CrX2 (X = S, Se和Te)单层双功能电催化剂在非水锂氧电池中氧还原和析出反应的Ab-initio分析

IF 9.7 1区 化学 Q1 CHEMISTRY, PHYSICAL
Journal of Colloid and Interface Science Pub Date : 2026-01-01 Epub Date: 2025-08-19 DOI:10.1016/j.jcis.2025.138775
Nikhil M Solanki, Suresh V Chaudhary, Gaushiya A Shaikh, Sanjeev K Gupta, P N Gajjar
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引用次数: 0

摘要

与传统锂离子电池相比,锂氧电池重量轻,能量密度高,是下一代电池设备。这些电池包括一个金属阳极终端和一个氧扩散阴极终端,其中氧被用作与周围空气中的金属原子的反应物。然而,这些系统在氧化还原反应过程中由于在负极形成不溶性产物而面临动力学缓慢和过电位高的问题。针对这些主要问题,提出了提高电池性能对催化剂材料的要求。考虑到这一点,我们已经研究了CrX2 (X = S, Se和Te)单层(ML)作为LiO2电池催化剂材料的潜力。本文采用密度泛函理论(DFT)方法系统地研究了CrX2 ML的稳定性和电子性质。在动力学和热稳定性方面,进行了声子色散曲线和从头算分子动力学(AIMD)模拟。这三种材料都表现出优异的导电性,并且在能量上有利于Li原子和O2分子的吸附。所有材料的初始成核过程始于Li金属的吸附,并遵循*Li LiO2路径。进一步分析了氧还原反应机理中LixO2y反应中间体的吸附行为、结构几何形状和电荷分布,表明CrX2 MLs遵循4条电子路径,最终放电产物为2(Li2O)。此外,我们还研究了氧还原反应(ORR)和析氧反应(OER)过程中相应中间体的自由能。计算得到的ORR和OER过电位明显较低:CrS2 (0.27 V和0.71 V)、CrSe2 (0.22 V和0.71 V)和CrTe2 (0.17 V和0.33 V)。研究结果表明,CrX2 MLs是一种高性能的催化剂材料,可以加快LiO2电池系统的催化活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ab-initio analysis of CrX2 (X = S, Se and Te) monolayers as bifunctional electrocatalysts for oxygen reduction and evolution reaction in nonaqueous lithium-oxygen batteries.

Lithium-oxygen batteries are next-generation battery devices due to lightweight nature and high energy density with compared to conventional Li-ion batteries. These batteries consist a metal anode terminal and an oxygen diffused cathode terminal, in which oxygen is used as a reactant with metal atoms from surrounding air. Nonetheless, these systems facing the problems related to sluggish kinetics and higher overpotential due to formation of insoluble products at negative electrode during redox reaction. To address these major issues, the requirement of catalyst materials is raised to enhance the battery performance. Keep this in mind, we have investigated the potential of CrX2 (X = S, Se and Te) monolayer (ML) as a catalyst material for LiO2 batteries. Here, we systematically examined the stability and electronic properties of CrX2 ML using density functional theory (DFT) approach. For the dynamical and thermal stabilities, the phonon dispersion curves and ab initio molecular dynamics (AIMD) simulation were performed. All three materials exhibit outstanding conductivity and are energetically favourable for adsorption of Li atoms and O2 molecules. The initial nucleation process in all materials begins with the adsorption of Li metal and follows *Li➔*LiO2 path. Further, analysis the adsorption behaviour, structural geometries and charge distribution of LixO2y reaction intermediates during oxygen reduction reaction mechanism, show that CrX2 MLs follows four electron pathways, resulting in 2(Li2O) as the final discharge product. Additionally, we have investigated the free energy for corresponding intermediates involved in both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) process. The calculated ORR and OER overpotentials are notably low: CrS2 (0.27 V and 0.71 V), CrSe2 (0.22 V and 0.71 V) and CrTe2 (0.17 V and 0.33 V). Our results shows that CrX2 MLs are serve as high performance catalyst materials to expedite the catalytic activities for LiO2 battery systems.

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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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