Effect of temperature on the performance of polymer electrolyte membranewater electrolysis: Numerical analysis of electrolysis voltage considering gas/liquid two-phase flow

Jyunya Kai, Ryo Saito, Kenji Terabaru, Hua Li, Hironori Nakajima, Ohei Ito

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

The numerical analysis conducted in this study proposes a guideline to maximize the higherature effect, which is expected to reduce the electrolysis voltage of the polymer electrolyte membrane water electrolyzer. Higherature operation is intuitively thought to reduce activation overvoltages. However, a further consideration predicts that high temperature, especially a temperature higher than the saturated temperature regulated in the operation pressure, decreases the liquid saturation and causes shortage of water, leading to a large increase in overvoltages. This high temperature problem is analyzed using the developed theoretical model, which considers gas/liquid behavior. The analysis suggests that, if the gas saturation in the anode catalyst layer is kept at or below 0.3 by increasing the pressure, liquid water in the catalyst layer is sufficient to OER catalytic ability regulated by exchange current density, demonstrating that the higherature effect works. According to this guideline, increasing the temperature with pressurization can monotonically reduce the anode activation overvoltage. For instance, raising the temperature from 100 to 120°C and raising the pressure from 0.13 to 0.22 MPa can prevent the gas saturation from increasing beyond 0.3 and allows the lower electrolysis voltage to vary from 1.57 to 1.51 V.

本文言語英語
ページ(範囲)F246-F254
ジャーナルJournal of the Electrochemical Society
166
4
DOI
出版ステータス出版済み - 2019

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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