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Advances in Energy Research Volume 2, Number 2, June 2014 , pages 105-106 DOI: https://doi.org/10.12989/eri.2014.2.2.105 |
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Nanoporous silicon-based ammonia-fed fuel cells |
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Tayyar D. Dzhafarov, Sureyya Aydin Yuksel and Mustafa Aydin
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| Abstract | ||
| The paper is devoted to fabrication and investigation of structural, morphological and performance characteristics of novel TiO2/PS/Si, Au/TiO2/PS/Si and Au/PS/Si direct ammonia fuel cells (DAFC) using nanoporous silicon (PS) as proton conducting membrane (instead of traditional polymer Nafion membrane) and TiO2, Au/TiO2 or Au as catalyst layer. Porous silicon layers have been prepared by electrochemical modification of silicon substrates. Films containing titanium dioxide are more efficient catalysts for hydrogen production from ammonia solution. The Au/TiO2/PS/Si cell exhibited the open circuit voltage 0.87 V and performance of 1.6 mW/cm2 with 50 % ammonia solution as fuel at room temperature. Mechanisms of proton transport in nanoporous silicon membrane and generation of electricity in DAFC have been considered. Advantages of investigated direct ammonia fuel cells in compared with direct methanol fuel cell (DMFC) and solid oxide fuel cells (SOFC) consist in simplicity and low cost of fabrication technology of nanoporous silicon and titanium dioxide catalyst layers which can be integrated into standard silicon micro fabrication processes and operation of cells at room temperature. The work demonstrates that the PS based fuel cells have potential for portable applications. | ||
| Key Words | ||
| Nanoporous silicon membrane; fuel cell; Au/TiO2 catalyst; ammonia electrolyte; power density; PACS: 88:30-k | ||
| Address | ||
| Tayyar D. Dzhafarov: Institute of Physics, Azerbaijan National Academy of Sciences, AZ-1143 Baku, Azerbaijan Sureyya Aydin Yuksel and Mustafa Aydin: Department of Physics, Yildiz Technical University, 34210 Esenler, Istanbul, Turkey | ||
