the dual sacrificial reagents. Control experiments revealed the important role of NHS in enhancing the hydrogen-evolution activities. Under optimal catalytic conditions, a hydrogen yield of 54.21 μmol was achieved after 10-h photocatalysis, corresponding to a hydrogen evolution rate of 1807.07 μmol·g-1·h-1. Stability studies demonstrated that catalyst 1 can be isolated and reused for three successive photocatalytic cycles with negligible decline of the H2 yield, indicating the stability and recycling robustness of catalyst 1.

SUBMITTER: Zhao Q 

PROVIDER: S-EPMC10343794 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature

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A Hexadecanuclear Cobalt-Added Tungstogermanate Containing Counter Cobalt Hydrates: Synthesis, Structure and Photocatalytic Properties.

Zhao Qing Q   Li Xuyan X   Wang Yu Y   Lv Hongjin H   Yang Guoyu G  

Nanomaterials (Basel, Switzerland) 20230705 13

The synthesis and exploration of the properties of structurally-new polyoxometalates (POMs) has been attracting considerable research interest. In this work, a hexadecanuclear cobalt-added tungstogermanate, H<sub>31</sub>(NH<sub>4</sub>)<sub>5</sub>Na<sub>16</sub>{Co<sup>Ⅲ</sup>(H<sub>2</sub>O)<sub>6</sub>}<sub>4</sub>{[Co<sup>Ⅱ</sup><sub>4</sub>(μ<sub>3</sub>-OH)<sub>3</sub>(PO<sub>4</sub>)]<sub>4</sub>(A-<i>α</i>-GeW<sub>9</sub>O<sub>34</sub>)<sub>4</sub>}<sub>2</sub>·23-H<sub>2</sub>O (<b>1</  ...[more]

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