Lithium–sulfur batteries (LSBs) suffer from the dissolution of lithium polysulfides (LiPSs) which leading to capacity degradation and poor cycling stability. Hence, weʼve developed the Co/WN@NC Mott–Schottky heterostructures with built in electric field (BIF) are prepared as catalyst model to generate a built-in electric field to enhance the electrocatalytic effect on sulfur electrochemistry. Theoretical and experimental results have jointly demonstrated that the redistribution of charge and the presence of a built-in electric field at the Co/WN@NC heterointerface can promote the redox reaction within lithium sulfur battery during the discharge and charge processes, respectively. Experimental tests have confirmed its outstanding reversibility, achieving a capacity of 793.2 mAh·g over 500 cycles at 1 C. It also shows excellent cycling performance with only 0.05 % attenuation per cycle over 800 cycles at 2 C for LSBs. Furthermore, even with a high sulfur loading of 5.5 mg·cm, the S@ Co/WN@NC cathode maintains favorable sulfur-related electrochemistry and delivers a high areal capacity of 3.61 mAh·cm as well as maintaining considerable stability. This synthetic Mott–Schottky heterostructure not only amplifies the electrocatalytic effect in LSBs, but also advances the design of catalysts for advanced high-energy-density batteries.

中文翻译：

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N掺杂碳负载钴/氮化钨莫特肖特基异质结作为高效电催化剂，可增强高性能锂硫电池多硫化锂的吸附和转化

锂硫电池（LSB）会受到多硫化锂（LiPS）溶解的影响，导致容量下降和循环稳定性差。因此，我们开发了具有内置电场（BIF）的Co/WN@NC莫特-肖特基异质结构作为催化剂模型，以产生内置电场来增强对硫电化学的电催化效果。理论和实验结果共同证明，Co/WN@NC异质界面上电荷的重新分布和内置电场的存在可以分别促进锂硫电池在放电和充电过程中的氧化还原反应。实验测试证实了其出色的可逆性，在 1 C 下循环 500 次，容量达到 793.2 mAh·g。LSB 还表现出优异的循环性能，在 2 C 下循环 800 次，每次循环衰减仅为 0.05%。此外，即使在5.5 mg·cm的高硫负载量下，S@ Co/WN@NC正极仍保持良好的硫相关电化学，并提供3.61 mAh·cm的高面积容量，并保持相当大的稳定性。这种合成的莫特-肖特基异质结构不仅放大了LSB中的电催化效应，而且还推进了先进高能量密度电池的催化剂设计。