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An unprecedented polyoxometalate-encapsulated organo–metallophosphate framework as a highly efficient cocatalyst for CO2 photoreduction.
- Source :
- Journal of Materials Chemistry A; 2/21/2022, Vol. 10 Issue 7, p3469-3477, 9p
- Publication Year :
- 2022
-
Abstract
- The photocatalytic reduction of CO<subscript>2</subscript> to chemical fuels is attractive for addressing both the greenhouse effect and the energy crisis, but the key challenge is the design and synthesis of photocatalysts with remarkable performance under visible-light irradiation. Herein, we present two novel polyoxometalate-based organo–metallophosphate frameworks (POMPOs), formulated as [Zn<subscript>4</subscript>(PO<subscript>4</subscript>)(C<subscript>7</subscript>H<subscript>8</subscript>N<subscript>4</subscript>)<subscript>6</subscript>][BW<subscript>12</subscript>O<subscript>40</subscript>]·2H<subscript>2</subscript>O (1) and [Co<subscript>4</subscript>(PO<subscript>4</subscript>)(C<subscript>7</subscript>H<subscript>8</subscript>N<subscript>4</subscript>)<subscript>6</subscript>][BW<subscript>12</subscript>O<subscript>40</subscript>]·1.5H<subscript>2</subscript>O (2). According to the single crystal analysis, both compounds possess host organo–metallophosphate (OMPO) frameworks constructed with PO<subscript>4</subscript><superscript>3−</superscript> anions, with the Keggin-type polyoxometalate H<subscript>5</subscript>BW<subscript>12</subscript>O<subscript>40</subscript> (BW<subscript>12</subscript>) as a guest encapsulated in these size-matched frameworks. Due to the synergistic combination of the POMs and OMPO frameworks in the system of photocatalytic CO<subscript>2</subscript> reduction, compound 2 could act as a highly efficient cocatalyst in combination with the [Ru(bpy)<subscript>3</subscript>]Cl<subscript>2</subscript> complex. The CO generation rate over compound 2 is 10 852 μmol g<superscript>−1</superscript> h<superscript>−1</superscript> with a high selectivity of 93.4%, which is superior to that of most reported POM-based or MOF-based catalysts for CO<subscript>2</subscript> photoreduction. To our knowledge, this is the first report of OMPO frameworks functionally combined with Keggin-type POMs being extended for the photoreduction of CO<subscript>2</subscript> and this affords a new pathway for the efficient photoconversion of CO<subscript>2</subscript> to CO. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 10
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 155281883
- Full Text :
- https://doi.org/10.1039/d1ta10148j