Cotton-Fibers Used as Pore Former for the Anode with High Porosity and Long Cylindrical Pores of Solid Oxide Fuel Cells

Abstract:

The anode microstructure is crucial for the performance of solid oxide fuel cell(SOFC). The porous anode with high porosity and long cylindrical pores was prepared by using cotton-fiber as pore-former. With Ni-yttria stabilized zirconia (YSZ) as anode, La_0.85Sr_0.15MnO₃-YSZ as cathode, YSZ electrolyte-supported cell was fabricated by slurry coating method. For a comparison, the unit cell with the conventional flour as anode pore former was prepared. All the as-prepared cells were measured in hydrogen at 650 to 800 °C. The microstructure of tested cells was observed by scanning electron microscopy (SEM). The SEM shows that the long cylindrical pores produced by cotton-fibers were beneficial to provide continuous gas pathways for rapid diffusion of fuel and reaction products in the anode. Compared the flour of 373.74 mW·cm^-2 at 800 °C, the maximum density of unit-cell prepared by cotton-fibers was higher than 900 mW·cm^-2, which was attribute to an enlarger active reaction sites created by cotton-fibers for hydrogen oxidation.

• Periodical: Applied Mechanics and Materials (Volume 851)
• Pages: 78-83
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.851.78
• Online since: August 2016
• Authors: Hong Xin You*, Cong Zhao, Can Li, Bin Qu, Guo Qing Guan, Abudula Abuliti
• Keywords: Anode, Cotton-Fiber, High Porosity, Long Cylindrical Pores, SOFC

References

[1] L. Yang, C.D. Zuo, S.Z. Wang, et al, A Novel Composite Cathode for Low-Temperature SOFCs Based on Oxide Proton Conductors, Adv. Mater. 20(17) (2008) 3280-3283.

DOI: 10.1002/adma.200702762

[2] B.C. Steele, H. Angelika, Materials for fuel cell technologies, Nature, 414 (2001) 345-352.

[3] J. Liu, S.A. Barnett, Operation of anode-supported solid oxide fuel cells on methane and natural gas, Solid State Ionics, 158(1) (2003) 11-16.

DOI: 10.1016/s0167-2738(02)00769-5

[4] T. Suzuki, Z. Hasan, Y. Funahashi, et al, Impact of anode microstructure on solid oxide fuel cells, Sci. 325 (2009) 852–855.

DOI: 10.1126/science.1176404

[5] A.V. Virkar, J. Chen, C.W. Tanner, et al, The Role of Electrode Microstructure on Activation and Concentration Polarizations in Solid Oxide Fuel Cells, Solid State Ionics, 131(00) (1999) 189-198.

DOI: 10.1016/s0167-2738(00)00633-0

[6] S. Singhal, K. Kendall, High-temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications, Mater. Today, 5(12) (2002) 55.

[7] F.Y. Wang, G.B. Jung, A. Su, et al, Porous Ag–Ce0. 8Sm0. 2O1. 9 cermets as anode materials for intermediate temperature solid oxide fuel cells using CO fuel, J. Power Sources, 185(2) (2008) 862-866.

DOI: 10.1016/j.jpowsour.2008.09.018

[8] D.S. Lee, J.H. Lee, J. Kim, et al, Tuning of the microstructure and electrical properties of SOFC anode via compaction pressure control during forming, Solid State Ionics, 166(1-2) (2004) 13-17.

DOI: 10.1016/j.ssi.2003.10.003

[9] X. Liu, C.L. Martin, G. Delette, et al, Microstructure of porous composite electrodes generated by the discrete element method, J. Power Sources, 196(4) (2011) 2046-(2054).

DOI: 10.1016/j.jpowsour.2010.09.033

[10] M.F. Han, H.Y. Yin, W.T. Miao, et al, Fabrication and properties of anode-supported solid oxide fuel cell, Solid State Ionics, 179(27-32) (2008) 1545–1548.

DOI: 10.1016/j.ssi.2008.02.035

[11] M. Kim, J. Lee, J.H. Han, Fabrication of anode support for solid oxide fuel cell using zirconium hydroxide as a pore former, J. Power Sources, 196(5) (2011) 2475-2482.

DOI: 10.1016/j.jpowsour.2010.10.109

[12] L.F. Nie, J.C. Liu, Y.J. Zhang, et al, Effects of pore formers on microstructure and performance of cathode membranes for solid oxide fuel cells, J. Power Sources, 196(23) (2011) 9975-9979.

DOI: 10.1016/j.jpowsour.2011.08.036

[13] J. J Yang, W.H. Ma, J. Yu, et al, Study on the Pore-formers for Porous Anode Substrates of Solid Oxide Fuel Cell, Rare Metal Mater. Eng. 43(2) (2014) 269-273.

DOI: 10.1016/s1875-5372(14)60056-4

[14] R.H. Amir, T. Alireza, H.E. Thomas, et al, Porous electrolyte-supported tubular micro-SOFC design, Solid State Ionics, 192(1) (2011) 368-371.

DOI: 10.1016/j.ssi.2010.07.010

[15] A. Sanson, P. Pinasco, E. Roncari, Influence of pore formers on slurry composition and microstructure of tape cast supporting anodes for SOFCs, J. Eur. Ceram. Soc. 28(6) (2008) 1221-1226.

DOI: 10.1016/j.jeurceramsoc.2007.10.001

[16] C.M. An, J.H. Song, I. Kang, et al. The effect of porosity gradient in a Nickel/Yttria Stabilized Zirconia anode foran anode-supported planar solid oxide fuel cell, J. Power Sources, 195(195) (2010) 821-824.

DOI: 10.1016/j.jpowsour.2009.08.043

[17] B.A. Horri, C. Selomulya, H.T. Wang, Electrochemical characteristics and performance of anode-supported SOFCs fabricated using carbon microspheres as a pore-former, Int. J. Hydrogen Energ. 37(24) (2012) 19045-19054.

DOI: 10.1016/j.ijhydene.2012.10.005

[18] W.P. Pan, Z. Lü, K.F. Chen, et al, Novel polymer fibers prepared by electrospinning for use as the pore-former for the anode of solid oxide fuel cell, Electrochimica. Acta. 55(20) (2010) 5538-5544.

DOI: 10.1016/j.electacta.2010.04.037

[19] H.X. You, A. Abuliti, X.W. Ding, et al, Reactions of Low and Middle Concentration Dry Methane over Ni/ YSZ Anode of Solid Oxide Fuel Cell, J. Power Sources, 165(2) (2007) 722-727.

DOI: 10.1016/j.jpowsour.2006.12.041