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作为-V双原子电催化剂在-硫电池中的辅助剂:3D in 2D"形态诱导器和协调结构调节器

Lubin Yang¹, Yukun Pan¹, Zhiqiang Zhou¹

¹State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.

|August 25, 2023

概括

这项研究引入了一种新的双原子催化剂 (DAC),在碳纳米板上具有Fe-V活性位点. DAC通过改善聚硫化物结合和氧化还原动力学来提高硫电池性能,克服了关键的应用障碍.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

硫 (Li-S) 电池面临的挑战包括多硫化物转运,缓慢的氧化还原动力学和Li2S分解障碍.
这些问题限制了Li-S电池技术的实际应用和性能.

研究的目的:

设计和合成一个集成的电催化剂,以提高Li-S电池性能.
解决 Li-S 电池中穿效应,缓慢动力学和分解能障碍的局限性.

主要方法:

制造一个"二维的3D"碳纳米板结构与N桥 Fe-V双原子活性位点 (Fe/V-N7) 的制造.
研究催化剂和Li2S物种之间的电子结构和结合相互作用.
对催化剂对多硫化物化学吸收和氧化还原动力学影响的实验和理论验证.

主要成果:

碳纳米板 (DAC) 上的Fe/V双原子位点与多硫化物 (Li2Sn) 具有强烈的亲和力和增强的反应性.
达克证明了聚硫化物的强化化学吸收,并显著提高了双向硫氧化还原反应动力学.
"3D in 2D"形态促进了均的硫分布,电子转移和活性部位暴露.

结论:

开发的DAC电催化剂有效地减轻了Li-S电池的关键问题,显示出卓越的性能.
与DAC组装的Li-S电池表现出显著的循环稳定性和高速率能力,即使硫含量高.
这项工作通过先进的电催化剂设计来推进高性能硫电池技术的有希望的战略.

关键词:

这是一种双向催化剂.双原子活性场所是双原子活性场所.电催化剂是一种电催化剂.硫电池是硫电池的一种.金属-N-C 协调

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