Abstract To deal with the notorious shuttle behavior and sluggish conversion of lithium polysulfides (LiPSs), heteroatoms doping and defects creating are practical strategies for improving capture and catalytic conversion of LiPSs. In this work, O doped porous carbon materials (OPC) with a 3D hierarchical structure, consisting of 2–4 μm carbon sheets decorated with macrospores of 0.2–0.4 μm, was fabricated with MgO template. It is found that the increasing the carbonization temperature and the amount of MgO will make OPC rich in oxygen functional groups and defect sites. Electrochemical measures show that the OPC12–800 achieves reversible capacity (an initial discharge specific capacity of 1448.4 mAh g−1 at current density of 0.1 C) and cycling performance (717.7 mAh g−1 at 2 C over 200 cycles). The excellent electrochemical performance is attributed to the hierarchical porous structure, abundant C–O/C=O and defects, which effectively adsorbs polysulfides and promote faster redox reaction of LiPSs. This study provides an alternative to improve the performance of carbon materials as host of Li–S batteries by regulating the types of oxygen-containing functional groups and defects on carbon surface.

中文翻译：

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用于多硫化物催化转化的具有 O 掺杂和丰富缺陷的三维碳结构

摘要 为了解决多硫化锂 (LiPSs) 臭名昭著的穿梭行为和转化缓慢的问题，杂原子掺杂和缺陷产生是提高 LiPSs 捕获和催化转化的实用策略。在这项工作中，使用 MgO 模板制造了具有 3D 分层结构的 O 掺杂多孔碳材料 (OPC)，该材料由 2-4 μm 碳片组成，装饰有 0.2-0.4 μm 的大孢子。研究发现，随着碳化温度的升高和MgO用量的增加，OPC会富含氧官能团和缺陷位点。电化学测量表明，OPC12-800 实现了可逆容量（在 0.1 C 的电流密度下的初始放电比容量为 1448.4 mAh g-1）和循环性能（在 2 C 下超过 200 次循环为 717.7 mAh g-1）。优异的电化学性能归因于分级多孔结构、丰富的C-O/C=O和缺陷，有效吸附多硫化物并促进LiPSs更快的氧化还原反应。本研究通过调节碳表面上含氧官能团的类型和缺陷，为提高碳材料作为锂硫电池主体的性能提供了一种替代方法。