美国西北大学J. Fraser Stoddart课题组在一项最新研究中，实现了平衡超分子晶体中氢的体积和重量容量。该项研究成果发表在2024年9月3日出版的《自然—化学》上。

据介绍，氢的储存是其应用的关键。开发具有高容量和高重量储存能力的吸附材料，是氢作为燃料的使用所必需的，这是具有挑战性的。

在这项研究中，课题组报告了氢键有机框架(RP-H100和RP-H101)中的可控链化策略，该策略依赖于多个氢键以点接触方式引导链化，从而获得高体积和重量表面积，稳定性和理想孔径(~1.2–1.9 nm)用于储氢。

这种方法包括将九个咪唑环化的三萜六酸，组装成一个含有三个开放通道的二级六边形上层结构，其中七个六边形通过这些通道相互渗透，形成一个七重链化的超结构。RP-H101在综合温度和压力变化(77 K/100 bar → 160 K/5 bar)下，具有高的可交付体积(537  g l⁻¹)和重量(9.3 wt%)容量。

这项工作阐明了超分子晶体作为有希望的储氢候选者的优点。

附：英文原文

Title: Balancing volumetric and gravimetric capacity for hydrogen in supramolecular crystals

Author: Zhang, Ruihua, Daglar, Hilal, Tang, Chun, Li, Penghao, Feng, Liang, Han, Han, Wu, Guangcheng, Limketkai, Benjie N., Wu, Yong, Yang, Shuliang, Chen, Aspen X.-Y., Stern, Charlotte L., Malliakas, Christos D., Snurr, Randall Q., Stoddart, J. Fraser

Issue&Volume: 2024-09-03

Abstract: The storage of hydrogen is key to its applications. Developing adsorbent materials with high volumetric and gravimetric storage capacities, both of which are essential for the efficient use of hydrogen as a fuel, is challenging. Here we report a controlled catenation strategy in hydrogen-bonded organic frameworks (RP-H100 and RP-H101) that depends on multiple hydrogen bonds to guide catenation in a point-contact manner, resulting in high volumetric and gravimetric surface areas, robustness and ideal pore diameters (~1.2–1.9 nm) for hydrogen storage. This approach involves assembling nine imidazole-annulated triptycene hexaacids into a secondary hexagonal superstructure containing three open channels through which seven of the hexagons interpenetrate to form a seven-fold catenated superstructure. RP-H101 exhibits high deliverable volumetric (53.7 g l−1) and gravimetric (9.3 wt%) capacities for hydrogen under a combined temperature and pressure swing (77 K/100 bar → 160 K/5 bar). This work illustrates the virtues of supramolecular crystals as promising candidates for hydrogen storage. 

DOI: 10.1038/s41557-024-01622-w

Source: https://www.nature.com/articles/s41557-024-01622-w