Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 654, Issue -, Pages 1393-1404Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.10.136
Keywords
Anderson-type polyoxometalates; 13,5-benzylcarboxylic acid; Supercapacitor; Hydrogen evolution reaction; Oxygen evolution reaction
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Enhancing performance through the combination of polyoxometalates clusters with metal-organic frameworks is a challenging task. In this study, a polyoxometalate-based metal-organic framework named HRBNU-5 was synthesized and it exhibited high specific capacitance and stability. Additionally, it showed excellent performance in supercapacitors and catalytic reactions.
Enhancing performance through the combination of polyoxometalates (POMs) clusters with metal-organic frameworks (MOFs) that contain various transition metals is a challenging task. In this study, we synthesized a polyoxometalate-based metal-organic framework (POMOF) named HRBNU-5 using a solvothermal method. HRBNU-5 is composed of Zn[N(C4H9)4][MnMo6O18{(OCH2)3CNH2}2]@Zn3(C9H3O6)2Greek ano teleia6C3H7NO, which includes two components: Zn[N(C4H9)4][MnMo6O18{(OCH2)3CNH2}2]Greek ano teleia3C3H7NO ({Zn[MnMo6]}) and Zn3(C9H3O6)2Greek ano teleia3C3H7NO (Zn-BTC). Structural characterization confirmed the host-guest structure, with Zn-BTC encapsulating {Zn[MnMo6]}. In a three-electrode system, HRBNU-5 exhibited a specific capacitance of 851.3 F g-1 at a current density of 1 A/g and retained high stability (97.2 %) after 5000 cycles. Additionally, HRBNU-5 performed well in aqueous-symmetric/asymmetric supercapacitors (SSC/ASC) in terms of energy density and power density in a double-electrode system. Moreover, it demonstrated excellent catalytic performance in a 1.0 M KOH solution, with low overpotentials and Tafel slopes for hydrogen and oxygen evolution reactions: 177.1 mV (110 HER), 126.9 mV dec-1 and 370.3 mV (150 OER), 36.3 mV dec-1, respectively, surpassing its precursors and most reported studies. HRBNU-5 ' s positive performance is attributed to its host-guest structure, high electron-transfer conductivity, and porous structure that enhances efficient mass transport. This work inspires the design of Anderson-type POMOF electrode materials with multiple active sites and a well-defined structure.
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