Lithium‐sulfur (Li‐S) batteries have garnered significant interest as a strong contender for future energy storage, characterized by their remarkable energy density and cost‐effectiveness. However, the sluggish conversion kinetics of the polysulfide intermediates, compounded with their shuttling behaviors, pose considerable challenges in sulfur electrochemistry. Herein, we develop a novel iron monoboride (FeB) electrocatalyst for boosting sulfur reactions and enhancing Li‐S battery performance. The ultrafine powdery FeB affords abundant and fully exposed active interfaces for host‐guest interactions. Meanwhile, the intrinsic high conductivity of FeB, combined with its strong adsorption and catalytic activity to polysulfides, enables substantial inhibition of the shuttle effect and enhancement of conversion kinetics. As a result, sulfur electrodes equipped with the FeB nanocatalyst realize excellent cyclability with a minimal capacity fading of 0.04 % per cycle over 500 cycles, as well as favorable rate capability up to 7 C. Moreover, decent areal capacity and cycling stability can be also achieved under high‐loading (5.1 mg cm‐2) and limited‐electrolyte (7.0 mL g‐1) configurations. This study presents a facile approach and insightful perspective on nanostructured metal boride for highly efficient sulfur electrocatalysis, holding good promise for the advancement of high‐performance Li‐S batteries.

中文翻译：

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超细硼化铁作为高效纳米催化剂可加速高性能锂硫电池的硫氧化还原电化学

锂硫（Li-S）电池作为未来储能的有力竞争者，以其卓越的能量密度和成本效益而引起了人们的广泛关注。然而，多硫化物中间体缓慢的转化动力学及其穿梭行为给硫电化学带来了相当大的挑战。在此，我们开发了一种新型一硼化铁（FeB）电催化剂，用于促进硫反应并提高锂硫电池性能。超细粉末状 FeB 为主客体相互作用提供了丰富且完全暴露的活性界面。同时，FeB固有的高电导率，结合其对多硫化物的强吸附和催化活性，能够显着抑制穿梭效应并增强转化动力学。因此，配备 FeB 纳米催化剂的硫电极实现了优异的循环性能，在 500 次循环中，每个循环的容量衰减最小为 0.04%，以及高达 7 C 的良好倍率性能。此外，还具有良好的面积容量和循环稳定性。在高负荷（5.1 mg cm-2）和有限电解质（7.0 mL g-1）配置下实现。这项研究为高效硫电催化的纳米结构金属硼化物提供了一种简便的方法和富有洞察力的视角，为高性能锂硫电池的发展带来了良好的前景。