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3D Ordered Macroporous Metal-organic-frameworks (MOFs) Single Crystals Derived Nitrogen-doped Hierarchical Porous Carbon for High Performance Potassium-ion Batteries.

08:00 EDT 12th July 2019 | BioPortfolio

Summary of "3D Ordered Macroporous Metal-organic-frameworks (MOFs) Single Crystals Derived Nitrogen-doped Hierarchical Porous Carbon for High Performance Potassium-ion Batteries."

The biggest challenge of potassium-ion batteries (KIBs) application is to develop high performance electrode materials for accommodating the large-size potassium ions. Herein, by rational design, we carbonize three-dimensional (3D) order macroporous ZIF-8 to fabricate 3D interconnected nitrogen doped hierarchical porous carbon (N-HPC) that delivers excellent rate capability (94 mAh g-1 at 10.0 A g-1), unprecedented cycle life (157 mA g-1 after 12000 cycles at 2.0 A g-1) and high reversible capacity (292 mAh g-1 at 0.1 A g-1). The 3D hierarchical porous structure reduces the diffusion distance for both ions/electrons, while N-doping improves the reactivity and electronic conductivity via producing extrinsic defects. In addition, the bicontinuous structure possesses large surface area, decreasing the current density, again improving the rate performance. In-situ Raman spectra analysis confirms that the potassiation and depotassiation in the N-HPC are highly reversible processes. The Galvanostatic intermittent titration (GITT) measurement and the first-principles calculations reveal that the interconnected macroporous are more beneficial to the diffusion of the K+. This 3D interpenetrating structure demonstrates the superiority for energy storage applications.

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This article was published in the following journal.

Name: Nano letters
ISSN: 1530-6992
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