混合金属Cu-BTC金属-有机骨架作为低温下分子氢的强力吸附剂,ACS Omega

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混合金属Cu-BTC金属-有机骨架作为低温下分子氢的强力吸附剂
ACS Omega ( IF 3.7 ) Pub Date : 2020-10-26 , DOI: 10.1021/acsomega.0c02810
Abdul Malik P. Peedikakkal ₁ , Isam H. Aljundi ₂

Affiliation

氢和燃料电池技术的进步取决于储氢方法的发展。金属有机框架（MOF）是最有利于储氢的材料之一。在这项研究中，我们合成了一系列的1,3,5-苯三羧酸盐（BTC），M-Cu-BTC的同构混合金属金属有机骨架（MM-MOF），其中M = Zn 2 ⁺，Ni ²⁺，Co ²⁺和Fe ²⁺对金属离子使用合成后交换（PSE）方法。MM-MOFs的粉末X射线衍射图谱与单金属Cu-BTC相似。扫描电子显微镜表明不存在非晶相。MM-MOF的电感耦合等离子体质谱表明，使用PSE方法成功进行了金属交换。N ₂吸附测量证实了多孔MM-MOF的成功合成。研究了金属交换材料Ni-Cu-BTC，Zn-Cu-BTC，Fe-Cu-BTC和Co-Cu-BTC的储氢性能，其重量吸收率分别为1.6、1.63、1.63和1.12 wt％。分别。相对于母体MOF（Cu-BTC），三种金属交换材料的氢吸附容量增加了约60％。M-Cu-BTC（其中M = Ni 2 ⁺，Zn ²⁺和Fe ²⁺）重量吸收的改善可能是由于H ₂与不饱和金属位点交换后H ₂与不饱和金属位点的结合焓增加。铜²⁺其他金属离子。金属离子的较高电荷密度会强烈极化氢，并在Cu-BTC的孔内提供主要的结合位点，从而提高重量法吸收氢的能力。

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Mixed-Metal Cu-BTC Metal–Organic Frameworks as a Strong Adsorbent for Molecular Hydrogen at Low Temperatures

The advancement of hydrogen and fuel cell technologies hinges on the development of hydrogen storage methods. Metal–organic frameworks (MOFs) are one of the most favorable materials for hydrogen storage. In this study, we synthesized a series of isostructural mixed-metal metal–organic frameworks (MM-MOFs) of 1,3,5-benzenetricarboxylate (BTC), M-Cu-BTC, where M = Zn²⁺, Ni²⁺, Co²⁺, and Fe²⁺ using the post-synthetic exchange (PSE) method with metal ions. The powder X-ray diffraction patterns of MM-MOFs were similar with those of single-metal Cu-BTC. Scanning electron microscopy indicates the absence of amorphous phases. Inductively coupled plasma mass spectroscopy of the MM-MOFs shows successful metal exchanges using the PSE method. The N₂ adsorption measurements confirmed the successful synthesis of porous MM-MOFs. The metal exchanged materials Ni-Cu-BTC, Zn-Cu-BTC, Fe-Cu-BTC, and Co-Cu-BTC were studied for hydrogen storage and showed a gravimetric uptake of 1.6, 1.63, 1.63, and 1.12 wt %; respectively. The increase in hydrogen adsorption capacity for the three metal exchanged materials is about 60% relative to that of the parent MOF (Cu-BTC). The improvement of gravimetric uptake in M-Cu-BTC (where M = Ni²⁺, Zn²⁺, and Fe²⁺) is probably due to the increase in binding enthalpy of H₂ with the unsaturated metal sites after the partial exchange from Cu²⁺ to other metal ions. The higher charge density of metal ions strongly polarizes hydrogen and provides the primary binding sites inside the pores of Cu-BTC and subsequently enhances the gravimetric uptake of hydrogen.

更新日期：2020-11-12

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