Issue 29, 2018

Metal–organic frameworks derived hollow NiS2 spheres encased in graphene layers for enhanced sodium-ion storage

Abstract

Nickel disulfide (NiS2) is a promising anode material for sodium-ion batteries (SIBs). Due to the volume expansion issue and intrinsic low conductivity, conventional NiS2-based anodes exhibit unsatisfactory Na+ storage performance far below their high theoretical specific capacity. Here, hollow NiS2 microspheres assembled from small NiS2 nanoparticles embedded in graphene layers (hollow NiS2@G) were successfully prepared by one-step annealing of Ni-MOFs involving simultaneous carbonization and sulfidation. Benefitting from the hollow and porous structure, highly graphitized carbon protective layers and large mass loading of NiS2, the as-prepared hollow NiS2@G is developed as a high-performance anode for SIBs, and delivers an increased capacity of 848 mA h g−1 at 0.1 A g−1 after 100 cycles and an excellent rate capability of 527.8 mA h g−1 at 2 A g−1. The comprehensive material characterization and electrochemical investigations demonstrate the one-step calcination as a simple and effective strategy in fabricating MOFs-derived nanocomposites for energy storage and conversion.

Graphical abstract: Metal–organic frameworks derived hollow NiS2 spheres encased in graphene layers for enhanced sodium-ion storage

Supplementary files

Article information

Article type
Communication
Submitted
11 Jun 2018
Accepted
02 Jul 2018
First published
02 Jul 2018

J. Mater. Chem. A, 2018,6, 14077-14082

Metal–organic frameworks derived hollow NiS2 spheres encased in graphene layers for enhanced sodium-ion storage

R. Bi, C. Zeng, H. Huang, X. Wang and L. Zhang, J. Mater. Chem. A, 2018, 6, 14077 DOI: 10.1039/C8TA05554H

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