A hybrid borotungstate-coated metal-organic framework with supercapacitance, photocatalytic dye degradation and HO sensing properties

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 51; no. 19; pp. 7613 - 7621
• Main Authors: Yu, Liang, Ning, Kang, Chunmei, Wang, Kai, Yu, Jinghua, Lv, Chunxiao, Wang, Baibin, Zhou
• Format: Journal Article
• Published: 17.05.2022
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d2dt00976e

The compounding of polyoxometalates (POMs) with structurally well-defined and porous metal-organic frameworks (MOFs) has become a hot research topic. Here, a core-shell type hybrid, {Ag 5 BW 12 O 40 }@[Ag 3 (μ-Hbtc)(μ-H 2 btc)] n (called {Ag 5 BW 12 O 40 }@Ag-BTC-2, where BTC = 1,3,5-benzyl carboxylic acid), was successfully prepared via a simple grinding method. IR, XRD, SEM, TEM, and XPS analysis was used to confirm the structure. The specific capacitance is 179.1 F g −1 when the current density is 1 A g −1 , using nickel foam as the collector, and the capacitance retention is 97.4% after 5000 cycles. The resulting aqueous-based symmetric supercapacitor has a power density of 496 W kg −1 and an energy density of 12.4 W h kg −1 . In addition, the degradation rates using {Ag 5 BW 12 O 40 }@Ag-BTC-2 toward methylene blue (MB), rhodamine B (RhB), and methyl orange (MO) exceeded 90% in 140 min and remained essentially unchanged over five replicate experiments, showing high photocatalytic activity. Meanwhile, when {Ag 5 BW 12 O 40 }@Ag-BTC-2 acts as a H 2 O 2 biosensor, it has a low detection limit (0.19 μM), a wide linear range (0.4 μM-0.27 mM) and high anti-interference properties. This shows that the synthesis of POMOFs via a grinding method is an effective strategy to improve the performance. Borotungstate-coated metal-organic framework hybrids were synthesized via a simple grinding method, and the optimum material showed good supercapacitor, photocatalytic dye degradation, and H 2 O 2 sensing performance.