arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01647cond-mat.mtrl-sci
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理解机械应变对过渡金属催化活性的影响

Understanding the effect of mechanical strains on the catalytic activity of transition metals

Carmen Martínez-Alonso, José Manuel Guevara-Vela, Javier LLorca

摘要:

分析了弹性应变对13种后过渡金属(fcc金属Ni、Cu、Pd、Ag、Pt、Au、Rh、Ir的8个(111)面和hcp金属Co、Zn、Cd、Ru、Os的5个(0001)面)析氢反应(HER)和氧还原反应(ORR)催化活性的影响。先前通过密度泛函理论计算获得了不同中间反应的相应吸附能,直至由机械稳定性极限决定的应变。结果发现,弹性应变可以用来调整不同的金属的催化活性,通过降低的速度限制步骤的能量障碍,甚至达到火山图的尖点。最大的变化,在催化活性与应变的HER被发现在Pt,Au,和Ir,而Co和Ni是非常不敏感的这种策略。在ORR的情况下,Au的催化活性可以通过施加拉伸应变来增强,而Cu、Ni、Pt、Pd、Rh、Co、Ru和Os的催化活性通过施加压缩应变来提高。然而,Ir的催化活性对机械变形相当不敏感。弹性应变能够修改在金,铂,银,和Os的速率限制反应,并有可能实现这些金属的火山图的尖点。最后,机械不稳定性达到在小应变Zn和Cd,这并没有导致显着的变化,HER和ORR的催化活性。这些结果提供了一个框架,系统地研究弹性应变在新催化剂设计中的应用。

英文摘要:

The effect of elastic strains on the catalytic activity for the hydrogen evolution reaction (HER) and the oxygen reduction reaction (ORR) was analyzed on thirteen late transition metals: eight (111) surfaces of fcc metals (Ni, Cu, Pd, Ag, Pt, Au, Rh, Ir) and five (0001) surfaces of hcp metals (Co, Zn, Cd, Ru, and Os). The corresponding adsorption energies for the different intermediate reactions up to strains dictated by the mechanical stability limits were previously obtained by means of density functional theory calculations. It was found that the elastic strains can be used to tune the catalytic activity of different metals by reducing the energy barrier of the rate limiting step and even to reach the cusp of the volcano plot. The largest changes in catalytic activity with strain for the HER were found in Pt, Au, and Ir while Co and Ni were very insensitive to this strategy. In the case of the ORR, the catalytic activity of Au could be enhanced by the application of tensile strains while that of Cu, Ni, Pt, Pd, Rh, Co, Ru, and Os was improved by the application of compressive strains. However, the catalytic activity of Ir was rather insensitive to mechanical deformations. Elastic strains were able to modify the rate limiting reaction in Au, Pt, Ag, and Os and it was possible to achieve the cusp of the volcano plot in these metals. Final, mechanical instabilities were attained at small strains in Zn and Cd, which did not lead to significant changes in the catalytic activity for HER and ORR. These results provide a framework to systematically investigate the application of elastic strains in the design of new catalysts.

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