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<p>Alkaline water electrolysis (AWE) is considered to be a core technology for green hydrogen production given its reasonable cost-effectiveness and approachability. However, the large activation loss from the hydrogen evolution reaction (HER) still hinders high efficiency of the resulting devices. Here, we apply ultrasonic-assisted dynamic hydrogen bubble templating (U-DHBT) technology over electrodeposition to improve the HER of the Ni electrodes used in alkaline electrolysis. We verified that the ultrasonic fields offer a facile fabrication of a 3D hierarchical porous structure, exhibiting an enlarged electrochemical active area and HER kinetics. The Ni foam with the deposited U-DHBT exhibits 30 ~ 60% lower overvoltage of 126 mV compared to those of bare Ni foam (150 mV) and the Electrodeposition (165 mV) and immersed samples (210 mV) at a current density of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:-\)</EquationSource> </InlineEquation>10&#xa0;mA/cm². While bare Ni exhibits a degradation rate of 2.44 mV/h, the U-DHBT electrode shows a significantly lower rate of 0.98 mV/h, demonstrating superior stability over 50&#xa0;h of operation. This study provides a promising strategy by which to engineer nanostructures to improve the performance of electrochemical devices as well as AWE.</p>

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Nano-structure Engineering With an Ultrasonic-assisted DHBT Technique to Improve the Hydrogen Evolution Reactions in Alkaline Water Electrolysis

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Hoseob Lee,
  • Eunbi Hong,
  • Hyunho Lee,
  • Sojeong Eun,
  • Chaewon Lee,
  • Minseon Kwak,
  • Mingi Choi

摘要

Alkaline water electrolysis (AWE) is considered to be a core technology for green hydrogen production given its reasonable cost-effectiveness and approachability. However, the large activation loss from the hydrogen evolution reaction (HER) still hinders high efficiency of the resulting devices. Here, we apply ultrasonic-assisted dynamic hydrogen bubble templating (U-DHBT) technology over electrodeposition to improve the HER of the Ni electrodes used in alkaline electrolysis. We verified that the ultrasonic fields offer a facile fabrication of a 3D hierarchical porous structure, exhibiting an enlarged electrochemical active area and HER kinetics. The Ni foam with the deposited U-DHBT exhibits 30 ~ 60% lower overvoltage of 126 mV compared to those of bare Ni foam (150 mV) and the Electrodeposition (165 mV) and immersed samples (210 mV) at a current density of \(\:-\) 10 mA/cm². While bare Ni exhibits a degradation rate of 2.44 mV/h, the U-DHBT electrode shows a significantly lower rate of 0.98 mV/h, demonstrating superior stability over 50 h of operation. This study provides a promising strategy by which to engineer nanostructures to improve the performance of electrochemical devices as well as AWE.