Characterization of LSCF Cathode Material Modified with f-CNTs

Abstract:

Cathode is one of the important parts in performing the high efficiency of proton conducting fuel cell (PCFC). Selection of appropriate cathode material may resolve the major drawbacks at the cathode part associated with the high R_p. Accordingly, tremendous effort have been done to reduce the R_p and one of the alternatives is the modification of cathode microstructure that can be achieved by introducing dispersing agent in the synthesis route. Thus, in this present work, a functionalized carbon nanotubes (f-CNTs) obtained from acidification process was used as a dispersing agent in the synthesis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) cathode material. The amount of 4 mg, 8 mg and 12 mg of f-CNTs were respectively added to LSCF cathode during the synthesizing process by a sol-gel method. Semi-solid gel obtained was calcined at 900 °C to form high purity of LSCF powder and respectively denoted as LSCF4, LSCF8 and LSCF12. The powder was characterized by Fourier Transform Infrared (FTIR) Spectroscopy, Pycnometer, Particle Size Analyzer and Scanning Electron Microscopy with Energy Dispersive X-ray (SEM/EDX). The FTIR analysis depicted the peak of respective metal complexes, metal oxide, symmetrical and asymmetrical stretching of carboxylate. The pycnometer showed the lowest density of LSCF4 was 2.8777 g/cm³. The Particles Size Analyzer confirmed the particle size of 38 nm ultrafine powder for LSCF4. The SEM image depicted the highly disperse spherical particles found in LSCF4 with particle size about 30 nm. The elemental composition of the samples is comparable with the nominal stoichiometric of LSCF4 as corroborated by the EDX analysis. Therefore, the LSCF with optimum 4 mg f-CNTs as dispersing agent has potential as nanoporous cathode material for proton conductivity fuel cell.

• Periodical: Solid State Phenomena (Volume 307)
• Pages: 154-159
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.307.154
• Online since: July 2020
• Authors: Nurul Izzati Abd Malek, Ismariza Ismail, Nafisah Osman
• Keywords: Dispersing Agent, f-CNTs, LSCF Cathode, Sol-Gel

References

[1] Ismail, I., et al., Outstanding performance of novel cathode button cell for intermediate temperature proton conducting fuel cell (PCFC). International Innovation, Design and Articulation i-IDeA, 2018. 1: pp.200-203.

[2] Habiballah, A.S., et al., The next generation of solid oxide fuel cells: Integration of perovskite nanotubes and spin coating film for high perfomance cell. International Innovation, Design and Articulation i-IDeA, 2018. 1: pp.209-212.

[3] Ma, P.C., J.K. Kim, and B.Z. Tang, Effect of silane functionalization on properties of carbon nanotube/epoxy nanocomposites. (2007).

[4] Santillaan, M.J., et al., Electrophoretic codeposition of La0.6Sr0.4Co0.8Fe0.2O and carbon nanotubes for developing composite cathodes for intermediate temperature solid oxide fuel cells. International Journal of Applied Ceramic Technology, 2010. 7(1): pp.30-40.

DOI: 10.1111/j.1744-7402.2009.02413.x

[5] Buang, N.A., et al., Characteristics of mild acid functionalized multiwalled carbon nanotubes towards high dispersion with low structural defect. Digest Journal of Nanomaterials and Biostructures, 2012. 7(1): pp.33-39.

[6] N.A. Abdullah, S. Hassan, N. Osman, Role of CA-EDTA on the Synthesizing Process of Cerate-Zirconate Ceramics Electrolyte. Journal of Chemistry, 2013. 1: pp.1-7.

DOI: 10.1155/2013/908340

[7] Nurul Akidah Baharuddin, Andanastuti Muchtar, Mahendra Rao Somalu, Abdullah Abdul Samat, Thermal Decomposition of Cobalt-free SrFe0.9Ti0.1O3-δ Cathode for Intermediate Temperature Solid Oxide Fuel Cell. Procedia Engineering, 2016. 148: 72-77.

DOI: 10.1016/j.proeng.2016.06.502

[8] N.A. Mazlan, N. Osman, A.M.M. Jani, M.H. Yaakob, Role of ionic and nonionic surfactant on the phase formation and morphology of Ba(Ce,Zr)O3 solid solution, J Sol-Gel Sci Technol, 2016. 78(1): pp.50-59.

DOI: 10.1007/s10971-015-3938-3

[9] Jing Shao, Youkun Tao, JianxinWang, Cheng Xu,Wei GuoWang, Investigation of precursors in the preparation of nanostructured La0.6Sr0.4Co0.2Fe0.8O3-δ via a modified combined complexing method. Journal of Alloys and Compounds, 2009. 484: 263-267.

DOI: 10.1016/j.jallcom.2009.04.075

[10] Ismail, I., N. Osman, and A.M. Md Jani, Tailoring the microstructure of La0.6Sr0.4Co0.2Fe0.8O3−α cathode material: the role of dispersing agent. Journal of Sol-Gel Science and Technology, 2016. 80(2): pp.259-266.

DOI: 10.1007/s10971-016-4102-4