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: ジャーナルへの寄稿記事

1 引用 (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.

元の言語英語
ページ(範囲)F246-F254
ジャーナルJournal of the Electrochemical Society
166
発行部数4
DOI
出版物ステータス出版済み - 1 1 2019

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Electrolysis
Two phase flow
Electrolytes
Numerical analysis
Polymers
Gases
Liquids
Electric potential
Temperature
Water
Anodes
Chemical activation
Catalysts
Pressurization
Current density
Membranes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

これを引用

Effect of temperature on the performance of polymer electrolyte membranewater electrolysis : Numerical analysis of electrolysis voltage considering gas/liquid two-phase flow. / Kai, Jyunya; Saito, Ryo; Terabaru, Kenji; Li, Hua; Nakajima, Hironori; Ito, Ohei.

:: Journal of the Electrochemical Society, 巻 166, 番号 4, 01.01.2019, p. F246-F254.

研究成果: ジャーナルへの寄稿記事

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