Rationalizing the catalytic surface area of oxygen vacancy-enriched layered perovskite LaSrCrO4 nanowires on oxygen electrocatalyst for enhanced performance of Li–O2 batteries

IF 19.5 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Energy Pub Date : 2024-09-06 DOI:10.1002/cey2.550

Myeong-Chang Sung, Chan Ho Kim, Byoungjoon Hwang, Dong-Wan Kim

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Abstract

Efficient electrocatalysis at the cathode is crucial to addressing the limited stability and low rate capability of Li−O₂ batteries. This study examines the kinetic behavior of Li−O₂ batteries utilizing layered perovskite LaSrCrO₄ nanowires (NWs) composed of lower oxidation states. Layered perovskite LaSrCrO₄ NWs exhibited improved rate capability over a wide range of current densities and longer cycle life in Li−O₂ batteries than V-based layered perovskite (LaSrVO₄) and simple perovskite (La_0.8Sr_0.2CrO₃) NWs. X-ray photoelectron spectroscopy and electrochemical surface area analyses showed that the observed performance variations primarily stemmed from active sites such as oxygen vacancies. In situ Raman analysis showed that these active sites significantly modulate the kinetics of oxygen reduction and evolution, which are related to LiO₂ intermediate adsorption. Electrochemical impedance spectroscopy showed that the active sites in layered perovskite LaSrCrO₄ NWs contributed to their high charge transfer capability and reduced polarization. This study presents an appealing method for the precise fabrication and analysis of Cr-based layered perovskites, aimed at achieving highly efficient and stable bifunctional oxygen electrocatalysis.

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合理利用氧电催化剂上富含氧空位的层状过氧化物 LaSrCrO4 纳米线的催化表面积，提高二氧化锰锂电池的性能

阴极的高效电催化对于解决二氧化锰锂电池的有限稳定性和低速率能力至关重要。本研究利用由低氧化态组成的层状过氧化物 LaSrCrO4 纳米线（NWs）研究了二氧化锰锂电池的动力学行为。与基于 V 的层状包晶体（LaSrVO4）和简单包晶体（La0.8Sr0.2CrO3）纳米线相比，层状包晶体 LaSrCrO4 纳米线在锂-O2 电池中表现出更高的电流密度范围内的速率能力和更长的循环寿命。X 射线光电子能谱和电化学表面积分析表明，观察到的性能变化主要源于氧空位等活性位点。原位拉曼分析表明，这些活性位点极大地调节了氧还原和进化的动力学，这与二氧化锂中间体的吸附有关。电化学阻抗光谱显示，层状包晶体 LaSrCrO4 纳米晶中的活性位点有助于提高电荷转移能力和降低极化。这项研究为精确制备和分析铬基层状包晶石提供了一种极具吸引力的方法，旨在实现高效稳定的双功能氧电催化。

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来源期刊

Carbon Energy Multiple-

CiteScore

25.70

自引率

10.70%

发文量

116

审稿时长

4 weeks

期刊介绍： Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.