Direct determination of the H2 absorption/desorption mechanism in Pd nanoparticles

IF 8.3 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Cynthia Cibaka-Ndaya , Nicolas Javahiraly , Jacques Jose , Lucian Roiban , Thierry Epicier , Arnaud Brioude
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引用次数: 0

Abstract

Palladium, well known for its high affinity with hydrogen, is a promising material for hydrogen storage or sensing applications. To develop such technologies, it is necessary to understand the interactions between palladium and hydrogen. Here, these interactions are studied at the nanoscale from thermodynamic and structural perspectives. In particular, with the aim of acquiring accurate and reliable data, this work shows the development of a new experimental method that allows direct assessment of the effective amount of hydrogen in Pd NPs during sorption processes, in contrast to most reported works that instead probe a parameter that is supposedly proportional to the composition. A custom gas chromatography apparatus was employed, making the proposed approach readily accessible in most materials research facilities. Furthermore, structural investigations by in operando electron energy loss spectroscopy revealed, for the first time, intermediate phases in the metallic to hydride (and reverse) transformations, challenging previously reported sharp phase transitions, thus suggesting a new understanding of the interaction mechanisms between Pd and H2 at the nanoscale. The results of this work advance the knowledge on palladium – hydrogen systems which can significantly contribute to the development of alternative energy sources.
钯纳米颗粒H2吸附/解吸机理的直接测定
钯以其与氢的高亲和性而闻名,是一种很有前途的储氢或传感材料。为了开发这种技术,有必要了解钯和氢之间的相互作用。在这里,从热力学和结构的角度在纳米尺度上研究了这些相互作用。特别是,为了获得准确可靠的数据,这项工作展示了一种新的实验方法的发展,该方法可以在吸附过程中直接评估Pd NPs中氢的有效量,而不是大多数报道的工作,而是探测一个据称与成分成正比的参数。采用了定制的气相色谱仪,使所提出的方法易于在大多数材料研究设施中使用。此外,通过in operando电子能量损失谱的结构研究首次揭示了金属向氢化物(和反向)转变的中间相,挑战了之前报道的急剧相变,从而提出了对纳米尺度Pd和H2之间相互作用机制的新认识。这项工作的结果促进了对钯氢体系的认识,这对替代能源的发展有重要的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
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