Simple Preparation of Ag-Btc-Modified Co 3 Mo 7 O 24 Mesoporous Material For Capacitance, Photocatalysis, and H2o2-Sensing Performances

Injecting polyoxometalates (POMs) clusters into the metal organic frameworks (MOFs) can not only provide more additional redox centers, but also solve the problems of easy agglomeration and low stability of POMs. Herein, we prepared {Co 3 Mo 7 O 24 }@[Ag 4 (μ-Hbtc)(μ-H 2 btc)] 1/2 (abbreviated as {Co 3 Mo 7 O 24 }@Ag-BTC, BTC=1,3,5-benzylcarboxylic acid) by simple grinding method and characterized its morphology and composition. The compound is a mesoporous material with an aperture of 6.5 nm, it had high specific capacitance (260.7 F g -1 ) and high cycle stability (99.8% after 5000 cycles) in the nickel foam (NF) three-electrode system. In the assembled symmetrical supercapacitor, its maximum energy density ( E max ) was 4.9 Wh Kg -1 and the power density was 355.1 W Kg -1 , the stability was up to 97.6% after 5000 cycles. The electrochemical sensing performance of hydrogen peroxide was studied based on this material with a linear range of 7 μM-0.43 mM, a signal-to-noise ratio (S/N) of 3, and a detection limit of 0.61 μM. The material was also used as a degradation agent to test the photocatalytic performance against three different dyes, the degradation rates of MB and RhB were both higher than 94%, and had high stability after five cycles. The synthesis of this material opens up a new way to prepare composite active materials with multiple properties.