|کد مقاله||سال انتشار||مقاله انگلیسی||ترجمه فارسی||تعداد کلمات|
|150608||2018||8 صفحه PDF||سفارش دهید||5390 کلمه|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Journal of Power Sources, Volume 377, 15 February 2018, Pages 44-51
Two novel and isostructural Ni-based MOFs with topological symbol of 422Â·54Â·62, namely [Ni2(TATB)2(L)2(H2O)], have successfully synthesized, where L is the flexibly N-donor bid (1,10-bisimidazoledecane) or btd (1,10-bistriazoledecane) linker and TATB is the deprotonation mode from 4,4â²,4â³-s-triazine-2,4,6-triyl-tribenzoic acid (H3TATB). Two types of left- and right-handed helical channels with mean diameter of 11Â Ã results in large void space in 3D network. When directly use as electrode materials, the as-synthesized Ni-MOFs single-crystal electrodes behave as pseudo-capacitor and deliver high gravimetric capacitance with superior energy deliverable ability and cycling stability. For example, the maximum gravimetric capacitance is 705Â FÂ gâ1 with the energy density of 29.6Â Wh kgâ1 at a current density of 1Â AÂ gâ1. Even after 5000 continuous cycles, the capacitance retention maintains at 92.1%. The good electrochemical performance should be ascribed to the 1D helical channels facilitating the diffusion of OHâ. Furthermore, the low bulk solution (0.46 and 0.50Â Î©) and charge-transfer resistances accelerate the contact between OHâ and active species in the electrode, and consequently result in efficiency Faradaic reaction. This work opens a new way for the directly application of 3D topological MOFs single-crystal with novel interior structures especially porous and channel-like architectures in electronic energy storage field.