Topic
Polyoxometalate
About: Polyoxometalate is a research topic. Over the lifetime, 3493 publications have been published within this topic receiving 94123 citations. The topic is also known as: POM.
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TL;DR: The study demonstrates that polyoxometalates are regenerable photoactive molecules with outstanding electron-transfer ability and the deposition of metal nanoparticles on the TiO(2)-PTA cocatalytic surface can have a dramatic effect on increasing the overall photoc atalytic performance of the composite system.
Abstract: To improve the photocatalytic efficiency of TiO2-based nanomaterials, we demonstrate a facile, generalized, highly localized reduction approach to the decoration of TiO2–polyoxometalate composites with a range of metal nanoparticles including Cu, Ag, Pt, and Au. The synthesis of nanocomposite photococatalysts reported in this study has been achieved by utilizing the unique ability of the TiO2-bound PTA (phosphotungstic acid) molecules (a polyoxometalate, POM) to act as a highly localized UV-switchable reducing agent that specifically reduces metal ions to their nanoparticulate forms directly and only onto the TiO2 surface. This leads to the metal contaminant-free synthesis of TiO2–PTA–metal nanocomposites, which is a significant advantage of the proposed approach. The study further demonstrates that polyoxometalates are regenerable photoactive molecules with outstanding electron-transfer ability and the deposition of metal nanoparticles on the TiO2–PTA cocatalytic surface can have a dramatic effect on inc...
99 citations
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98 citations
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TL;DR: The structural difference of compounds 1-5 indicates that the reaction conditions perform a crucial influence on the structures of this series, and the electrochemical properties of 2 and 5 and the SPS responses of 3-5 suggest that these compounds can be used as potential electrocatalytic or photocatalytic framework materials.
Abstract: To investigate the influence of reaction conditions on the compound structures, five polyoxometalate (POM)-supported inorganic−organic hybrid compounds, [CuI3(L1)4][PW12O40] (1), [CuI3(L1)4][PMo12O40] (2), [CuI3(L1)4][PW12O40] (3), [CuI3(L1)3][PW12O40] (4), and [CuI3(L2)3][PMo12O40] (5) [L1 = 1,4-bis(pyrazol-1-ylmethyl)benzene, L2 = 4,4′-bis(pyrazol-1-ylmethyl)biphenyl], were hydrothermally synthesized by tuning the reactant species and molar ratio and reaction temperature and were characterized by elemental analysis, IR spectroscopy, PXRD, XPS, electrochemistry, SPS, and X-ray crystallography. Compounds 1 and 2 were synthesized in the isostructural state at 150 °C, in which L1 ligands link CuI ions, generating a cationic 2D 63 (hcb) skeleton {[Cu3(L1)4]3+}n-like sheet that further connects with POM anions, forming a neutral 2D (3,4)-connected network with a Schlafli symbol of (53)2(54;82). In contrast, compound 3 was synthesized at a relatively lower reaction temperature (130 °C) than that for the synthe...
98 citations
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98 citations
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TL;DR: In this paper, the structural, thermal and textural properties of the LDH−POM intercalates were elucidated based on XRD, FTIR, TEM, EDS, and N2 adsorption−desorption studies.
Abstract: The pillaring of Mg3Al layered double hydroxides (LDHs) by the title polyoxometalates (POMs) was accomplished by ion exchange reaction of the LDH−hydroxide and −adipate precursors with the POM anion at ambient or refluxing temperatures The structural, thermal and textural properties of the LDH−POM intercalates were elucidated based on XRD, FTIR, TEM, EDS, and N2 adsorption−desorption studies A gallery height of ∼10 A was observed for the LDH intercalated by the symmetrical Keggin POM, whereas two different gallery heights were found for the cylindrical Dawson (145 and 128 A) and Finke (133 and 126 A) anions, depending on the preparation temperature The differences in POM orientations were rationalized in terms of different electrostatic and hydrogen-bonding interactions between the POM pillars and the LDH layers Upon thermal treatment at ≥100 °C, the intercalated Dawson and Finke POM ions exhibited only one gallery orientation, regardless of synthesis conditions The crystalline microporous struct
98 citations