Multi-fold catalytic activities of Ni nanoparticles supported on TiN for improving the hydrogen storage of NaAlH4

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Ning Ma , Xiaobo Ma , Ling Ma , Xiaomeng Wang , Zhijie Cao
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Abstract

The high desorption temperature and sluggish kinetics of NaAlH4 limit its applications in hydrogen storage. To address these issues, a Ni nanoparticles-loaded TiN composite catalyst with excellent thermodynamic stability and catalytic activity was constructed. The addition of 5 wt% Ni10@TiN reduced the initial dehydrogenation temperature of NaAlH4 to 81 °C, and a total amount of 5.4 wt% H2 could be released within 20 min at 170 °C. The activation energies for the two-step dehydrogenations were significantly reduced to 66.3 kJ/mol and 81.4kJ/mol, respectively, which were 43 % and 36 % lower than that of pure NaAlH4. Experimental results and theoretical calculations suggested that these remarkable improvements were originated from the grain refinement of NaAlH4 and multi-fold catalytic activities of Ni10@TiN catalyst like providing catalytic active sites, facilitating the breaking of Al-H and H-H bonds, and increasing hydrogen diffusion channels. These findings may offer new ideas for designing high-efficiency catalysts for solid-state hydrogen storage materials.

Abstract Image

Abstract Image

TiN负载的Ni纳米颗粒对NaAlH4储氢性能的多重催化活性研究
NaAlH4的解吸温度高、动力学慢,限制了其在储氢领域的应用。为了解决这些问题,构建了一种具有优异的热力学稳定性和催化活性的Ni纳米颗粒负载TiN复合催化剂。5 wt% Ni10@TiN的加入使NaAlH4的初始脱氢温度降低到81 ℃,在170 ℃下,在20 min内可以释放出5.4 wt%的H2。两步脱氢活化能分别为66.3 kJ/mol和81.4kJ/mol,比纯NaAlH4的活化能分别降低了43 %和36 %。实验结果和理论计算表明,这些显著的改善源于NaAlH4的晶粒细化和Ni10@TiN催化剂的多重催化活性,如提供催化活性位点,促进Al-H和H-H键的断裂,增加氢的扩散通道。这些发现可能为设计固态储氢材料的高效催化剂提供新的思路。
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
文献相关原料
公司名称
产品信息
阿拉丁
nickel acetate
阿拉丁
nickel acetate
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