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Tytuł:
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Electrochemical removal of NO x by La 0.8 Sr 0.2 Mn 1-x Ni x O 3 electrodes in solid electrolyte cells: Role of Ni substitution.
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Autorzy:
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Li W; School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, PR China; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China. Electronic address: .
Yu H; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China; Lund University, Lund 22100, Sweden. Electronic address: .
Zhang Z; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China.
Hei W; Institute of Environmental Science, College of Chemistry, Zhengzhou University, Zhengzhou 450001, PR China.
Liang K; School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, PR China.
Yu H; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China. Electronic address: .
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Źródło:
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Journal of hazardous materials [J Hazard Mater] 2021 Oct 15; Vol. 420, pp. 126640. Date of Electronic Publication: 2021 Jul 14.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Original Publication: Amsterdam : Elsevier,
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MeSH Terms:
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Electrolytes*
Nitrogen Oxides*
Adsorption ; Electrodes ; Oxygen
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Contributed Indexing:
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Keywords: Electrochemical reduction; NO(x) removal; Ni substitution; Perovskite; Solid electrolyte cell
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Substance Nomenclature:
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0 (Electrolytes)
0 (Nitrogen Oxides)
S88TT14065 (Oxygen)
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Entry Date(s):
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Date Created: 20210730 Date Completed: 20211025 Latest Revision: 20211025
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Update Code:
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20240105
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DOI:
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10.1016/j.jhazmat.2021.126640
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PMID:
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34329099
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Electrochemical removal of nitrogen oxides (NO x ) by solid electrolyte cells (SECs) is a promising technology due to no required reductant. Herein, a series of La 0.8 Sr 0.2 Mn 1-x Ni x O 3 (0 ≤ x ≤ 0.5) perovskites were first synthesized and utilized as the electrode materials of SECs. The role of Ni substitution in electrode performance and NO x reduction mechanism were revealed by various experimental characterization and first-principle calculations. The results indicate that the moderate Ni substitution (x ≤ 0.3) increased the NO x conversion of electrodes while reduced the polarization resistance. The further investigation shows that this improvement was attributed to the more surface oxygen vacancies, better reducibility and higher Mn 4+ proportion of the Ni-substituted perovskites. The electrochemical impedance spectroscopy (EIS) shows that these changes facilitated the NO x adsorption and dissociation processes on the electrode. According to first-principle calculations, the Ni-substituted perovskite had a lower formation energy of surface oxygen vacancy, while the NO molecule adsorbed on defect surface gained more electrons thus was easier to be reduced and dissociated. Finally, the electrode performance at different operating temperatures and the operational stability were verified.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
