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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE

卷号：4

期号：41

页面范围：16219-16224

ISSN号：2050-7488

摘要：To efficiently realize high sulfur content on a carbon host is of vital importance to boost the performance of Li-S batteries. In this work, a dual-oxidation strategy of H2S is designed to synthesize graphene/sulfur composites with a sulfur content as high as 80 wt%. In particular, H2S is bubbled into the aqueous dispersion of graphene oxide (GO) containing H2O2, during which sulfur is generated through the dual oxidation of H2S by H2O2 and GO. Interestingly, the as-formed sulfur is amorphous and strongly anchored on the graphene nanosheets. Benefiting from the structural merits, the graphene/sulfur nanocomposite affords a high specific capacity of 680 mA h g(-1) based on the total mass of the nanocomposite at a current density of 0.2 A g(-1) and good cycle performance with 85% of capacity retained at 0.5, 1.0 and 5.0 A g(-1) after 100 cycles. Besides efficiently producing a high-performance cathode for Li-S batteries, the method developed here also offers great promise for pollutant control.