Enhancement of NOx removal performance for (La0.85Sr0.15)0.99MnO3/Ce0.9Gd0.1O1.95 electrochemical cells by NOx storage/reduction adsorption layers

Jing Shao, Kent Kammer Hansen

Research output: Contribution to journalJournal articlepeer-review

Abstract

This study investigated the effect of adding a NOx adsorption layer to the cathode of an electrochemical cell on the removal of NOx from gaseous mixtures. The cathode was a composite of (La0.85Sr0.15)0.99MnO3 (LSM15) and Ce0.9Gd0.1O1.95 (CGO10). Two different kinds of adsorption layers, K–Pt–Al2O3 layer and Ba–Pt–Al2O3 layer (known as NOx storage/reduction (NSR) catalyst), were studied. The effects of the NSR adsorption layers on the electrode processes were characterized by electrochemical impedance spectroscopy (EIS). Both adsorption layers increased the reduction of NOx to N2 in an atmosphere that contained only NO. When O2 was present with NO in the atmosphere, the K–Pt–Al2O3 adsorption layer significantly enhanced the conversion of NOx to N2, but the Ba–Pt–Al2O3 adsorption layer had no effect. The selective removal of NOx under O2-rich conditions was achieved by modifying the LSM15/CGO10 cell with a suitable NSR adsorption layer. The improvement for NOx reduction by the adsorption layers was mainly contributed by the promotion of the adsorption and surface diffusion of NOx species at/near the triple phase boundary (TPB) regions of the electrode and probably the formation of a short and effective reaction path for NOx reduction. A stronger capability for oxidizing NO and/or trapping NOx under the test conditions may have contributed to the superior performance of the K–Pt–Al2O3 adsorption layer relative to the Ba–Pt–Al2O3 layer. © 2012 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalElectrochimica Acta
Volume90
Pages (from-to)482-491
ISSN0013-4686
DOIs
Publication statusPublished - 2013

Keywords

  • LSM15/CGO10 cathode
  • NOx removal
  • NSR
  • Impedance
  • Diesel engine exhaust

Fingerprint

Dive into the research topics of 'Enhancement of NO<sub>x </sub>removal performance for (La<sub>0.85</sub>Sr<sub>0.15</sub>)<sub>0.99</sub>MnO<sub>3</sub>/Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95</sub> electrochemical cells by NO<sub>x</sub> storage/reduction adsorption layers'. Together they form a unique fingerprint.

Cite this