Electrochemical removal of NOx by La0.8Sr0.2Mn1−xNixO3 electrodes in solid electrolyte cells : Role of Ni substitution
(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.
(Less)
- author
- Li, Wenjie ; Yu, Han LU ; Zhang, Zhenzong ; Hei, Wanting ; Liang, Ke and Yu, Hongbing
- organization
- publishing date
- 2021-10
- 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
- 2024-09-22 08:10:49
@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}}, }