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<p>Introducing lattice defects represents a potent strategy to boost the electrocatalytic performance of metal nanoparticles (NPs) toward the hydrogen evolution reaction (HER). In this work, lattice distortion defect-rich Au NPs (Defect-Au NPs) is prepared via a non-equilibrium laser irradiation method. The lattice distortion defects induced strain effect in Defect-Au NPs could generate more exposed active sites and enhance the adsorption of H* intermediates, synergistically accelerating the reaction kinetics and promoting electrocatalytic HER activity. Leveraging this optimized defect configuration, Defect-Au NPs demonstrate an enhanced HER activity, which achieves a much lower overpotential of 185 mV at 10&#xa0;mA cm<sup>–2</sup> in 0.5 M H<sub>2</sub>SO<sub>4</sub> compare to Bulk Au (407 mV@10&#xa0;mA cm<sup>–2</sup>) and Au NPs without lattice defects (Defect free-Au NPs, 317 mV@10&#xa0;mA cm<sup>–2</sup>). More importantly, Defect-Au NPs also present high electrocatalytic stability for over 50&#xa0;h at a current density of 50&#xa0;mA cm<sup>–2</sup> without activity degradation, while post-reaction characterization confirms its structural stability with well-retained lattice distortion and strain. This work pioneers an innovative approach for designing highly efficient electrocatalysts towards diverse applications.</p> Graphical Abstract

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Laser-Synthesized Defect-Rich Gold Nanoparticles with Exclusive Strain Effect for Enhanced Electrocatalytic Hydrogen Evolution

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Yang Hu,
  • Chao Zhang,
  • Songbai Qiu

摘要

Introducing lattice defects represents a potent strategy to boost the electrocatalytic performance of metal nanoparticles (NPs) toward the hydrogen evolution reaction (HER). In this work, lattice distortion defect-rich Au NPs (Defect-Au NPs) is prepared via a non-equilibrium laser irradiation method. The lattice distortion defects induced strain effect in Defect-Au NPs could generate more exposed active sites and enhance the adsorption of H* intermediates, synergistically accelerating the reaction kinetics and promoting electrocatalytic HER activity. Leveraging this optimized defect configuration, Defect-Au NPs demonstrate an enhanced HER activity, which achieves a much lower overpotential of 185 mV at 10 mA cm–2 in 0.5 M H2SO4 compare to Bulk Au (407 mV@10 mA cm–2) and Au NPs without lattice defects (Defect free-Au NPs, 317 mV@10 mA cm–2). More importantly, Defect-Au NPs also present high electrocatalytic stability for over 50 h at a current density of 50 mA cm–2 without activity degradation, while post-reaction characterization confirms its structural stability with well-retained lattice distortion and strain. This work pioneers an innovative approach for designing highly efficient electrocatalysts towards diverse applications.

Graphical Abstract