迈向具有孔道限域电子的金属有机框架
Towards a Metal-Organic Framework with Pore-Confined Electrons
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中文总结 AI 辅助
本研究通过从头计算和密度泛函理论，提出在金属有机框架中稳定孔道限域电子的设计规则，并证明其可降低H2解离能垒，开启孔道空间催化的新范式。
中文摘要 AI 辅助
电子化物是一类非常规材料，其中电子定域在晶体学空隙中，而非仅围绕原子核，从而产生低功函数、强给电子特性甚至超导性等吸引人的性质。在此，我们使用从头计算方法研究金属有机框架（MOF）电子化物，这是一类将电子化物的间隙电子与MOF的永久孔隙率和化学可调性相结合的新型材料。这些材料容纳孔道限域电子：占据的电子态定域在孔道空间中，其能带略低于费米能级或穿过费米能级。利用密度泛函理论计算，我们通过阴离子-电子交换过程建立了在MOF中稳定孔道限域电子的若干设计规则，并识别出候选的MOF电子化物。作为概念验证，我们还证明孔道限域电子可以直接促进化学反应，显著降低H2解离的活化能垒，而无需在表面位点吸附。我们设想，纳米多孔材料中的孔道限域电子可能实现一种根本新型的催化，其中化学反应在孔道空间中发生，由电子中心活性位点驱动。
英文摘要
Electrides are an unconventional class of materials in which electrons are localized in crystallographic void spaces rather than solely around atomic nuclei, giving rise to appealing properties such as low work functions, strong electron-donating character, and even superconductivity. Here, we use ab initio methods to investigate metal-organic framework (MOF) electrides, a new class of materials that combines the interstitial electrons of electrides with the permanent porosity and chemical tunability of MOFs. These materials host pore-confined electrons: occupied electronic states localized in the pore space and with bands slightly below or crossing through the Fermi level. Using density functional theory calculations, we establish several design rules for stabilizing pore-confined electrons in MOFs via an anion-electron exchange process and identify candidate MOF electrides. As a proof-of-concept, we also demonstrate that the pore-confined electrons can directly facilitate chemical reactions, substantially lowering the activation barrier for H2 dissociation without requiring adsorption at a surface site. We envision that pore-confined electrons in nanoporous materials may enable a fundamentally new type of catalysis in which chemical reactions take place in the pore space, driven by electron-centered active sites.
发表机构
- Princeton University（普林斯顿大学）
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