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Preparation of Nanoporous PdIrZn Alloy Catalyst by Dissolving Excess ZnO for Cathode of High- Temperature Polymer Electrolyte Membrane Fuel Cells

Author

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  • Dae Jong You

    (Department of Chemistry, Sungkyunkwan University, Suwon 16419, Korea
    Fuel Cell Engineering Team, Hyundai Mobis Co. Ltd., Yongin 16891, Korea)

  • Do-Hyung Kim

    (Graduate Program of Energy Technology, School of Integrated Technology, Institute of Integrated Technology, Gwangju Institute of Science and Technology, Gwangju 61005, Korea)

  • Ji Man Kim

    (Department of Chemistry, Sungkyunkwan University, Suwon 16419, Korea)

  • Chanho Pak

    (Graduate Program of Energy Technology, School of Integrated Technology, Institute of Integrated Technology, Gwangju Institute of Science and Technology, Gwangju 61005, Korea)

Abstract

Carbon-supported nanoporous palladium-iridium–zinc (NP-PdIrZn) electrocatalyst was prepared through the modification of the alcohol-reduction process following the selective dissolution of excess ZnO nanoparticles using NaOH solution. The electrocatalyst was applied successfully to the cathode for a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC). X-ray diffraction (XRD) patterns of the NP-PdIrZn nanoparticles suggests formation of the ternary alloy and complete removal of ZnO without the formation of individual Pd, Ir, or Zn nanoparticles. Moreover, transmission electron microscopy (TEM) images displayed porous nanoparticles with an irregular shape, which was generated by removing the ZnO from the PdIrZn–ZnO nanocomposites, and was prepared by using the excessive Zn precursor. The electrochemical surface area (ECSA) of the NP-PdIrZn catalysts was estimated by cyclic voltammetry using a rotating disk electrode method , and the oxygen reduction reaction (ORR) activity was evaluated by a linear sweep method. The NP-PdIrZn catalysts showed larger ECSA and higher ORR activity than those of the PdIr and PdIrZn catalysts, which may be attributed to the increased exposed surface area by selective etching of the ZnO in the composites. Furthermore, the NP-PdIrZn catalyst exhibited excellent performance (0.66 V) in a single cell under the HT-PEMFC condition than those of the PdIr (0.58 V) and PdIrZn (0.62 V) catalysts, indicating that geometric and electronic control of Pd-based alloy can improve the single-cell performance for the HT-PEMFC.

Suggested Citation

  • Dae Jong You & Do-Hyung Kim & Ji Man Kim & Chanho Pak, 2019. "Preparation of Nanoporous PdIrZn Alloy Catalyst by Dissolving Excess ZnO for Cathode of High- Temperature Polymer Electrolyte Membrane Fuel Cells," Energies, MDPI, vol. 12(21), pages 1-11, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4155-:d:281964
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    References listed on IDEAS

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    1. Kyungho Hwang & Jun-Hyun Kim & Sung-Yul Kim & Hongsik Byun, 2014. "Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System," Energies, MDPI, vol. 7(3), pages 1-12, March.
    2. Hyun Sung Kang & Yoon Hyuk Shin, 2019. "Analytical Study of Tri-Generation System Integrated with Thermal Management Using HT-PEMFC Stack," Energies, MDPI, vol. 12(16), pages 1-17, August.
    3. Geonhui Gwak & Minwoo Kim & Dohwan Kim & Muhammad Faizan & Kyeongmin Oh & Jaeseung Lee & Jaeyoo Choi & Nammin Lee & Kisung Lim & Hyunchul Ju, 2019. "Performance and Efficiency Analysis of an HT-PEMFC System with an Absorption Chiller for Tri-Generation Applications," Energies, MDPI, vol. 12(5), pages 1-21, March.
    4. Jonah Erlebacher & Michael J. Aziz & Alain Karma & Nikolay Dimitrov & Karl Sieradzki, 2001. "Evolution of nanoporosity in dealloying," Nature, Nature, vol. 410(6827), pages 450-453, March.
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