Authors Wang, Z. ; Wang, G. ; Qi, H. ; Wang, M. ; Wang, M. ; Park, S. ; Wang, H. ; Yu, M. ; Kaiser, U. ; Fery, A. ; Zhou, S. ; Dong, R. ; Feng, X.
Title Ultrathin two-dimensional conjugated metal–organic framework single-crystalline nanosheets enabled by surfactant-assisted synthesis
Date 09.11.2020
Number 58965
Abstract Two-dimensional conjugated metal–organic frameworks (2D c-MOFs) have recently emerged for potential applications in (opto-)electronics, chemiresistive sensing, and energy storage and conversion, due to their excellent electrical conductivity, abundant active sites, and intrinsic porous structures. However, developing ultrathin 2D c-MOF nanosheets (NSs) for facile solution processing and integration into devices remains a great challenge, mostly due to unscalable synthesis, low yield, limited lateral size and low crystallinity. Here, we report a surfactant-assisted solution synthesis toward ultrathin 2D c-MOF NSs, including HHB-Cu (HHB = hexahydroxybenzene), HHB-Ni and HHTP-Cu (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene). For the first time, we achieve single-crystalline HHB-Cu(Ni) NSs featured with a thickness of 4–5 nm (~8–10 layers) and a lateral size of 0.25–0.65 µm2, as well as single-crystalline HHTP-Cu NSs with a thickness of ~5.1 ± 2.6 nm (~10 layers) and a lateral size of 0.002–0.02 µm2. Benefiting from the ultrathin feature, the synthetic NSs allow fast ion diffusion and high utilization of active sites. As a proof of concept, when serving as a cathode material for Li-ion storage, HHB-Cu NSs deliver a remarkable rate capability (charge within 3 min) and long-term cycling stability (90% capacity retention after 1000 cycles), superior to the corresponding bulk materials and other reported MOF cathodes.
Publisher Chemical Science
Wikidata Q105627743
Citation Chemical Science 11 (2020) 7665-7671

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