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Nano-Pd loaded composite membrane for reduced hydrogen crossover in proton exchange membrane water electrolysis via recasting method

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  • Xu, Guizhi
  • Du, Xiaoze
  • Ding, Wenjie
  • Ma, Sai
  • Zhang, Liang
  • Li, Jun
  • Huang, Jian
  • Song, Jie
  • Liang, Danxi

Abstract

The operation safety of proton exchange membrane water electrolysis (PEMWE) is significantly affected by hydrogen crossover. To address this issue, this study proposes a nano-Pd particle loaded composite membrane (Nafion-Pd) using the recasting method. Nafion-Pd and commercial membrane (Nafion-115) are comparatively studied in terms of the structure characteristics, proton conductivity, stability, electrolysis performance and hydrogen crossover. The results show that the Pd particles are relatively evenly distributed in Nafion-Pd, and the doped Pd particles have minor effect on the crystallinity and wettability of the membrane. Compared with Nafion-115, the composite membrane shows a slightly decreased ion exchange capacity but a significantly increased water absorption and hydration degree, which results in a 24.8 % increase in the proton conductivity. Although the mechanical stability of Nafion-Pd decreases to a certain extent, both the oxidative stability and thermal stability are improved. The electrolysis performance of PEMWE using Nafion-Pd is slightly improved, and the hydrogen crossover decreases significantly. Hydrogen concentration in oxygen is 0.66 % at 0.1 A/cm2, which is 60.2 % and 19.5 % lower compared with the Nafion 115 and Pt-doped composite membrane, respectively. The electrolytic voltage and hydrogen concentration in oxygen are relatively stable in long-time operation, ensuring an economic and safe operation of PEMWE.

Suggested Citation

  • Xu, Guizhi & Du, Xiaoze & Ding, Wenjie & Ma, Sai & Zhang, Liang & Li, Jun & Huang, Jian & Song, Jie & Liang, Danxi, 2024. "Nano-Pd loaded composite membrane for reduced hydrogen crossover in proton exchange membrane water electrolysis via recasting method," Renewable Energy, Elsevier, vol. 235(C).
    • Handle: RePEc:eee:renene:v:235:y:2024:i:c:s0960148124013533
    DOI: 10.1016/j.renene.2024.121285
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    References listed on IDEAS

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