Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Effcient Electrocatalysis for Oxygen Evolution Reactions

作     者：Guangyuan Yan Yizhan Wang Ziyi Zhang Yutao Dong Jingyu Wang Corey Carlos Pu Zhang Zhiqiang Cao Yanchao Mao Xudong Wang Guangyuan Yan;Yizhan Wang;Ziyi Zhang;Yutao Dong;Jingyu Wang;Corey Carlos;Pu Zhang;Zhiqiang Cao;Yanchao Mao;Xudong Wang

作者机构：Department of Material Sciences and EngineeringUniversity of Wisconsin-MadisonMadisonWI 53706USA Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024People’s Republic of China MOE Key Laboratory of Materials PhysicsSchool of PhysicsZhengzhou UniversityZhengzhou 450001People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2020年第12卷第4期

页      面：41-52页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by Army Research O ce(ARO)under Grant W911NF-16-1-0198 the National Science Foundation(DMR-1709025) China Scholarship Council 

主　　题：Oxygen evolution reaction Multiphase hybrid Two-dimensional nanomaterials Rare-earth oxides Ionic layer epitaxy 

摘      要：Electrochemical catalysts for oxygen evolution reaction are a critical component for many renewable energy applications. To improve their catalytic kinetics and mass activity are essential for sustainable industrial applications. Here, we report a rare-earth metal-based oxide electrocatalyst comprised of ultrathin amorphous La2O3 nanosheets hybridized with uniform La2O3 nanoparticles(La2O3@NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La2O3@NP-NS exhibits excellent catalytic kinetics with an overpotential of 310 mV at 10 m A cm^-2, a small Tafel slope of 43.1 mV dec^-1, and electrochemical impedance of 38 Ω. More importantly, due to the ultrasmall thickness, its mass activity, and turnover frequency reach as high as 6666.7 A g^-1 and 5.79 s^-1, respectively, at an overpotential of 310 mV. Such a high mass activity is more than three orders of magnitude higher than benchmark OER electrocatalysts, such as IrO2 and RuO2. This work presents a sustainable approach toward the development of highly e cient electrocatalysts with largely reduced mass loading of precious elements.