Journal Article

Nanomaterial with Core–Shell Structure Composed of Psub.2Wsub.18Osub.62 and Cobalt Homobenzotrizoate for Supercapacitors and Hsub.2Osub.2-Sensing Applications

Zhang, Lanyue, Lin, Hong, Wang, Chunmei, Di, Shan, Wang, Chunxiao, Zhou, Baibin, Yu, Kai, Lv, Jinghua

2023

Overview

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 CoK[sub.4][P[sub.2]W[sub.18]O[sub.62]]@Co[sub.3](btc)[sub.2] (abbreviated as P[sub.2]W[sub.18]@Co-BTC, H[sub.3]btc = 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 P[sub.2]W[sub.18]. In the three-electrode system, it was found that P[sub.2]W[sub.18]@Co-BTC has the best supercapacitance performance, with a specific capacitance of 490.7 F g[sup.−1] (1 A g[sup.−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[sup.−1]) and the energy density (11.36 Wh kg[sup.−1]) are greater. In addition, as the electrode material for the H[sub.2]O[sub.2] sensor, P[sub.2]W[sub.18]@Co-BTC also exhibits a better H[sub.2]O[sub.2]-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 H[sub.2]O[sub.2] in human serum samples. This study provides a new strategy for the development of Dawson-type POMOF nanomaterial compounds.

• Publisher: MDPI AG
• Subject: Capacitors