Improved electrochemical stability at the surface of La0.8Sr0.2CoO3 achieved by surface chemical modification
作者： Nikolai Tsvetkov , Qiyang Lu , Bilge Yildiz
DOI: 10.1039/C5FD00023H
关键词:
摘要: The degradation of the surface chemistry on perovskite (ABO3) oxides is a critical issue for their performance in energy conversion systems such as solid oxide fuel/electrolysis cells and splitting H2O CO2 to produce fuels. This typically form segregation phase separation dopant cations from A-site, driven by elastic electrostatic minimization kinetic demixing. In this study, deposition Ti at was found hinder corresponding electrochemical promising SOFC cathode material, La0.8Sr0.2CoO3 (LSC). LSC films modified (denoted LSC-T) deposited TiCl4 solution. LSC-T thin were investigated impedance spectroscopy, nano-probe Auger electron X-ray photoelectron spectroscopy (XPS), upon annealing 420–530 °C air up about 90 hours. oxygen exchange coefficient, kq, cathodes be 8 times higher than that 530 retained its stability. Sr-rich insulating particles formed annealed films, but with significantly less coverage LSC-T. From result, it appears modification reduces blocking surface, larger area (with Sr doping level lattice) available reduction reaction. stabilization through Ti-deposition can open new route designing modifications electrodes high temperature electro- thermo-chemical applications.
rsc.org
harvard.edu
sci-hub.se 参考文章(58)
D. Serrate, J. M. De Teresa, J. Blasco, M. R. Ibarra, L. Morellón, C. Ritter, Large low-field magnetoresistance and TC in polycrystalline (Ba0.8Sr0.2)2-xLaxFeMoO6 double perovskites Applied Physics Letters. ,vol. 80, pp. 4573- 4575 ,(2002) , 10.1063/1.1485119
S. Estradé, J. Arbiol, F. Peiró, I. C. Infante, F. Sánchez, J. Fontcuberta, F. de la Peña, M. Walls, C. Colliex, Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3 Applied Physics Letters. ,vol. 93, pp. 112505- ,(2008) , 10.1063/1.2981574
S. Estradé, J. Arbiol, F. Peiró, Ll. Abad, V. Laukhin, Ll. Balcells, B. Martínez, Cationic Diffusion in La2/3Ca1/3MnO3 Thin Films Grown on LaAlO3 (001) Substrates. Applied Physics Letters. ,vol. 91, pp. 252503- ,(2007) , 10.1063/1.2799740
Naoaki Yabuuchi, Yi-Chun Lu, Azzam N. Mansour, Shuo Chen, Yang Shao-Horn, The Influence of Heat-Treatment Temperature on the Cation Distribution of LiNi0.5Mn0.5O2 and Its Rate Capability in Lithium Rechargeable Batteries Journal of The Electrochemical Society. ,vol. 158, ,(2011) , 10.1149/1.3526309
Hani Dulli, E. W. Plummer, P. A. Dowben, Jaewu Choi, S.-H. Liou, Surface electronic phase transition in colossal magnetoresistive manganese perovskites: La0.65Sr0.35MnO3 Applied Physics Letters. ,vol. 77, pp. 570- 572 ,(2000) , 10.1063/1.127047
S. Estradé, J. M. Rebled, J. Arbiol, F. Peiró, I. C. Infante, G. Herranz, F. Sánchez, J. Fontcuberta, R. Córdoba, B. G. Mendis, A. L. Bleloch, Effects of thickness on the cation segregation in epitaxial (001) and (110) La2/3Ca1/3MnO3 thin films Applied Physics Letters. ,vol. 95, pp. 072507- ,(2009) , 10.1063/1.3211130
Hani Dulli, P. A. Dowben, S.-H. Liou, E. W. Plummer, Surface segregation and restructuring of colossal-magnetoresistant manganese perovskites La 0.65 Sr 0.35 MnO 3 Physical Review B. ,vol. 62, ,(2000) , 10.1103/PHYSREVB.62.R14629
Khabiboulakh Katsiev, Bilge Yildiz, Kavaipatti Balasubramaniam, Paul A. Salvador, Electron tunneling characteristics on La0.7Sr0.3MnO3 thin-film surfaces at high temperature Applied Physics Letters. ,vol. 95, pp. 092106- ,(2009) , 10.1063/1.3204022
Erik Koep, David S. Mebane, Rupak Das, Charles Compson, Meilin Liu, Characteristic Thickness for a Dense La0.8Sr0.2MnO3 Electrode Electrochemical and Solid State Letters. ,vol. 8, ,(2005) , 10.1149/1.2050607
Nikolay A. Tsvetkov, Liudmila L. Larina, Oleg Shevaleevskiy, Essam A. Al-Ammar, Byung Tae Ahn, Design of conduction band structure of TiO2 electrode using Nb doping for highly efficient dye‐sensitized solar cells Progress in Photovoltaics. ,vol. 20, pp. 904- 911 ,(2012) , 10.1002/PIP.2253