Multi-Binding Sites United in Covalent-Organic Frameworks (MSUCOF) for H2 Storage and Delivery at Room Temperature

氢气储存 重量分析 金属有机骨架 结合能 共价键 过渡金属 纳米技术 化学 材料科学 化学工程 物理化学 有机化学 物理 催化作用 工程类 吸附 核物理学
作者
Marcus Djokic,José L. Mendoza-Cortés
出处
期刊:Energy & Fuels [American Chemical Society]
卷期号:38 (5): 4711-4720
标识
DOI:10.1021/acs.energyfuels.3c04075
摘要

The storage of hydrogen gas (H2) has presented a significant challenge that has hindered its use as a fuel source for transportation. To meet the Department of Energy's ambitious goals of achieving 50 g L–1 volumetric and 6.5 wt % gravimetric uptake targets, material-based approaches are essential. Designing materials that can efficiently store hydrogen gas requires careful tuning of the interactions between gaseous H2 and the surface of the material. Metal–organic frameworks (MOFs) and covalent-organic frameworks (COFs) have emerged as promising materials due to their exceptionally high-surface areas and tuneable structures that can improve gas-framework interactions. However, weak binding enthalpies have limited the success of many current candidates, which fail to achieve even 10 g L–1 volumetric uptake at ambient temperatures. To overcome this challenge, we utilized quantum mechanical (QM)-based force fields (FFs) to investigate the uptake and binding enthalpies of three linkers chelated with seven different transition metals (TMs), including both precious metals (Pd and Pt) and first row TM (Co, Cu, Fe, Ni, and Mn), to design 24 different COFs in silico. By applying QM-based FF with grand canonical Monte Carlo from 0 to 700 bar and 298 K, we demonstrated that Co-, Ni-, Mn-, Fe-, Pd-, and Pt-based MSUCOFs can already achieve the Department of Energy's hydrogen storage targets for 2025. Surprisingly, the COFs that incorporated the more affordable and abundant first-row TM often outperformed the precious metals. This promising development brings us one step closer to realizing a hydrogen-based energy economy.
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