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arXiv 2403.01730cond-mat.mtrl-sci
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二维π共轭金属-有机框架作为CO2还原反应电催化剂对高选择性产物的原子尺度效应

Atomic-scale effect of 2D π-conjugated metal-organic frameworks as electrocatalysts for CO2 reduction reaction towards highly selective products

Ran Wang, Chaozheng He, Weixing Chen, Qingquan Kong, Thomas Frauenheimac

AI总结:

本研究基于二维π共轭MOFs理论预测五种高选择性CO2RR电催化剂,并揭示金属-连接体协同、孔径、自旋磁矩及表面亲和性对反应路径和产物选择性的调控机制。

摘要:

电催化CO2还原技术是缓解温室气体排放和能源危机的关键。然而,在低过电位下控制CO2RR产物的选择性仍然是一项挑战。本文基于二维π共轭MOFs(金属-有机框架)在组成结构和孔径可调方面的优势,在理论层面预测了五种具有不同产物特异性选择性的高性能CO2RR电催化剂。此外,通过反应机理和电子结构分析,我们发现二维MOFs中金属原子与有机连接体之间的协同相互作用可以有效调控活性中心的电子结构。它们的孔径以及碳材料的多样性可以调节金属原子的自旋磁矩,从而影响其催化性能的提升。同时,催化剂表面对氧或碳的亲和性决定了关键中间体形成过程中的差异,这最终决定了反应路径和产物选择性。我们提出的这些见解将有助于高活性CO2RR电催化剂的开发与设计。

英文摘要:

Electrocatalytic CO2 reduction technology is key to mitigating greenhouse gas emissions and the energy crisis. However, controlling the selectivity of CO2RR products at low overpotential remains a challenge. In this paper, we predicted five high-performance CO2RR electrocatalysts with different product-specific selectivities at the theoretical level based on the advantages of the compositional structure and the tunable pore size of 2D π-conjugated MOFs. In addition, through the reaction mechanism and electronic structure analysis, we found that the synergistic interaction between metal atoms and organic linkers of 2D MOFs can effectively regulate the electronic structure of the active center. Their pore size as well as the diversity of carbon materials can regulate the spin magnetic moments of the metal atoms, thus affecting the improvement of their catalytic performance. Meanwhile, the oxygen or carbon affinity of the catalyst surface determines the differences in the formation of key intermediates, which ultimately determines the reaction path and product selectivity. These insights we present will be useful for the development and design of highly active CO2RR electrocatalysts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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