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Electrochemical removal of NOx by La0.8Sr0.2Mn1−xNixO3 electrodes in solid electrolyte cells : Role of Ni substitution

Li, Wenjie ; Yu, Han LU ; Zhang, Zhenzong ; Hei, Wanting ; Liang, Ke and Yu, Hongbing (2021) In Journal of Hazardous Materials 420.
Abstract

Electrochemical removal of nitrogen oxides (NOx) by solid electrolyte cells (SECs) is a promising technology due to no required reductant. Herein, a series of La0.8Sr0.2Mn1−xNixO3 (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 NOx 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 NOx conversion of electrodes while reduced the polarization resistance. The further investigation shows that this improvement was... (More)

Electrochemical removal of nitrogen oxides (NOx) by solid electrolyte cells (SECs) is a promising technology due to no required reductant. Herein, a series of La0.8Sr0.2Mn1−xNixO3 (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 NOx 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 NOx 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 Mn4+ proportion of the Ni-substituted perovskites. The electrochemical impedance spectroscopy (EIS) shows that these changes facilitated the NOx 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.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrochemical reduction, Ni substitution, NO removal, Perovskite, Solid electrolyte cell
in
Journal of Hazardous Materials
volume
420
article number
126640
publisher
Elsevier
external identifiers
  • scopus:85110626681
  • pmid:34329099
ISSN
0304-3894
DOI
10.1016/j.jhazmat.2021.126640
language
English
LU publication?
yes
id
3abdce09-b7da-4008-b1d0-0eb56f2797f1
date added to LUP
2021-12-23 10:13:10
date last changed
2024-06-15 23:11:50
@article{3abdce09-b7da-4008-b1d0-0eb56f2797f1,
  abstract     = {{<p>Electrochemical removal of nitrogen oxides (NO<sub>x</sub>) by solid electrolyte cells (SECs) is a promising technology due to no required reductant. Herein, a series of La<sub>0.8</sub>Sr<sub>0.2</sub>Mn<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub> (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<sub>x</sub> 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<sub>x</sub> 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<sup>4+</sup> proportion of the Ni-substituted perovskites. The electrochemical impedance spectroscopy (EIS) shows that these changes facilitated the NO<sub>x</sub> 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.</p>}},
  author       = {{Li, Wenjie and Yu, Han and Zhang, Zhenzong and Hei, Wanting and Liang, Ke and Yu, Hongbing}},
  issn         = {{0304-3894}},
  keywords     = {{Electrochemical reduction; Ni substitution; NO removal; Perovskite; Solid electrolyte cell}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Hazardous Materials}},
  title        = {{Electrochemical removal of NO<sub>x</sub> by La<sub>0.8</sub>Sr<sub>0.2</sub>Mn<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub> electrodes in solid electrolyte cells : Role of Ni substitution}},
  url          = {{http://dx.doi.org/10.1016/j.jhazmat.2021.126640}},
  doi          = {{10.1016/j.jhazmat.2021.126640}},
  volume       = {{420}},
  year         = {{2021}},
}