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

Research output: Contribution to journalArticle

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 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.

Details

Authors
  • Wenjie Li
  • Xiaozhen Liu
  • Han Yu
  • Shuyuan Zhang
  • Hongbing Yu
Organisations
External organisations
  • Nankai University
  • Huazhong University of Science and Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Water Treatment

Keywords

  • Density functional theory, Electrochemical reduction, LaSrCrMnO-CeSmO, Nitric oxide, Solid electrolyte cell
Original languageEnglish
Article number118533
JournalApplied Catalysis B: Environmental
Volume264
Publication statusPublished - 2020
Publication categoryResearch
Peer-reviewedYes