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Fabrication and Electrochemical Performance of Polyoxometalate-Based Three-Dimensional Metal Organic Frameworks Containing Carbene Nanocages

Sha, Jing-Quan, Yang, Xi-Ya, Chen, Yanyan, Zhu, Pei-Pei, Song, Yu-Fei, Jiang, Jianzhuang
ACS applied materials & interfaces 2018 v.10 no.19 pp. 16660-16665
anodes, carbenes, carbon nanotubes, coordination polymers, electrical conductivity, electrochemistry, lithium batteries
Two new polyoxometalate (POM)-based three-dimensional metal organic carbene frameworks, [Ag₁₀(trz)₄(H₂O)₂][HPW₁₂O₄₀] (POMs@MCNCs-1) and [Ag₁₀(trz)₄(H₂O)₆][H₂SiW₁₂O₄₀] (POMs@MCNCs-2), were hydrothermally synthesized, in which Keggin-type polyoxoanions as templates induce the formation of two different kinds of metal–carbene nanocages (MCNCs) for the first time. Combination of the reversible multielectron redox behavior and electron storage functions of POMs with the good electrical conductivity of the single-walled carbon nanotubes (SWNTs) renders the POMs@MCNCs-1/SWNT composite excellent electrochemical performance and good stability as anode materials of lithium-ion batteries, with up to 2000 mA h g–¹ for the first discharge capacity and ca. 859 mA h g–¹ for the second cycle at a current density of 100 mA g–¹. The successful fabrication of unprecedented MCNCs into the POM-based three-dimensional metal–organic frameworks in the present work must initiate extensive research interests in diverse fields.