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Two 2D Layered P<sub>4</sub>Mo<sub>6</sub> Clusters with Potential Bifunctional Properties: Proton Conduction and CO<sub>2</sub> Photoreduction
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Citations
39
References
2020
Year
Two hourglass-type molybdophosphate hybrids with the formulas [Cd(H<sub>2</sub>O)<sub>2</sub>DABT]<sub>4</sub>[Cd(H<sub>7</sub>P<sub>4</sub>Mo<sub>6</sub>O<sub>31</sub>)<sub>2</sub>]·19H<sub>2</sub>O (<b>1</b>) and (C<sub>2</sub>H<sub>5</sub>OH)(C<sub>3</sub>H<sub>5</sub>N<sub>2</sub>)<sub>6</sub>[Co<sub>3</sub>(H<sub>6</sub>P<sub>4</sub>Mo<sub>6</sub>O<sub>31</sub>)<sub>2</sub>]·H<sub>2</sub>O (<b>2</b>) (DABT= 3,3'-diamino-5,5'-bis(1H-1,2,4-triazole)) have been successfully designed and synthesized via a hydrothermal method. Structure analysis revealed that the inorganic moieties in compounds <b>1</b> and <b>2</b> are made up of hourglass-type {M[P<sub>4</sub>Mo<sub>6</sub>]<sub>2</sub>} (M = Cd/Co) structure, which were constructed by two (P<sub>4</sub>Mo<sub>6</sub>) units with single transition metal (TM) (Cd/Co) atom as the central metal. The {M[P<sub>4</sub>Mo<sub>6</sub>]<sub>2</sub>} (M = Cd/Co) structures were then further connected by TM to constitute a 2D layered structure. Surprisingly, under the condition of 60 °C and 98% RH, compounds <b>1</b> and <b>2</b> exhibited excellent proton conductivity of 1.35 × 10<sup>-3</sup> and 3.78 × 10<sup>-3</sup> S cm<sup>-1</sup>, respectively. Furthermore, compound <b>2</b> can act as heterogeneous catalyst for CO<sub>2</sub> photoreduction, which indicates that it may be a bifunctional POM-based material with great promise.
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