A novel approach to effectively suppress the “polysulfide shuttle” in Li–S batteries is presented by designing a freestanding, three-dimensional graphene/1T MoS₂ (3DG/TM) heterostructure with highly efficient electrocatalysis properties for lithium polysulfides (LiPSs). The 3DG/TM heterostructure is constructed by few-layered graphene nanosheets sandwiched by hydrophilic, metallic, few-layered 1T MoS₂ nanosheets with abundant active sites. The porous 3D structure and the hydrophilic feature of 1T-MoS₂ are beneficial for electrolyte penetration and Li-ion transfer, and the high conductivities of both graphene and the 1T MoS₂ nanosheets facilitate electron transfer. These merits lead to a high electrocatalytic efficiency for LiPSs due to excellent ion/electron transfer and the presence of sufficient electrocatalytic active sites. Therefore, the cells with 3DG/TM exhibit outstanding electrochemical performance, with a high reversible discharge capacity of 1181 mA h g⁻¹ and a capacity retention of 96.3% after 200 cycles. The electrocatalysis mechanism of LiPSs is further experimentally and theoretically revealed, which provides new insights and opportunities to develop advanced Li–S batteries with highly efficient electrocatalysts for LiPS conversion.

中文翻译：

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独立的1T MoS ₂ /石墨烯异质结构作为Li–S电池中多硫化锂的高效电催化剂†

通过设计一种独立的三维石墨烯/ 1T MoS ₂（3DG / TM）异质结构，该结构具有高效的多硫化锂（LiPSs）电催化性能，提出了一种有效抑制Li-S电池中“多硫化物穿梭”的新方法。3DG / TM异质结构由夹在亲水性，金属性，层数少的具有丰富活性位点的1T MoS ₂纳米片夹在中间的层数少的石墨烯纳米片构成。1T-MoS ₂的多孔3D结构和亲水特性有利于电解质渗透和锂离子转移，以及石墨烯和1T MoS ₂的高电导率纳米片促进电子转移。由于优异的离子/电子转移和足够的电催化活性位，这些优点导致了LiPS的高电催化效率。因此，具有3DG / TM的电池表现出优异的电化学性能，在200个循环后具有1181mA hg ^-1的高可逆放电容量和96.3％的容量保持率。LiPSs的电催化机理在实验和理论上得到了进一步揭示，这为开发高级Li-S电池和高效的LiPS转化电催化剂提供了新的见识和机会。