Ali Shimaa M
Chemistry Department, Faculty of Science, Cairo University, P.O. 12613, Giza, Egypt.
Sci Rep. 2025 Feb 7;15(1):4602. doi: 10.1038/s41598-024-84727-z.
Green hydrogen is gaining a significant attention in the transition to sustainable energy and achieving net-zero emissions. Platinum-based catalysts are highly regarded in hydrogen production, particularly due to their efficiency in water electrolysis. Platinum nanoparticles (Pt NPs) is successively prepared by the microwave-assistant citrate method on a biomass-based support, and characterized by X-rays diffraction, scanning and transmission electron microscopy. The chelation and gelation resulted by using citric acid during the synthesis lead to the formation of highly stabilized and dispersed Pt NPs on the carbon support. The electrocatalytic activity of Pt NPs for the hydrogen evolution reaction (HER) is examined by cathodic linear polarization and impedance spectroscopy. A high catalytic performance is shown by the prepared sample, as indicated by the calculated exchange current density 5.3 mA/cm, and activation energy, 38.13 kJ/mol. The HER follows Volmer/Tafel mechanism with a reaction order of unity. Impedance spectra confirms the high electrocatalytic activity by the decrease of the total impedance, pore resistance, and charge-transfer resistance, with increasing the applied overpotential. The proposed synthesis method offers a green, economic, and efficient route for preparing precious metals used for catalytic applications.
绿色氢能在向可持续能源转型和实现净零排放方面正受到广泛关注。基于铂的催化剂在制氢领域备受青睐，特别是因其在水电解方面的高效性。通过微波辅助柠檬酸盐法在生物质基载体上连续制备铂纳米颗粒（Pt NPs），并通过X射线衍射、扫描和透射电子显微镜对其进行表征。合成过程中使用柠檬酸导致的螯合和凝胶化作用，使得在碳载体上形成了高度稳定且分散的Pt NPs。通过阴极线性极化和阻抗谱研究了Pt NPs对析氢反应（HER）的电催化活性。所制备的样品表现出较高的催化性能，计算得到的交换电流密度为5.3 mA/cm，活化能为38.13 kJ/mol。HER遵循Volmer/Tafel机制，反应级数为1。阻抗谱证实，随着施加过电位的增加，总阻抗、孔电阻和电荷转移电阻降低，从而表明具有较高的电催化活性。所提出的合成方法为制备用于催化应用的贵金属提供了一条绿色、经济且高效的途径。
