A novel polyoxometalate-based metal-organic compound constructed from an unprecedented [Ag8(Hpyttz)4(H2pyttz)2] cluster and an in-situ [VW12O40]3− anion

Wang, Xiuli; Chen, Lufei; Liu, Guocheng; Luan, Jian; Cao, Jingjing; Gong, Chunhua; Chang, Zhihan

doi:10.1016/j.inoche.2015.01.022

Cited by 8 publications

(9 citation statements)

References 25 publications

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“…The VW 12 polyoxoanion exhibits the well-known α-Keggin structure. The central V atom is discrete, and it is surrounded by eight O atoms with an occupancy of one-half each, forming a cube of eight O atoms due to the presence of an inversion center on the V atom, which is similar to previous reports. ,, The V–O and W–O bond lengths are in the range 1.46(2) to 1.56(3) Å and 1.65(14) to 2.53(2) Å, respectively, which is within the normal range for these bonds. − There are six crystallographically independent Ag + cations (Ag1 to Ag6) and four crystallographically independent trz – anions. A summary of the coordination modes of the Ag + cations and the trz – ligands is illustrated in Figure S2.…”

Section: Resultssupporting

confidence: 83%

“…These redox reactions of POMs correspond to the one, one, and two electron redox processes of W centers in a VW 12 subunit (α-VW 12 O 40 3– + e – = α-VW 12 O 40 4– , α-VW 12 O 40 4– + e – = α-VW 12 O 40 5– , and α-VW 12 O 40 5– + 2e – + H + = α-HVW 12 O 40 6– ), respectively. In addition, there is one irreversible anodic peak (II) at +0.163 V, which is attributed to the one-electron V(V)/V(IV) reduction . As the scan rate increases, the positions of the anodic peaks shift to lower values, probably due to the internal resistance and the electrode polarization .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, there is one irreversible anodic peak (II) at +0.163 V, which is attributed to the one-electron V(V)/V(IV) reduction. 47 As the scan rate increases, the positions of the anodic peaks shift to lower values, probably due to the internal resistance and the electrode polarization. 54 The 2-based electrode displays four pairs of reversible redox peaks in the potential range from −0.6 ), 45 respectively.…”

Section: Inorganic Chemistrymentioning

confidence: 99%

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Polyoxometalate Metal–Organic Frameworks: Keggin Clusters Encapsulated into Silver-Triazole Nanocages and Open Frameworks with Supercapacitor Performance

et al. 2019

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To investigate the relationship between the structures of polyoxometalate host–guest materials and their energy-storage performance, three novel polyoxometalate-based metal–organic compounds, [Ag10(C2H2N3)8][HVW12O40], [Ag10(C2H2N3)6][SiW12O40], and [Ag(C2H2N3)][Ag12(C2H2N3)9][H2BW12O40] are synthesized by a one-step hydrothermal method and further confirmed by single-crystal X-ray diffraction analyses and other numerous characterization techniques. In compound [Ag10(C2H2N3)8][HVW12O40], the Keggin clusters are intersected into channels formed by a 3D open metal–organic framework. In contrast, in compounds [Ag10(C2H2N3)6][SiW12O40] and [Ag(C2H2N3)][Ag12(C2H2N3)9][H2BW12O40], the Keggin clusters are encapsulated into silver-triazole metal–organic nanocages to construct core–shell structures, which are further fused together by covalent bonds to form 3D polyoxometalate-based metal–organic frameworks. The electrochemical properties of three compound-based electrodes are estimated by cyclic voltammetry, galvanostatic charge–discharge, electrochemically active surface area, and electrochemical impedance spectroscopy. The results of the electrochemical performance tests indicate that these compounds possess high specific capacitance and cycling stability, especially [Ag10(C2H2N3)8][HVW12O40], showing a specific capacitance of 93.5 F g–1, which is higher than that of many other polyoxometalate-based electrode materials. A possible mechanism of the electrochemical performance is explored, which is mainly related to the redox capacity of polyoxometalate, the electrochemically active surface area, the electrochemical impedance spectroscopy, and the microstructures of polyoxometalate-based metal–organic frameworks.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Inorganic Chemistrymentioning

