A series of polyoxometalate compounds by tuning N sites and numbers of ligands: syntheses, characterization and electrochemical sensing, and photocatalytic and supercapacitor properties

Jin, Liang; Ying, Jun; Zhang, Yanping; Sun, Chenxi; Tian, Aixiang; Wang, Xiuli

doi:10.1039/d2nj00674j

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…According to the figure, when {P 2 W 18 }@Co-BTC-GCE was used as the electrochemical sensor to detect H 2 O 2 , the linear equations were I(μA) = −106.806–61.114 C(mM) and R 2 = 0.995 and the detection limit was 0.633 μM (S/N = 3). The sensitivity was 8.65 mA mM −1 cm −2 and the total linear range was 1.9 μM~1.67 mM, superior to literature reports [ 76 , 77 , 78 , 79 ]. The linear range may be due to the large specific surface area and porosity of the POMOF core–shell structure, which facilitates the homogeneous dispersion of precursors and the transfer of electrons to the internal structure, thereby improving the reaction kinetics on the surface of the electrode material [ 80 ].…”

Section: Resultsmentioning

confidence: 50%

Nanomaterial with Core–Shell Structure Composed of {P2W18O62} and Cobalt Homobenzotrizoate for Supercapacitors and H2O2-Sensing Applications

Zhang

Lin

et al. 2023

Nanomaterials

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Designing and preparing dual-functional Dawson-type polyoxometalate-based metal–organic framework (POMOF) energy storage materials is challenging. Here, the Dawson-type POMOF nanomaterial with the molecular formula CoK4[P2W18O62]@Co3(btc)2 (abbreviated as {P2W18}@Co-BTC, H3btc = 1,3,5-benzylcarboxylic acid) was prepared using a solid-phase grinding method. XRD, SEM, TEM et al. analyses prove that this nanomaterial has a core–shell structure of Co-BTC wrapping around the {P2W18}. In the three-electrode system, it was found that {P2W18}@Co-BTC has the best supercapacitance performance, with a specific capacitance of 490.7 F g−1 (1 A g−1) and good stability, compared to nanomaterials synthesized with different feedstock ratios and two precursors. In the symmetrical double-electrode system, both the power density (800.00 W kg−1) and the energy density (11.36 Wh kg−1) are greater. In addition, as the electrode material for the H2O2 sensor, {P2W18}@Co-BTC also exhibits a better H2O2-sensing performance, such as a wide linear range (1.9 μM–1.67 mM), low detection limit (0.633 μM), high selectivity, stability (92.4%) and high recovery for the detection of H2O2 in human serum samples. This study provides a new strategy for the development of Dawson-type POMOF nanomaterial compounds.

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