Structures of seven molybdenum surfaces and their coverage dependent hydrogen adsorption

Tao Wang, Xinxin Tian, Yong Yang, Yong Wang Li, Jianguo Wang, Matthias Beller, Haijun Jiao

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23 Scopus citations

Abstract

Systematic density functional theory calculations and ab initio atomistic thermodynamics were applied to investigate the stability of seven metallic Mo surfaces [(110), (211), (111), (321), (310), (210) (100)] and their coverage dependent hydrogen adsorption. Only dissociative hydrogen adsorption is favored on these surfaces up to more than one monolayer saturation coverage. The computed hydrogen desorption temperatures on Mo(100) at 500 K and on Mo(110) at 410 K are in agreement with the available temperature-programmed desorption results. Under the consideration of H2 as the reduction reagent in Mo catalyst preparation, the computed surface morphology of Mo single crystal shows only exposed (110), (211) and (100) at high temperature; and the estimated surface proportion order of (110) > (211) > (100) agrees very well with the X-ray diffraction detected intensity order of (110) > (211) > (100). Surface reconstruction upon hydrogen adsorption has also been discussed.

Original languageEnglish
Pages (from-to)6005-6012
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number8
DOIs
StatePublished - 2016
Externally publishedYes

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