Fine-Tuning a Robust Metal–Organic Framework toward Enhanced Clean Energy Gas Storage

The development of adsorbents with molecular precision offers a promising strategy to enhance storage of hydrogen and methaneconsidered the fuel of the future and a transitional fuel, respectivelyand to realize a carbon-neutral energy cycle. Herein we employ a postsynthetic modification strategy on a robust metal–organic framework (MOF), MFU-4l, to boost its storage capacity toward these clean energy gases. MFU-4l-Li displays one of the best volumetric deliverable hydrogen capacities of 50.2 g L–1 under combined temperature and pressure swing conditions (77 K/100 bar → 160 K/5 bar) while maintaining a moderately high gravimetric capacity of 9.4 wt %. Moreover, MFU-4l-Li demonstrates impressive methane storage performance with a 5–100 bar usable capacity of 251 cm3 (STP) cm–3 (0.38 g g–1) and 220 cm3 (STP) cm–3 (0.30 g g–1) at 270 and 296 K, respectively. Notably, these hydrogen and methane storage capacities are significantly improved compared to those of its isoreticular analogue, MFU-4l, and place MFU-4l-Li among the best MOF-based materials for this application.具备分子级精准性的吸附剂开发，为提升氢气与甲烷的存储性能（二者分别被视为未来燃料与过渡性燃料）、实现碳中和能源循环提供了极具前景的策略。本文针对一款稳定的金属有机框架（metal–organic framework, MOF）MFU-4l，采用后合成修饰策略以提升其对这类清洁能源气体的存储容量。MFU-4l-Li在温压联合变工况（77 K/100 bar → 160 K/5 bar）下展现出最优的体积可释放储氢容量之一，达50.2 g·L⁻¹，同时保持了9.4 wt%的较高重量储氢容量。此外，MFU-4l-Li展现出优异的甲烷存储性能：在5–100 bar工况下，其可利用储甲烷容量在270 K和296 K时分别达251 cm³(STP)·cm⁻³（0.38 g·g⁻¹）与220 cm³(STP)·cm⁻³（0.30 g·g⁻¹）。值得注意的是，相较于其同网类似物MFU-4l，MFU-4l-Li的储氢与储甲烷性能均得到显著提升，使其跻身该应用领域中性能最优的MOF基材料之列。