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<p>The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. The stability of the electrode is closely linked to the effective evacuation of H<sub>2</sub> or O<sub>2</sub> gas generated from electrode surface during the electrolysis. In this study, we prepared a super-hydrophilic electrode by depositing porous nickel–iron nanoparticles on annealed TiO<sub>2</sub> nanotubes (NiFe/ATNT) for rapid outgassing of such nonpolar gases. The super-hydrophilic NiFe/ATNT electrode exhibited an overpotential of 235&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> for oxygen evolution reaction in 1.0&#xa0;M KOH solution, and was utilized as the anode in the AEMWE to achieve a current density of 1.67&#xa0;A&#xa0;cm<sup>−2</sup> at 1.80&#xa0;V. In addition, the AEMWE with NiFe/ATNT electrode, which enables effective outgassing, showed record stability for 1500&#xa0;h at 0.50&#xa0;A&#xa0;cm<sup>−2</sup> under harsh temperature conditions of 80 ± 3&#xa0;°C.</p>

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Rapid Outgassing of Hydrophilic TiO2 Electrodes Achieves Long-Term Stability of Anion Exchange Membrane Water Electrolyzers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月13日

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  • Shajahan Shaik,
  • Jeonghyeon Kim,
  • Mrinal Kanti Kabiraz,
  • Faraz Aziz,
  • Joon Yong Park,
  • Bhargavi Rani Anne,
  • Mengfan Li,
  • Hongwen Huang,
  • Ki Min Nam,
  • Daeseong Jo,
  • Sang-Il Choi

摘要

The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. The stability of the electrode is closely linked to the effective evacuation of H2 or O2 gas generated from electrode surface during the electrolysis. In this study, we prepared a super-hydrophilic electrode by depositing porous nickel–iron nanoparticles on annealed TiO2 nanotubes (NiFe/ATNT) for rapid outgassing of such nonpolar gases. The super-hydrophilic NiFe/ATNT electrode exhibited an overpotential of 235 mV at 10 mA cm−2 for oxygen evolution reaction in 1.0 M KOH solution, and was utilized as the anode in the AEMWE to achieve a current density of 1.67 A cm−2 at 1.80 V. In addition, the AEMWE with NiFe/ATNT electrode, which enables effective outgassing, showed record stability for 1500 h at 0.50 A cm−2 under harsh temperature conditions of 80 ± 3 °C.