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La0.75Sr0.25Cr0.5Mn0.5O3-δ-Ce0.8Sm0.2O1.9 as composite electrodes in symmetric solid electrolyte cells for electrochemical removal of nitric oxide

Li, Wenjie ; Liu, Xiaozhen ; Yu, Han LU ; Zhang, Shuyuan and Yu, Hongbing (2020) In Applied Catalysis B: Environmental 264.
Abstract

Symmetric solid electrolyte cells with La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM)-Ce0.8Sm0.2O1.9 (SDC) composite electrodes are employed for nitric oxide (NO) removal. The LSCM powders are synthesized and the cells with LSCM-SDC composite electrodes are fabricated successfully. The results show that moderate SDC addition in LSCM electrode improves the cell performance due to the expansion of three phase boundaries (TPBs). The electrode with 30 wt% SDC has the highest NO conversion of 69.2% and the lowest polarization resistance at 750 °C in 1000 ppm NO. The cathodic polarization activates the cathode because of the Cr/Mn ions reduction, more surface oxygen... (More)

Symmetric solid electrolyte cells with La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM)-Ce0.8Sm0.2O1.9 (SDC) composite electrodes are employed for nitric oxide (NO) removal. The LSCM powders are synthesized and the cells with LSCM-SDC composite electrodes are fabricated successfully. The results show that moderate SDC addition in LSCM electrode improves the cell performance due to the expansion of three phase boundaries (TPBs). The electrode with 30 wt% SDC has the highest NO conversion of 69.2% and the lowest polarization resistance at 750 °C in 1000 ppm NO. The cathodic polarization activates the cathode because of the Cr/Mn ions reduction, more surface oxygen vacancies and Cr metal exsolution. The cell has good tolerances for H2O, CO2, and SO2, but excess O2 competes with NO for TPBs seriously. The sufficient stability and flexible operation mode of the cell are also proved. Finally, the NO adsorption mechanism on LSCM surface is revealed by density functional theory (DFT) calculations.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Density functional theory, Electrochemical reduction, LaSrCrMnO-CeSmO, Nitric oxide, Solid electrolyte cell
in
Applied Catalysis B: Environmental
volume
264
article number
118533
publisher
Elsevier
external identifiers
  • scopus:85076545486
ISSN
0926-3373
DOI
10.1016/j.apcatb.2019.118533
language
English
LU publication?
yes
id
ad95037b-c183-410c-950a-90c318c615e5
date added to LUP
2020-01-02 11:07:01
date last changed
2022-04-18 19:33:32
@article{ad95037b-c183-410c-950a-90c318c615e5,
  abstract     = {{<p>Symmetric solid electrolyte cells with La<sub>0.75</sub>Sr<sub>0.25</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3-δ</sub> (LSCM)-Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>1.9</sub> (SDC) composite electrodes are employed for nitric oxide (NO) removal. The LSCM powders are synthesized and the cells with LSCM-SDC composite electrodes are fabricated successfully. The results show that moderate SDC addition in LSCM electrode improves the cell performance due to the expansion of three phase boundaries (TPBs). The electrode with 30 wt% SDC has the highest NO conversion of 69.2% and the lowest polarization resistance at 750 °C in 1000 ppm NO. The cathodic polarization activates the cathode because of the Cr/Mn ions reduction, more surface oxygen vacancies and Cr metal exsolution. The cell has good tolerances for H<sub>2</sub>O, CO<sub>2</sub>, and SO<sub>2</sub>, but excess O<sub>2</sub> competes with NO for TPBs seriously. The sufficient stability and flexible operation mode of the cell are also proved. Finally, the NO adsorption mechanism on LSCM surface is revealed by density functional theory (DFT) calculations.</p>}},
  author       = {{Li, Wenjie and Liu, Xiaozhen and Yu, Han and Zhang, Shuyuan and Yu, Hongbing}},
  issn         = {{0926-3373}},
  keywords     = {{Density functional theory; Electrochemical reduction; LaSrCrMnO-CeSmO; Nitric oxide; Solid electrolyte cell}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Applied Catalysis B: Environmental}},
  title        = {{La<sub>0.75</sub>Sr<sub>0.25</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3-</sub>δ-Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>1.9</sub> as composite electrodes in symmetric solid electrolyte cells for electrochemical removal of nitric oxide}},
  url          = {{http://dx.doi.org/10.1016/j.apcatb.2019.118533}},
  doi          = {{10.1016/j.apcatb.2019.118533}},
  volume       = {{264}},
  year         = {{2020}},
}