在硬币金属表面上脱和脱反应的密度功能基准
Lin Chen1, Johanna Rosen1, Jonas Björk1
1Materials Design Division, Department of Physics, Chemistry and Biology, IFM, Linköping University, 58183, Linköping, Sweden.
本研究评估了五种密度函数理论 (DFT) 方法,用于模拟表面反应. rev-vdW-DF2和BEEF-vdW表现出不同的性能,影响有机纳米结构合成计算激活能量的准确性.
科学领域:
- 计算化学是一种计算化学.
- 表面科学是一门科学.
- 材料科学是一种材料科学.
背景情况:
- 有机纳米结构的表面合成对于先进材料至关重要.
- 密度函数理论 (DFT) 被广泛使用,但面临着复杂的表面相互作用的挑战.
- 关于不同DFT方法对计算反应结果的影响存在一个知识差距.
研究的目的:
- 评估包含范德瓦尔斯 (vdW) 相互作用的五种不同的DFT方法.
- 评估它们在描述原型表面反应方面的准确性.
- 为表面化学选择适当的DFT函数提供指导.
主要方法:
- 使用了五种DFT方法:PBE+D3,PBE+vdWsurf,rev-vdWDF2,r2SCAN+rVV10和BEEF-vdW. 这五种方法都在使用中.
- 研究了三种反应:脱,脱和脱.
- 专注于硬币金属 (Cu,Ag,Au) 的111个方面.
主要成果:
- rev-vdW-DF2在吸附方面表现出色;BEEF-vdW表现不佳.
- 大多数函数准确地预测了Cu,Ag和Au的脱/除激活能,除了BEEF-vdW.
- 所有vdW方法都正确地确定了脱的反应性趋势Cu>Ag>Au,而BEEF-vdW在脱动力学方面失败了.
结论:
- 选择DFT函数显著影响在表面反应建模的准确性.
- rev-vdW-DF2和BEEF-vdW在吸附和反应能量方面具有不同的性能特征.
- 这项工作为在表面化学研究中选择DFT方法奠定了基础.
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