Kinetic Rates and Linear Free Energy Relationships for Water Dissociation on Transition and Noble Metal Dimers

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• 作者：Constantinos D. Zeinalipour-Yazdi ; Rutger A. van Santen
• 刊名：Journal of Physical Chemistry A
• 出版年：2009
• 出版时间：June 25, 2009
• 年：2009
• 卷：113
• 期：25
• 页码：6971-6978
• 全文大小：261K
• 年卷期：v.113,no.25(June 25, 2009)
• ISSN：1520-5215

文摘

A systematic study of the adsorption and dissociation of water on transition and noble metal dimers (Fe₂, Ru₂, Os₂, Co₂, Rh₂, Ir₂, Ni₂, Pd₂, Pt₂, Cu₂, Ag₂, Au₂) is presented. Spin-unrestricted density functional theory simulations indicate that the dissociation (lysis) of water on these clusters may be thermally driven even in the absence of other electrocatalytically and photocatalytically driven processes. Two reaction pathways are found with turnover frequencies for water dissociation given by the following series: Co₂ > Ir₂ > Fe₂ > Rh₂ > Ni₂ > Pt₂ > Ru₂ > Os₂ > Cu₂ > Au₂ > Pd₂ > Ag₂ at standard ambient temperature and pressure. Linear free energy relationships are presented that can predict the dissociation barrier of water on transition and noble metals as a function of free energy change for dissociation.