confidence: 99%

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Polyoxometalate Metal–Organic Frameworks: Keggin Clusters Encapsulated into Silver-Triazole Nanocages and Open Frameworks with Supercapacitor Performance

et al. 2019

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“…The Ag2 cation is unique in that it coordinates with three carbon atoms from three different trz ligands through Ag + –π interactions (Figure S2). The bond and interaction lengths around the Ag ions are 2.76(8), 2.19(4), and 2.19(4) Å for Ag–O and Ag–N bonds, as well as Ag + –π interactions, respectively, which is consistent with the reported Ag-containing compounds. , Therefore, each trz group coordinates with four Ag + ions through two Ag–N bonds and two Ag + –π interactions (Figure S2).…”

Section: Resultssupporting

confidence: 86%

“…interactions, respectively, which is consistent with the reported Ag-containing compounds. 57,58 Therefore, each trz group coordinates with four Ag + ions through two Ag−N bonds and two Ag + −π interactions (Figure S2).…”

Section: ■ Introductionmentioning

confidence: 99%

Polyoxometalate-Incorporated Metallacalixarene@Graphene Composite Electrodes for High-Performance Supercapacitors

Hou

Chai

et al. 2019

ACS Appl. Mater. Interfaces

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Composites of polyoxometalate (POM)/metallacalixarene/graphene-based electrode materials not only integrate the superiority of the individual components perfectly but also ameliorate the demerits to some extent, providing a promising route to approach high-performance supercapacitors. Herein, first, we report the preparations, structures, and electrochemical performance of two fascinating POM-incorporated metallacalixarene compounds [Ag5(C2H2N3)6][H5 ⊂ SiMo12O40] (1) and [Ag5(C2H2N3)6][H5 ⊂ SiW12O40] (2); (C2H2N3 = 1H-1,2,4-triazole). Single-crystal X-ray diffraction analyses illustrated that both 1 and 2 possess intriguing POM-sandwiched metallacalix[6]arene frameworks. Nevertheless, our investigations, including the electrochemical cyclic voltammetry, galvanostatic charge–discharge tests, and electrochemical impedance spectroscopy, reveal that the oxidation ability of the Keggin ions is a primary effect in electrochemical performance of these POM-incorporated metallacalixarene compounds. Namely, the electrodes containing Mo as metal atoms in the Keggin POM shows much higher capacitance than the corresponding W-containing ones. Moreover, compound 1@graphene oxide (GO) composite electrodes are fabricated and systematically explored for their supercapacitor performance. Thanks to the synergetic effects of GO and POM-incorporated metallacalixarenes, the compound 1@15%GO-based electrode exhibits the highest specific capacitance of up to 230.2 F g–1 (current density equal to 0.5 A g–1), which is superior to majority of the reported POM-based electrode materials.

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A new POMOF consisting of [VW 12 ] 4− clusters and metal-organic nanotubes: Synthesis, structure, electrocatalytic and luminescent properties

Zhao

et al. 2016

Inorganic Chemistry Communications

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A novel polyoxometalate-based metal-organic compound constructed from an unprecedented [Ag8(Hpyttz)4(H2pyttz)2] cluster and an in-situ [VW12O40]3− anion

Cited by 8 publications

References 25 publications

Polyoxometalate Metal–Organic Frameworks: Keggin Clusters Encapsulated into Silver-Triazole Nanocages and Open Frameworks with Supercapacitor Performance

Polyoxometalate Metal–Organic Frameworks: Keggin Clusters Encapsulated into Silver-Triazole Nanocages and Open Frameworks with Supercapacitor Performance

Polyoxometalate-Incorporated Metallacalixarene@Graphene Composite Electrodes for High-Performance Supercapacitors

A new POMOF consisting of [VW 12 ] 4− clusters and metal-organic nanotubes: Synthesis, structure, electrocatalytic and luminescent properties

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