Performance Enhancement of Intermediate Temperature SOFC Cathode by Nano-Composite Coating


Saim Saher,Kamran Alam,Affaq Qamar,Abid Ullah,Javed Iqbal,





The La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is categorized as a mixed ionic-electronic conducting oxide has found significant attention as cathode material in solid oxide fuel cells (SOFCs) operating at intermediate temperatures, 500-850oC. The performance of LSCF electrode is limited by the oxygen ion transport process at the surface, which is the rate determining step of oxygen reduction reaction. To enhance the oxygen surface exchange process of LSCF electrode, a nano-composite electrolyte is introduced at the surface, which substantially improves the electrochemical performance. The electrical conductivity relaxation technique (ECR) has been used to study the oxygen surface exchange kinetics of bare LSCF and coated with a mixture of Ce0.8Sm0.2O2-δ (SDC) and ZrO2.Y2O3 (Yttria-stabilized zirconia -YSZ) nano-powders in three different weight ratios, SDC:YSZ = 0.5:1, 1:1, 1:0.5. The chemical oxygen surface exchange coefficient kchem of surface modified specimens were derived with a one-parameter fitting process. The results show that the oxygen surface exchange kinetics of LSCF is affected by the SDC-YSZ coating and the average kchem values of SDC-YSZ coated LSCF increases by a factor 2 to 8 from 650 to 850 oC, respectively. It has been concluded that the high ionic conductive oxide coating improves the oxygen surface exchange kinetics of underlying LSCF mixed conducting oxide and consequently enhances the performance of electrochemical device such as solid oxide fuel cell.


I.A.Samreen, S. Saher, S. Ali, H. Shahzad, A. Qamar, Effect of hetero-structured nano-particulate coating on the oxygen surface exchange properties of La0.6Sr0.4Co0.2Fe0.8O3-δ, Int. Journal of Hydrogen Energy, HE-25296, 2019 (in press).

II.Cheng, F., & Chen, J. (2012). Metal–air batteries: from oxygen reduction electrochemistry to cathode catalysts.Chemical Society Reviews,41(6), 2172-2192.

III.Fekete, M., Hocking, R. K., Chang, S. L., Italiano, C., Patti, A. F., Arena, F., &Spiccia, L. (2013). Highly active screen-printed electrocatalysts for water oxidation based on β-manganese oxide.Energy & Environmental Science,6(7), 2222-2232.

IV.Gorlin, Y., & Jaramillo, T. F. (2010). A bifunctional nonprecious metal catalyst for oxygen reduction and water oxidation.Journal ofthe American Chemical Society,132(39), 13612-13614.

V.Haoran, Y., Lifang, D., Tao, L., & Yong, C. (2014). Hydrothermal synthesis of nanostructured manganese oxide as cathodic catalyst in a microbial fuel cell fed with leachate.The Scientific World Journal,2014.

VI.He, G., Qiao, M., Li, W., Lu, Y., Zhao, T., Zou, R., &Parkin, I. P. (2017). S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance.Advanced Science,4(1), 1600214.

VII.Iyer, A., Del-Pilar, J., King’ondu, C. K., Kissel, E., Garces, H. F., Huang, H., &Suib, S. L. (2012). Water oxidation catalysis using amorphous manganese oxides, octahedral molecular sieves (OMS-2), and octahedral layered (OL-1) manganese oxide structures.The Journal of Physical Chemistry C,116(10), 6474-6483.

VIII.Kjaergaard, C. H., Rossmeisl, J., &Nørskov, J. K. (2010). Enzymatic versus inorganic oxygen reduction catalysts: Comparison of the energy levels in a free-energy scheme.Inorganic chemistry,49(8), 3567-3572.

IX.Kundu, S., Nagaiah, T. C., Xia, W., Wang, Y., Dommele, S. V., Bitter, J. H., &Muhler, M. (2009). Electrocatalytic activity and stability of nitrogen-containing carbon nanotubes in the oxygen reduction reaction.The Journal of Physical Chemistry C,113(32), 14302-14310.

X.Liao, L., Zhang, Q., Su, Z., Zhao, Z., Wang, Y., Li, Y., &Cai, X. (2014). Efficient solar water-splitting using a nanocrystallineCoOphotocatalyst.Nature nanotechnology,9(1), 69.

XI.Mukerjee, S., &Srinivasan, S. (1993). Enhanced electrocatalysis of oxygenreduction on platinum alloys in proton exchange membrane fuel cells.Journal of Electroanalytical Chemistry,357(1-2), 201-224.

XII.Shi, X., Iqbal, N., Kunwar, S. S., Wahab, G., Kasat, H. A., &Kannan, A. M. (2018). PtCo@ NCNTs cathode catalyst using ZIF-67 for proton exchange membrane fuel cell.International Journal of Hydrogen Energy,43(6), 3520-3526.

XIII.Shinozaki, K., Zack, J. W., Richards, R. M., Pivovar, B. S., &Kocha, S. S. (2015). Oxygen reduction reaction measurements on platinum electrocatalysts utilizing rotating disk electrode technique I. Impact of impurities, measurement protocols and applied corrections.Journal of The Electrochemical Society,162(10), F1144-F1158.

XIV.S. Saher, S. Naqash, B. A. Boukamp, B. Li, C. Xia, H. J. M. Bouwmeester, Influence of ionic conductivity of the nano-particulate coating phase on oxygen surface exchange of La0.58Sr0.4Co0.8Fe0.2O3-δ , J. Mater. Chem. A, 5 (3),2017, 4991-4999.

XV.Song, E., Shi, C., & Anson, F. C. (1998). Comparison of the behavior of several cobalt porphyrins as electrocatalysts for the reduction of O2 at graphite electrodes.Langmuir,14(15), 4315-4321.

XVI.Su, B., Hatay, I., Trojánek, A., Samec, Z., Khoury, T., Gros, C. P., &Girault, H. H. (2010). Molecular electrocatalysis for oxygen reduction by cobalt porphyrins adsorbed at liquid/liquid interfaces.Journal of the American Chemical Society,132(8), 2655-2662.

XVII.Xia, B. Y., Yan, Y., Li, N., Wu, H. B., Lou, X. W. D., & Wang, X. (2016). A metal–organic framework-derived bifunctional oxygen electrocatalyst.Nature Energy,1(1), 15006.

XVIII.Yang, J., Sun, H., Liang, H., Ji, H., Song, L., Gao, C., &Xu, H. (2016). A highly efficient metal‐free oxygen reduction electrocatalyst assembled from carbon nanotubes and graphene.Advanced Materials,28(23), 4606-4613.

XIX.Zhang, W., Shaikh, A. U., Tsui, E. Y., &Swager, T. M. (2009). Cobalt porphyrin functionalized carbon nanotubes for oxygen reduction.Chemistry of Materials,21(14), 3234-3241.

XX.Zhang, X., Chen, Y., Wang, J., &Zhong, Q. (2016). Nitrogen and fluorine dual‐doped carbon black as an efficient cathode catalyst for oxygen reduction reaction in neutral medium.ChemistrySelect,1(4), 696-702.

Saim Saher, Kamran Alam, Affaq Qamar, Abid Ullah, Javed Iqbal View Download