It is extremely desirable to develop efficient sulfur reduction reaction (SRR) electrocatalysts for lithium-sulfur (Li–S) batteries. In this work, a small intestinal structure sulfur electrocatalyst, viz. Ni2P-CNTs@NHCF nanoreactor, is designed by a facile coaxial electrostatic spinning strategy. Experimental results and theoretical calculations indicate that the synergetic effect of Ni–S and Li–P dual chemical bonds between Ni2P and lithium polysulfides (LiPSs) optimizes the chemisorption energy of LiPSs and reduces reaction energy barriers from liquid LiPSs to solid Li2S, thus achieving the successive immobilization-diffusion-conversion process of sulfur species. As a result, the cell modified with Ni2P-CNTs@NHCF catalyst exhibits the excellent reversible capacities and cyclic stability. With the high sulfur loading of 8.13 mg cm−2 and low electrolyte/sulfur ratio of 6 μL mg−1, it displays a significant initial areal capacity of 13.4 mAh cm−2 and remains 7.1 mAh cm−2 after 80 cycles at 0.1 C. This work offers an effective strategy on rational design of efficient electrocatalysts, and provides considerable insights into the mechanical comprehension of SRR.

中文翻译：

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小肠结构 Ni2P-CNTs@NHCF 纳米反应器加速高性能锂硫电池的硫转化动力学


开发用于锂硫 （Li-S） 电池的高效硫还原反应 （SRR） 电催化剂是非常可取的。在这项工作中，一种小肠结构的硫电催化剂，即。Ni2P-CNTs@NHCF 纳米反应器是通过简单的同轴静电纺丝策略设计的。实验结果和理论计算表明，Ni2P 和多硫化锂 （LiPSs） 之间 Ni-S 和 Li-P 双重化学键的协同作用优化了 LiPSs 的化学吸附能，降低了从液态 LiPSs 到固体 Li2S 的反应能垒，从而实现了硫物种的连续固定化-扩散-转化过程。因此，用 Ni2P-CNTs@NHCF 催化剂改性的电池表现出优异的可逆能力和循环稳定性。凭借 8.13 mg cm-2 的高硫负载量和 6 μL mg-1 的低电解质/硫比，它显示出 13.4 mAh cm-2 的显着初始面容量，并在 0.1 C 下循环 80 次后保持 7.1 mAh cm-2。这项工作为高效电催化剂的合理设计提供了一种有效的策略，并为 SRR 的力学理解提供了相当大的见解。