Activating copper oxide for stable electrocatalytic ammonia oxidation reaction via in-situ introducing oxygen vacancies
作者机构：Department of ChemistryZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceSchool of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced TechnologyWestlake Institute for Advanced StudyHangzhou 310024China Center of Artificial Photosynthesis for Solar FuelsSchool of ScienceWestlake UniversityHangzhou 310024China Green Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450001China School of ScienceWestlake Institute for Advanced StudyHangzhou 310024China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第7期
页 面：5987-5994页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学]
基 金：This work was supported by Westlake Education Foundation.
主 题：electrocatalysis ammonia oxidation reaction oxygen vacancy CuO stability
摘 要：Electrocatalytic ammonia oxidation reaction(EAOR)provides an ideal solution for on-board hydrogen supply for fuel cells,while the lack of efficient and durable EAOR catalysts has been a long-standing obstacle for its practical application.Herein,we reported that the defect engineering via in-situ electrochemically introducing oxygen vacancies(Vo)not only turns the inactive CuO into efficient EAOR catalyst but also achieves a high stability of over 400 h at a high current density of~200 mA·cm^(−2).Theoretical simulation reveals that the presence of Vo on the CuO surface induces a remarkable upshift of the d-band center of active Cu site closer to the Fermi level,which significantly stabilizes the reaction intermediates(*NHx)and efficiently oxidizes NH3 into N2.This Vo-modulated CuO shows a different catalytic mechanism from that on the conventional Pt-based catalysts,paving a new avenue to develop inexpensive,efficient,and robust catalysts,not limited to EAOR.
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