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對于Pt單晶而言,不同晶面其最穩(wěn)定的吸附位置也不同。例如,Pt(111)表面不同吸附位的結合能相近(約為0.40~0.5ev)。而Pt(100)晶面為C4、局部點群對稱性,由于存在三類不等價勢能面,分別與表面三類不等價吸附位頂位(T),橋位(B)和空洞(H)位對應,勢必會造成不同吸附位的吸附能不同。Yao等采用密度泛函理論對吸附位頂位(T),橋位(B)和空洞(H)位進行計算,結果表明,H原子最容易在橋位吸附,吸附能最高為0.91ev,文獻xu33采用B3LYP簇模犁的計算結果也表明橋位吸附能量更大。Arvia proved that it was more favorable for H atoms to absorb into Pt surface at bridge sites by EHMO theoretical calculation.我們采用第一性原理進行了計算,也得出了同樣的結論,從而進一步證實了在橋位,更有利于發(fā)生反應。 As far as single-crystal Pt is concerned, the most stable adsorption position is related to the miller index of crystal planes. For example, for Pt(111), binding-energy which belongs to different adsorption is similar (about 0.40~0.50ev). Meanwhile, for Pt (100), it is belong to C4, local point group of symmetry. Because there are three kinds of non-equivalence potential surfaces, which are corresponding to three kinds of non-equivalence surface adsorption sites: atop site, bridge site, hollow site, respectively, it is an inevitable result that the adsorption energy of different adsorption sites is different. Yao calculated absorption situation at atop site, bridge site, hollow site, respectively by using density functional theory. It was indicated that H atom was most easily absorbed onto bridge site, with a maximum adsorption energy of 0.91ev. Xu proved that the adsorption energy was largest at bridge site using B3LYP cluster mould. Arvia proved that it was more favorable for H atoms to absorb onto Pt surface at bridge sites by EHMO theoretical calculation. We draw the same conclusion by first principle calculation, and it further proved it was favored for the reaction carrying on at bridge site. [ Last edited by zhangzhiweia on 2010-12-15 at 18:01 ] |
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