Ni3P2W18O62-Ni3(BTC)2 composite of Ni3P2W18O62 coated on the surface of the Ni3(BTC)2 with supercapacitor and H2O2 sensing properties was prepared by simple grinding strategy

• Published in: Electrochimica acta 2023-10, Vol.466, p.143028, Article 143028
• Main Authors: Xu, Lijie, Di, Shan, Lin, Hong, Wang, Chunxiao, Wang, Chunmei, Yu, Kai, Lv, Jinghua, Zhou, Baibin
• Format: Article
• Language: English
• Subjects: 1,3,5-benzene-tricarboxylic acid; Metal-organic framework; Polyoxometalates; Sensing; Supercapacitor
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2023.143028

•Ni3P2W18O62-Ni3(BTC)2 was prepared by grinding strategy with high repeatability and yield.•The Cs of the Ni3P2W18O62-Ni3(BTC)2-NF is 460 F g−1 at the current density of 1 A g−1.•The energy density of SSC is 28.6 Wh kg−1 with a power density of 600 W kg−1.•Ni3P2W18O62-Ni3(BTC)2 as a sensor has a low detection limit of 0.17 μM. Polyoxometalate-based metal-organic frameworks (POMOFs) as energy and catalytic materials have attracted considerable attention. Hence, Ni3P2W18O62-Ni3(BTC)2 (BTC=1,3,5-benzene-tricarboxylic acid) composite was successfully synthesized by a simple grinding strategy. IR, XRD, SEM, TEM and HRTEM results show that Ni3P2W18O62 is successfully coated on the surface of the Ni3(BTC)2. The specific capacitance of Ni3P2W18O62-Ni3(BTC)2 (460 F g−1 at 1 A g−1) is higher than that of precursors and reported supercapacitors when nickel foam is used as a collector. And the stability of Ni3P2W18O62-Ni3(BTC)2 is excellent after 5000 cycles. The symmetrical supercapacitor (SSC) was assembled with the Ni3P2W18O62-Ni3(BTC)2 as the electrode material and the energy density can reach 28.6 Wh kg−1 with a power density of 600 W kg−1. Ni3P2W18O62-Ni3(BTC)2 as a H2O2 sensor not only has a wide linear range (0.5 μM to 0.25 mM) and a low detection limit (0.17 μM), but also has strong stability and anti-interference ability, and can be used to detect H2O2 in real blood serum specimens. The improved capacitance and sensing properties are mainly attributed to the increased active site and faster electron/charge migration rate of the Ni3P2W18O62-Ni3(BTC)2. This study overcomes the shortcomings of traditional synthesis methods and provides new ideas for their application in electrochemistry. [Display omitted]