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<p>The real-time detection of hydrogen permeation presents a critical challenge in maintaining structural integrity of energy infrastructure exposed to hydrogen environments. We demonstrate an innovative hydrogen-responsive sensing platform employing nickel-enhanced poly(2,5-dimethoxyaniline) (PDMA) films with tunable chromogenic responses, and that was systematically optimized through three key operational parameters: nickel surface modification, temperature modulation (25–45&#xa0;°C), and hydrogenation current density (1–8&#xa0;mA/cm<sup>2</sup>). Experimental results demonstrate that the nickel coating significantly enhances the hydrogen sensitivity of PDMA films. The brightness change value (ΔY) increased from 0 to 77.449 for the nickel-coated film, compared to 0–70.0764 for the uncoated counterpart, indicating a more pronounced yellow chromogenic response. Elevating permeation temperature or hydrogenation current density can expedite color change, which increased the hydrogen atoms adsorbed on the steel surface. In other words, a greater concentration gradient prompted more hydrogen atoms to enter the interior of the substrate, thereby increasing the hydrogen flux and accelerating the hydrogen diffusion rate. These insights provide a refined approach to hydrogen detection, and the advancement is crucial for safeguarding infrastructure, particularly pipelines, against the substantial risks of hydrogen-induced damage.</p>

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A permeated hydrogen monitoring method based on poly(2,5-dimethoxyaniline) hydrogenochromic films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月4日

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  • Tian Yuan,
  • Wen Shaomu,
  • Yan Jing,
  • Xu Lei,
  • Wang Yongbo

摘要

The real-time detection of hydrogen permeation presents a critical challenge in maintaining structural integrity of energy infrastructure exposed to hydrogen environments. We demonstrate an innovative hydrogen-responsive sensing platform employing nickel-enhanced poly(2,5-dimethoxyaniline) (PDMA) films with tunable chromogenic responses, and that was systematically optimized through three key operational parameters: nickel surface modification, temperature modulation (25–45 °C), and hydrogenation current density (1–8 mA/cm2). Experimental results demonstrate that the nickel coating significantly enhances the hydrogen sensitivity of PDMA films. The brightness change value (ΔY) increased from 0 to 77.449 for the nickel-coated film, compared to 0–70.0764 for the uncoated counterpart, indicating a more pronounced yellow chromogenic response. Elevating permeation temperature or hydrogenation current density can expedite color change, which increased the hydrogen atoms adsorbed on the steel surface. In other words, a greater concentration gradient prompted more hydrogen atoms to enter the interior of the substrate, thereby increasing the hydrogen flux and accelerating the hydrogen diffusion rate. These insights provide a refined approach to hydrogen detection, and the advancement is crucial for safeguarding infrastructure, particularly pipelines, against the substantial risks of hydrogen-induced damage.