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首页> 外文期刊>International Journal of Electrochemical Science >Electrocatalytic Polysulfide Traps and their Conversion to long- chain Polysulfides using rGO-Pt composite as electrocatalyst to Improve the Performance of Li-S Battery
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Electrocatalytic Polysulfide Traps and their Conversion to long- chain Polysulfides using rGO-Pt composite as electrocatalyst to Improve the Performance of Li-S Battery

机译：以rGO-Pt复合材料为电催化剂的电催化多硫化物阱及其转化为长链多硫化物，以改善Li-S电池的性能

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Serious shuttle effect and sluggish reaction kinetics are the two major barriers that limit the cathodecycling stability in lithium-sulfur batteries. In this study, we deviate from the prevalent approachcompositing sulfur with various carbonaceous materials by introducing electrocatalysis concept inlithium-sulfur chemistries. Two-dimensional graphene has been used as model system to supportelectrocatalyst Pt. Uniform dispersion of Pt nanoparticles on graphene layers not only demonstrate topreferential adsorption of soluble polysulfide species, but also catalyze efficiently transformation tolong-chain polysulfides in the subsequent redox process. The result rGO-Pt/S composite shows a 29.5%enhancement in capacity over pristine rGO/S electrode. More impressively, rGO-Pt/S electrode exhibitsgood cycling stability at a high rate of 2 C corresponding to a tiny capacity fading rate of 0.01% percycle over 300 discharge/charge cycles. Thus, this work provides a facile strategy for improving theperformance of Li?S batteries toward practical application.
机译：严重的穿梭效应和缓慢的反应动力学是限制锂硫电池阴极循环稳定性的两个主要障碍。在这项研究中，我们通过引入锂-硫化学中的电催化概念，偏离了将硫与各种碳质材料复合的普遍方法。二维石墨烯已被用作支持电催化剂Pt的模型系统。 Pt纳米颗粒在石墨烯层上的均匀分散，不仅表明可溶多硫化物种类的超优先吸附，而且在随后的氧化还原过程中有效催化转化为长链多硫化物。结果rGO-Pt / S复合材料比原始rGO / S电极的容量提高了29.5％。更令人印象深刻的是，rGO-Pt / S电极在2 C的高速率下表现出良好的循环稳定性，相当于在300个放电/充电周期内每周期0.01％的微小容量衰减率。因此，这项工作为提高Li？S电池的性能向实际应用提供了一种简便的策略。

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