Free-standing 3D-printed monoliths of SrCl2 for ammonia storage as a hydrogen carrier

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-05-03 DOI:10.1016/j.ijhydene.2025.04.432

Nasir Shezad , Marco D'Agostini , Ali Ezzine , Giorgia Franchin , Paolo Colombo , Zhejian Cao , Farid Akhtar

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引用次数: 0

Abstract

The alkaline earth metal halides (AEMHs), such as strontium chloride (SrCl₂), are promising sorbents for hydrogen storage in the form of ammonia. However, these sorbents suffer from structural disintegration problems due to the extraordinary volume expansion during ammonia sorption. This study reports the fabrication of 3D-printed SrCl₂ monoliths scaffolded with bentonite using the direct ink writing technique. The optimized monolith with a 60 % SrCl₂ loading exhibited an ammonia storage capacity of 488 mg/g, maintaining remarkable structural integrity and effectively accommodating volumetric changes during sorption and desorption over 20 cycles. The kinetics data revealed that ammonia sorption followed a pseudo-second-order model, and intercrystalline diffusion was the rate-controlling step in the 3D-printed SrCl₂ structures. High-pressure sorption isotherms were explained by the dual-site Langmuir-Freundlich model due to surface heterogeneity in terms of energies and binding sites for metal-amine complex formation. Thus, cognitively designed AEMHs monoliths present the potential for ammonia storage in various applications by effectively overcoming structural challenges.

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独立的3d打印SrCl2单体，用于储存氨作为氢载体

碱土金属卤化物（AEMHs），如氯化锶（SrCl2），是很有前途的以氨形式储存氢的吸附剂。然而，由于在氨吸附过程中体积膨胀过大，这些吸附剂存在结构崩解问题。本研究报道了使用直接墨水书写技术制备膨润土支架的3d打印SrCl2单体。负载60% SrCl2的优化单体具有488 mg/g的氨存储容量，保持了显著的结构完整性，并在20个循环中有效地适应了吸附和解吸过程中的体积变化。动力学数据表明，氨吸附遵循伪二阶模型，晶间扩散是3d打印SrCl2结构的速率控制步骤。高压吸附等温线可以用二元Langmuir-Freundlich模型来解释，因为金属胺络合物形成的表面能量和结合位点不均匀。因此，认知设计的AEMHs单体通过有效克服结构挑战，在各种应用中呈现出氨储存的潜力。

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 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.