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Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce3+/Ce4+ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped alpha-MoO3 Catalysts
Li, PH; Song, ZY; Yang, M; Chen, SH; Xiao, XY; Duan, WC; Li, LN; Huang, XJ
2020
Source PublicationANALYTICAL CHEMISTRY
ISSN0003-2700
Volume92Issue:24Pages:16089-16096
Subtype期刊论文
AbstractModulating the active sites of oxygen vacancies (OVs) to enhance the catalytic properties of nanomaterials has attracted much research interest in various fields, but its intrinsic catalytic mechanism is always neglected. Herein, we establish an efficient strategy to promote the electrochemical detection of Pb(II) by regulating the concentration of OVs in alpha-MoO3 nanorods via doping Ce3+/Ce4+ ions. alpha-MoO3 with the Ce-doped content of 9% (C9M) exhibited the highest detection sensitivity of 106.64 mu M mu A(-1) for Pb(II), which is higher than that achieved by other metal oxides and most precious metal nanomaterials. It is found that C9M possessed the highest concentration of OVs, which trapped some electrons for strong affinity interaction with Pb(II) and provided numerous atomic level interfaces of high surface free energy for catalysis reactions. X-ray absorption fine structure spectra and density functional theory calculation indicate that Pb(II) was bonded with the surface-activated oxygen atoms (Os) around Ce ions and obtained some electrons from Os. Besides, the longer Pb-O bonds on C9M were easier to break, causing a low desorption energy barrier to effectively accelerate Pb(II) desorbing to the electrode surface. This study helps to understand the changes in electronic structure and catalytic performance with heteroatom doping and OVs in chemically inert oxides and provide a reference for designing high-active electrocatalytic interfaces to realize ultrasensitive analysis of environmental contaminants.
KeywordOXIDE PERFORMANCE NANOSHEETS
DOI10.1021/acs.analchem.0c03725
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32843
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Environm Opt & Technol, HFIPS, Hefei 230031, Peoples R China
2.Chinese Acad Sci, Inst Solid State Phys, Environm Mat & Pollut Control Lab, HFIPS, Hefei 230031, Peoples R China
3.Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
4.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
Recommended Citation
GB/T 7714
Li, PH,Song, ZY,Yang, M,et al. Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce3+/Ce4+ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped alpha-MoO3 Catalysts[J]. ANALYTICAL CHEMISTRY,2020,92(24):16089-16096.
APA Li, PH.,Song, ZY.,Yang, M.,Chen, SH.,Xiao, XY.,...&Huang, XJ.(2020).Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce3+/Ce4+ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped alpha-MoO3 Catalysts.ANALYTICAL CHEMISTRY,92(24),16089-16096.
MLA Li, PH,et al."Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce3+/Ce4+ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped alpha-MoO3 Catalysts".ANALYTICAL CHEMISTRY 92.24(2020):16089-16096.
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