TY - JOUR

T1 - Electrochemical properties of dense (La, Sr)MnO_3−δ films produced by pulsed laser deposition

A1 - Plonczak,Pawel

A1 - Sørensen,Daniel Risskov

A1 - Søgaard,Martin

A1 - Esposito,Vincenzo

A1 - Hendriksen,Peter Vang

AU - Plonczak,Pawel

AU - Sørensen,Daniel Risskov

AU - Søgaard,Martin

AU - Esposito,Vincenzo

AU - Hendriksen,Peter Vang

PB - Elsevier BV North-Holland

PY - 2012

Y1 - 2012

N2 - <p>The electrical conductivity and the electrochemical properties of dense La0.85Sr0.15MnO_3−δ (LSM) films, prepared using Pulsed Laser Deposition (PLD) have been investigated. The nano-structure of the LSM films has been characterized using scanning electron microscopy (SEM). The oxygen transport properties of the films were studied using electrochemical impedance spectroscopy (EIS) on symmetrical cells. Electrical conductivity measurement were carried out in an oxygen partial pressure range from 1 to 0.0032atm, and a temperature range from 950 to 700°C. The electrical conductivity at 800°C was 116 S cm⁻¹ and did not vary with the pO2. Impedance spectra were recorded in the temperature range from 600 to 950°C in the oxygen partial pressure range from 0.06 to 1.00atm. At 900°C and 1.00atm the area specific resistance was 30.6Ωcm2 and an activation energy of 2.7eV was found. The ASR increased with decreasing pO2. Based on the impedance spectra an oxide ion conductivity of 5.0×10⁻¹ S cm⁻¹ was found at 900°C and pO2=1.00atm. The characteristic length, at which the oxide transport reaction switch from being limited by bulk diffusion to that of surface exchange, was estimated to be approximately 220 and 130nm at 700 and 900°C, respectively.</p>

AB - <p>The electrical conductivity and the electrochemical properties of dense La0.85Sr0.15MnO_3−δ (LSM) films, prepared using Pulsed Laser Deposition (PLD) have been investigated. The nano-structure of the LSM films has been characterized using scanning electron microscopy (SEM). The oxygen transport properties of the films were studied using electrochemical impedance spectroscopy (EIS) on symmetrical cells. Electrical conductivity measurement were carried out in an oxygen partial pressure range from 1 to 0.0032atm, and a temperature range from 950 to 700°C. The electrical conductivity at 800°C was 116 S cm⁻¹ and did not vary with the pO2. Impedance spectra were recorded in the temperature range from 600 to 950°C in the oxygen partial pressure range from 0.06 to 1.00atm. At 900°C and 1.00atm the area specific resistance was 30.6Ωcm2 and an activation energy of 2.7eV was found. The ASR increased with decreasing pO2. Based on the impedance spectra an oxide ion conductivity of 5.0×10⁻¹ S cm⁻¹ was found at 900°C and pO2=1.00atm. The characteristic length, at which the oxide transport reaction switch from being limited by bulk diffusion to that of surface exchange, was estimated to be approximately 220 and 130nm at 700 and 900°C, respectively.</p>

KW - LSM

KW - Film

KW - SOFC

KW - Cathode

KW - PLD

U2 - 10.1016/j.ssi.2012.03.043

DO - 10.1016/j.ssi.2012.03.043

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

VL - 217

SP - 54

EP - 61

ER -