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Benchmark Investigation of SCC-DFTB Against Standard DFT to Model Phononic Properties in Two-Dimensional MOFs for Thermoelectric Applications
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2024-11-07 , DOI: 10.1021/acs.jctc.4c01229
Masoumeh Mahmoudi Gahrouei, Nikiphoros Vlastos, Oreoluwa Adesina, Laura de Sousa Oliveira

Despite the importance of modeling lattice thermal conductivity in predicting thermoelectric (TE) properties, computational data on heat transport, especially from first-principles, in 2D metal–organic frameworks (MOFs) remain limited due to the high computational cost. To address this, we provide a benchmark of the performance of semiempirical self-consistent-charge density functional tight-binding (SCC-DFTB) methods against density functional theory (DFT) for monolayer, serrated, AA-stacked and/or AB-stacked Zn3C6O6, Cd3C6O6, Zn-NH-MOF, and Ni3(HITP)2 MOFs. Harmonic lattice dynamics calculations, including partial atomic contributions to phonon dispersions, are evaluated with both SCC-DFTB and DFT, whereas anharmonic transport (i.e., thermal conductivity) is evaluated with SCC-DFTB only. Our findings further suggest that unlike the other stacking geometries modeled, serrated Zn3C6O6, serrated Zn-NH-MOF, and wavy serrated Ni3(HITP)2 represent stable geometries. While Zn3C6O6 and Zn-NH-MOF exhibit a higher power factor than Ni3(HITP)2 (as found in our previous work), Zn-NH-MOF shows lower thermal conductivity, resulting in the highest thermoelectric figure of merit (ZT) among the studied MOFs.

中文翻译:


SCC-DFTB 与标准 DFT 的基准研究,以模拟热电应用中二维 MOF 中的声子特性



尽管模拟晶格热导率在预测热电 (TE) 特性方面很重要,但由于计算成本高,二维金属有机框架 (MOF) 中关于热传递的计算数据,尤其是来自第一性原理的计算数据仍然有限。为了解决这个问题,我们提供了一个半经验自洽电荷密度泛函紧密结合 (SCC-DFTB) 方法与密度泛函理论 (DFT) 对单层、锯齿、AA 堆叠和/或 AB 堆叠 Zn3C6O6、Cd3C6O6、Zn-NH-MOF 和 Ni3 (HITP) 的性能基准2MOF 的。谐波晶格动力学计算,包括对声子分散的部分原子贡献,用 SCC-DFTB 和 DFT 评估,而非谐波传输(即热导率)只用 SCC-DFTB 评估。我们的研究结果进一步表明,与其他建模的堆叠几何形状不同,锯齿状 Zn3C6O6、锯齿状 Zn-NH-MOF 和波浪状锯齿状 Ni3 (HITP)2 代表稳定的几何形状。虽然 Zn3C6O6 和 Zn-NH-MOF 表现出比 Ni3(HITP)2 更高的功率因数(正如我们之前的工作中发现的那样),但 Zn-NH-MOF 显示出较低的热导率,导致在研究的 MOF 中具有最高的热电品质因数 (ZT)。
更新日期:2024-11-07
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