Highly active sites of low spin Fe^(Ⅱ)N_(4)species:The identification and the ORR performance
作者机构：State Key Laboratory of Fine ChemicalsCollege of Chemical EngineeringDalian University of TechnologyDalian 116024China College of Chemistry and Molecular Engineering and College of EngineeringPeking UniversityBeijing 100871China Center for Integrative Materials DiscoveryDepartment of Chemistry and Chemical EngineeringUniversity of New HavenCT 06516USA
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第1期
页 面：122-130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]
基 金：the National Key R&D Program of China(No.2017YFA0700103) the National Natural Science Foundation of China(Nos.21932002,21872014,21707015,21902018,21577013) the Postdoctoral Science Foundation of China(Nos.2019 T 120210,2018M 641687) the Natural Science Foundation of Liaoning Province(No.2019-MS-053)
主 题：single sites of FeN_(4) oxygen reduction reaction structure-performance correlation electrocatalysis
摘 要：Over recent years,catalytic materials of Fe-N-C species have been recognized being active for oxygen reduction reaction(ORR).However,the identification of active site remains challenging as it generally involves a pyrolysis process and mixed components being *** Fe_(3)C/C and Fe_(2)N/C samples were synthesized by temperature programmed reduction of Fe precursors in 15%CH_(4)/H_(2)and pure NH_(3),*** acid leaching of Fe_(2)N/C sample,only single sites of FeN_(4)species were presented,providing an ideal model for identification of catalytic functions of the single sites of FeN_(4)in ORR.A correlation was conducted between the concentration of Fe^(Ⅱ)N_(4)in low spin state by Mossbauer spectra and the kinetic current density at 0.8 V in alkaline media,and such a structure-performance correlation assures the catalytic roles of low spin Fe^(Ⅱ)N_(4) species as highly active sites for the ORR.
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