期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 30, 页码 25239-25249出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04432
关键词
green and template-free synthesis; monoclinic ZIF-8 nanosheets; two-dimensional hierarchically carbon; superior electron conductivity; lithium-sulfur batteries
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09040101]
2D hierarchically porous carbon (2D-HPC) nanosheets with unique advantages are highly desired as host materials for lithium sulfur (Li-S) batteries and other energy storage devices. Herein, we propose a self-template and organic solvent-free approach to synthesize nanosheets of monoclinic ZIF-8 at room temperature from which 2D-HPC nanosheets (ZIF-8 nanosheets carbon denoted as ZIF-8-NS-C) are derived to be an efficient sulfur immobilizer for Li-S batteries for the first time. The anisotropic nanosheets are believed to relate to the symmetry of the monoclinic structure. The 2D ZIF-8-NS-C nanosheets with embedded hierarchical pores construct an effective conductive network through plane-to-plane modes to endow superior electron transfer and fast electro-chemical kinetics. Moreover, the nitrogen-rich feature of ZIF-8-NS-C can increase the affinity/interaction of carbon host with lithium polysulfides, favoring the cyclic performance. The sulfur/ZIF-8-NS-C (S/ZIF-8-NS-C) cathode shows a superior rate capability with high capacities of 1226 mA h g(-1) at 0.2 C and 785 mA h g(-1) at 2 C, and a sustainable cycling stability with a capacity attenuation of 0.12% per cycle at proposed here pioneers the controllable design of MOF-based structures to inspire the derived porous materials for energy storage applications.
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