TY - JOUR

T1 - Electrochemical testing of composite electrodes of (La1−xSrx)sMnO3 and doped ceria in NO-containing atmosphere

A1 - Werchmeister,Rebecka Maria Larsen

A1 - Kammer Hansen,Kent

A1 - Mogensen,Mogens Bjerg

AU - Werchmeister,Rebecka Maria Larsen

AU - Kammer Hansen,Kent

AU - Mogensen,Mogens Bjerg

PB - Springer

PY - 2012

Y1 - 2012

N2 - The possibility of using electrochemical cells for removal of NO x from an exhaust gas with excess O2 has been examined. (La1−x Sr x ) s MnO3 (LSM) and ceria doped with Pr or Gd were selected as electrode materials and investigated in three-electrode cells. The electrodes were characterised electrochemically with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), and the gas composition monitored while the electrodes were polarised. The electrodes of (La0.5Sr0.5)0.99MnO3 (LSM50) and Ce0.8Pr0.2O2−δ exhibit higher current densities in 0.1% NO in Ar than in air at 300 to 400 °C during CV. This indicates some apparent selectivity towards NO compared to O2. The electrodes can remove NO, when polarised to at least −0.6 V vs. Pt/Air at 600 °C, and EIS measurements under polarisation indicate that the kinetics of the electrodes change, when the electrode potential gets below −0.6 V vs. Pt/Air.

AB - The possibility of using electrochemical cells for removal of NO x from an exhaust gas with excess O2 has been examined. (La1−x Sr x ) s MnO3 (LSM) and ceria doped with Pr or Gd were selected as electrode materials and investigated in three-electrode cells. The electrodes were characterised electrochemically with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), and the gas composition monitored while the electrodes were polarised. The electrodes of (La0.5Sr0.5)0.99MnO3 (LSM50) and Ce0.8Pr0.2O2−δ exhibit higher current densities in 0.1% NO in Ar than in air at 300 to 400 °C during CV. This indicates some apparent selectivity towards NO compared to O2. The electrodes can remove NO, when polarised to at least −0.6 V vs. Pt/Air at 600 °C, and EIS measurements under polarisation indicate that the kinetics of the electrodes change, when the electrode potential gets below −0.6 V vs. Pt/Air.

KW - Electrochemistry

KW - Nitric-oxide

KW - Direct decomposition

KW - thermal-expansion

KW - Oxygen

KW - Conductivity

KW - Catalysts

KW - Zirconia

KW - Reduction

KW - Impedance

KW - Cells

KW - Composites

KW - Electrical properties

KW - CeO2

KW - Perovskites

KW - Electrochemical deNO(x)

U2 - 10.1007/s10008-011-1421-9

DO - 10.1007/s10008-011-1421-9

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

SN - 1432-8488

IS - 2

VL - 16

SP - 703

EP - 714

ER -