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On the role of the silica-containing catalyst layer for proton exchange membrane fuel cells

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  • Jung, Chi-Young
  • Yi, Jae-You
  • Yi, Sung-Chul

Abstract

The performance of a PEMFC (proton exchange membrane fuel cell) severely decreases as the relative humidity decreases. Herein, we present size-controlled SiO2 (silica) nanoparticles in the CLs (catalyst layers) to provide sufficient water to the Nafion ionomer. It is found that the microstructure of the agglomerated CL is notably improved using the SiO2 particles with smaller diameter. In addition, as the SiO2 particle diameter decreases, both the electrochemical surface area and ohmic performance are improved, as well as the wettability, for the PEMFC application. The highest performance is achieved for the CL with the 8 nm SiO2 particle, which results in 2.93 times increased current density at 0.5 V relative to the 80 nm SiO2-containing CL, when SiO2-to-carbon ratio was fixed to 0.20. Consequently, it is more effective to improve the electrode morphology of the SiO2 CL than simply increase the SiO2 content, in order to enhance the fuel-cell performance under low relative humidity.

Suggested Citation

  • Jung, Chi-Young & Yi, Jae-You & Yi, Sung-Chul, 2014. "On the role of the silica-containing catalyst layer for proton exchange membrane fuel cells," Energy, Elsevier, vol. 68(C), pages 794-800.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:794-800
    DOI: 10.1016/j.energy.2014.03.009
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    References listed on IDEAS

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    1. Mark K. Debe, 2012. "Electrocatalyst approaches and challenges for automotive fuel cells," Nature, Nature, vol. 486(7401), pages 43-51, June.
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    4. Lakshminarayana, G. & Nogami, Masayuki & Kityk, I.V., 2010. "Synthesis and characterization of anhydrous proton conducting inorganic–organic composite membranes for medium temperature proton exchange membrane fuel cells (PEMFCs)," Energy, Elsevier, vol. 35(12), pages 5260-5268.
    5. Carton, J.G. & Lawlor, V. & Olabi, A.G. & Hochenauer, C. & Zauner, G., 2012. "Water droplet accumulation and motion in PEM (Proton Exchange Membrane) fuel cell mini-channels," Energy, Elsevier, vol. 39(1), pages 63-73.
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    1. Yang, H.N. & Lee, W.H. & Choi, B.S. & Ko, Y.D. & Yi, S.C. & Kim, W.J., 2017. "Self-humidifying Pt-C/Pt-TiO2 dual-catalyst electrode membrane assembly for proton-exchange membrane fuel cells," Energy, Elsevier, vol. 120(C), pages 12-19.

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