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<p>The efficient and sustainable generation of hydrogen from chemical hydrides is hindered by slow reaction kinetics and the high cost of conventional noble-metal catalysts. In this study, an AgNP@CNT nanocomposite was synthesized by a green, plant-extract-assisted method and applied as a catalyst for hydrogen production via sodium borohydride (NaBH₄) methanolysis, together with antibacterial evaluation. The AgNP@CNT nanocomposite was systematically characterized using UV–Vis, FT-IR, Raman, XRD, SEM-EDX, and TEM techniques. Its catalytic performance in NaBH₄ methanolysis was investigated through kinetic and thermodynamic analyses, revealing a low apparent activation energy of 15.336&#xa0;kJ/mol, an enthalpy change (ΔH) of 12.779&#xa0;kJ/mol, and an entropy change (ΔS) of − 92.518&#xa0;J/mol·K. The CNT support facilitated uniform dispersion of AgNP nanoparticles and enhanced catalytic activity by increasing the accessibility of active sites. Reusability tests indicated moderate catalytic stability, with partial deactivation observed after repeated cycles. In addition to hydrogen generation, the AgNP@CNT nanocomposite exhibited dose-dependent antibacterial activity against both Gram-negative and Gram-positive bacteria. Although control experiments were not included, the results indicate the multifunctional potential of the AgNP@CNT system. The novelty of this work lies in the combination of an environmentally benign synthesis route with a dual-function AgNP@CNT nanocomposite designed for hydrogen production and environmental applications. In addition, the plant-extract-assisted synthesis route and the efficient hydrogen generation under mild conditions highlight the sustainable and cost-effective nature of the AgNP@CNT catalytic system with minimized environmental impact.</p>

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Enhanced hydrogen evolution and antibacterial activity through AgNP@CNT nanocomposite structure

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Yasemin Torlak

摘要

The efficient and sustainable generation of hydrogen from chemical hydrides is hindered by slow reaction kinetics and the high cost of conventional noble-metal catalysts. In this study, an AgNP@CNT nanocomposite was synthesized by a green, plant-extract-assisted method and applied as a catalyst for hydrogen production via sodium borohydride (NaBH₄) methanolysis, together with antibacterial evaluation. The AgNP@CNT nanocomposite was systematically characterized using UV–Vis, FT-IR, Raman, XRD, SEM-EDX, and TEM techniques. Its catalytic performance in NaBH₄ methanolysis was investigated through kinetic and thermodynamic analyses, revealing a low apparent activation energy of 15.336 kJ/mol, an enthalpy change (ΔH) of 12.779 kJ/mol, and an entropy change (ΔS) of − 92.518 J/mol·K. The CNT support facilitated uniform dispersion of AgNP nanoparticles and enhanced catalytic activity by increasing the accessibility of active sites. Reusability tests indicated moderate catalytic stability, with partial deactivation observed after repeated cycles. In addition to hydrogen generation, the AgNP@CNT nanocomposite exhibited dose-dependent antibacterial activity against both Gram-negative and Gram-positive bacteria. Although control experiments were not included, the results indicate the multifunctional potential of the AgNP@CNT system. The novelty of this work lies in the combination of an environmentally benign synthesis route with a dual-function AgNP@CNT nanocomposite designed for hydrogen production and environmental applications. In addition, the plant-extract-assisted synthesis route and the efficient hydrogen generation under mild conditions highlight the sustainable and cost-effective nature of the AgNP@CNT catalytic system with minimized environmental impact.