DFT Study of Hydrogen Adsorption on Palladium Decorated Graphene

被引:125
作者
Lopez-Corral, Ignacio [1 ]
German, Estefania [1 ]
Juan, Alfredo [1 ]
Volpe, Maria A.
Brizuela, Graciela P. [1 ]
机构
[1] Univ Nacl Sur, CONICET, Inst Fis Sur, RA-8000 Bahia Blanca, Buenos Aires, Argentina
关键词
WALLED CARBON NANOTUBES; AB-INITIO; ELECTRONIC-STRUCTURE; ATOMIC-HYDROGEN; STORAGE; SPILLOVER; GRAPHITE; ENERGIES; MODEL; DISSOCIATION;
D O I
10.1021/jp110067w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The adsorption of several molecular and dissociative dihydrogen systems on a Pd-decorated graphene monolayer was studied using the density-functional theory. Our calculations show that the most favorable graphene-supported coordination structure is similar to the PdH2 complex in vacuum, where the H-H bond is relaxed but not dissociated. We so computed overlap populations corresponding to bonds and atomic orbital interactions in order to study the evolution of the chemical bonding. During the decoration process with Pd, we detected a weakening of C-C bonds close to the adsorption site and the formation of strong C-Pd bonds coming from interaction between C2p(z) and Pd 5S, Sp(z), and 4d(z)(2) orbitals. After H-2 molecule adsorption, the H-Pd bond is formed by the H is orbital overlap with the Pd 5s orbital, but this interaction became stronger during the atomic hydrogen adsorption. The objective of this work is to contribute to the understanding of the hydrogen uptake of Pd-doped graphene surfaces.
引用
收藏
页码:4315 / 4323
页数:9
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