Atomic-level correlation between the electrochemical performance of an oxygen-evolving catalyst and the effects of CeO_(2) functionalization  

作　　者：Yanyan Li Wen Luo Duojie Wu Qi Wang Jie Yin Pinxian Xi Yongquan Qu Meng Gu Xinyu Zhang Zhouguang Lu Zhiping Zheng 

机构地区：[1]School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Department of Chemistry,Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen 518055,China [3]Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology),Ministry of Education,Shenzhen 518055,China [4]Department of Materials Science and Engineering,Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Southern University of Science and Technology,Shenzhen 518055,China [5]Department of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen 518055,China [6]Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province,State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Research Centre of Biomedical Nanotechnology,Lanzhou University,Lanzhou 730000,China [7]School of Chemical Engineering and Technology,Center for Applied Chemical Research,Frontier Institute of Science and Technology,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Nano Research》2022年第4期2994-3000,共7页纳米研究（英文版）

基　　金：This work was financially supported by Shenzhen Nobel Prize Scientists Laboratory Project(No.C17213101);Guangdong Provincial Key Laboratory of Catalysis(No.2020B121201002);Guangdong Provincial Key Laboratory of Energy Materials for Electric Power(No.2018B030322001);China Postdoctoral Science Foundation(No.2018M642133,X.Y.Z.);Post-doctorate Scientific Research Fund for staying(coming to)Shenzhen(No.K21217502,X.Y.Z.);the National Natural Science Foundation of China(No.21671096,Z.G.L.);Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials(No.ZDSYS20200421111401738,Z.G.L.);The authors also acknowledge the assistance of Southern University of Science and Technology Core Research Facilities(SUSTech CRF);Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology).

摘　　要：Herein,we prepared a bimetallic layered double hydroxide(FeCo LDH)featuring a dandelion-like structure.Anchoring of CeO_(2)onto FeCo LDH produced interfaces between the functionalizing CeO_(2)and the parent LDH.Comparative electrochemical studies were carried out.Onset potential,overpotential,and Tafel slope point to the superior oxygen-evolving performance of CeO_(2)-FeCo LDH with respect to FeCo LDH,therefore,demonstrating the merits of CeO_(2)functionalization.The electronic structures of Fe,Co,and Ce were analyzed by X-ray photoelectron spectroscopy(XPS)and electron energy loss spectroscopy(EELS)from which the increase of Co^(3+)and the concurrent lowering of Ce^(4+)were established.With the use of CeO_(2)-FeCo LDH,accelerated formation at a sizably reduced potential of Co-OOH,one of the key intermediates preceding the release of O_(2)was observed by in situ Raman spectroscopy.We now have the atomic-level and location-specific evidence,the increase of the active Co^(3+)across the interface to correlate the enhanced catalytic performance with CeO_(2)functionalization.

关 键 词：CeO_(2)nanoparticles metal layered double hydroxides(LDHs) oxygen evolution reaction intermediate conversion 

分 类 号：O64[理学—物理化学]