Scandurra Antonino, Censabella Maria, Gulino Antonino, Grimaldi Maria Grazia, Ruffino Francesco
Department of Physics and Astronomy "Ettore Majorana", University of Catania, Via Santa Sofia 64, 95123 Catania, Italy.
Institute for Microelectronics and Microsystems of National Research Council of Italy (CNR-IMM), Via Santa Sofia 64, 95123 Catania, Italy.
Micromachines (Basel). 2022 Jun 18;13(6):963. doi: 10.3390/mi13060963.
Sustainable and renewable production of hydrogen by water electrolysers is expected to be one of the most promising methods to satisfy the ever-growing demand for renewable energy production and storage. Hydrogen evolution reaction in alkaline electrolyte is still challenging due to its slow kinetic properties. This study proposes new nanoelectrode arrays for high Faradaic efficiency of the electro-sorption reaction of hydrogen in an alkaline electrolyte. A comparative study of the nanoelectrode arrays, consisting of platinum or palladium or bimetallic nanoparticles (NPs) PtPd (wt.%), obtained by nanosecond pulsed laser ablation in aqueous environment, casted onto graphene paper, is proposed. The effects of thin films of perfluoro-sulfonic ionomer on the material morphology, nanoparticles dispersion, and electrochemical performance have been investigated. The NPs-GP systems have been characterized by field emission scanning electron microscopy, Rutherford backscattering spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge cycles. Faradaic efficiency up to 86.6% and hydrogen storage capacity up to 6 wt.% have been obtained by the Pt-ionomer and Pd/PtPd systems, respectively.
通过水电解槽可持续和可再生地生产氢气，有望成为满足对可再生能源生产和存储不断增长需求的最具前景的方法之一。由于其缓慢的动力学特性，碱性电解质中的析氢反应仍然具有挑战性。本研究提出了用于在碱性电解质中实现高效法拉第效率的氢电吸附反应的新型纳米电极阵列。建议对通过纳秒脉冲激光烧蚀在水环境中获得、并浇铸到石墨烯纸上的由铂或钯或双金属纳米颗粒（NPs）PtPd（重量%）组成的纳米电极阵列进行对比研究。研究了全氟磺酸离聚物薄膜对材料形态、纳米颗粒分散和电化学性能的影响。通过场发射扫描电子显微镜、卢瑟福背散射光谱、X射线衍射、X射线光电子能谱、循环伏安法和恒电流充放电循环对NPs-GP系统进行了表征。Pt-离聚物和Pd/PtPd系统分别获得了高达86.6%的法拉第效率和高达6 wt.%的储氢容量。
