AI Article Synopsis
- A new hierarchical microstructure was developed using graphitic-carbon-coated NiS nanoparticles on N-doped mesoporous carbon nanoflakes, leveraging a nickel-based micro-nano structure and polydopamine as a carbon source.
- The composite shows excellent Na-ion storage capabilities, maintaining a reversible charge capacity of 372 mA h g at 5 A g over 250 cycles, and 316 mA h g at 20 A g for 2000 cycles.
- The impressive performance is due to the microstructure that facilitates electrolyte accessibility, fast electron and Na ion transport, and alleviates strain from volume changes during cycling.
Article Abstract
A hierarchical microstructure constructed with graphitic-carbon-coated NiS nanoparticles anchored on N-doped mesoporous carbon nanoflakes was fabricated using a nickel-based micro-nano structure as a precursor and polydopamine as a carbon source. By optimizing the microstructure, the obtained NiS/carbon composite compounded with the thickest carbon nanoflakes delivers ultrafast and stable Na-ion storage performance, and can maintain a reversible charge capacity of 372 mA h g at a current density of 5 A g over 250 cycles, and 316 mA h g even at a current density of 20 A g for 2000 cycles. These remarkable electrochemical properties can be attributed to its hierarchical microstructure of graphitic-carbon-coated NiS particles and N-doped mesoporous carbon nanoflakes, which provide easy accessibility to the electrolyte, fast electron transport and Na diffusion, and even relieve the strain caused by the volume expansion upon cycling.
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| http://dx.doi.org/10.1039/d1nr05539a | DOI Listing |
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