Nickel sulfide nanocrystals on nitrogen-doped porous carbon nanotubes with high-efficiency electrocatalysis for room-temperature sodium-sulfur batteries.,Nature Communications

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Nickel sulfide nanocrystals on nitrogen-doped porous carbon nanotubes with high-efficiency electrocatalysis for room-temperature sodium-sulfur batteries.
Nature Communications ( IF 14.7 ) Pub Date : 2019-10-22 , DOI: 10.1038/s41467-019-11600-3
Zichao Yan ₁ , Jin Xiao ₂ , Weihong Lai ₁ , Li Wang ₁ , Florian Gebert ₁ , Yunxiao Wang ₁ , Qinfen Gu ₃ , Hui Liu ₄ , Shu-Lei Chou ₁ , Huakun Liu ₁ , Shi-Xue Dou ₁

Affiliation

Polysulfide dissolution and slow electrochemical kinetics of conversion reactions lead to low utilization of sulfur cathodes that inhibits further development of room-temperature sodium-sulfur batteries. Here we report a multifunctional sulfur host, NiS2 nanocrystals implanted in nitrogen-doped porous carbon nanotubes, which is rationally designed to achieve high polysulfide immobilization and conversion. Attributable to the synergetic effect of physical confinement and chemical bonding, the high electronic conductivity of the matrix, closed porous structure, and polarized additives of the multifunctional sulfur host effectively immobilize polysulfides. Significantly, the electrocatalytic behaviors of the Lewis base matrix and the NiS2 component are clearly evidenced by operando synchrotron X-ray diffraction and density functional theory with strong adsorption of polysulfides and high conversion of soluble polysulfides into insoluble Na2S2/Na2S. Thus, the as-obtained sulfur cathodes exhibit excellent performance in room-temperature Na/S batteries.

中文翻译：

氮掺杂多孔碳纳米管上的硫化镍纳米晶体具有高效电催化作用，用于室温钠硫电池。

多硫化物溶解和转化反应缓慢的电化学动力学导致硫阴极利用率低，抑制了室温钠硫电池的进一步发展。在这里，我们报道了一种多功能硫主体，将NiS2纳米晶体植入氮掺杂多孔碳纳米管中，其经过合理设计以实现高多硫化物固定化和转化。由于物理约束和化学键合的协同作用，多功能硫主体的基体的高电子电导率、封闭的多孔结构和极化添加剂有效地固定了多硫化物。值得注意的是，操作同步加速器X射线衍射和密度泛函理论清楚地证明了Lewis基础基质和NiS2组分的电催化行为，具有对多硫化物的强吸附性和可溶性多硫化物向不溶性Na2S2/Na2S的高转化率。因此，所获得的硫正极在室温Na/S电池中表现出优异的性能。

更新日期：2019-10-23

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