BH4 dissociation on various metal (111) surfaces: A DFT study
Yükleniyor...
Dosyalar
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevıer Scıence Bv
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, the catalytic effect of various metal surfaces on the sequential decomposition of BH4 molecule has been studied by Density Functional Theory (DFT) for the first time. For this purpose, the sequential dissociation of BHx (x = 0 -> 4) molecules on Au, Cu, Al and Ag (1 1 1) surfaces were systematically investigated. At first, ground state structures of BHx (x = 0 -> 4) molecules and their decomposed versions such as BHx + yH (x + y = 4) were obtained. Then, transition state search calculations were performed to find activation barriers related to every BHx + yH (x + y = 4) decomposition step until x = 0 has been reached. An additional hydrogen atom(s) remaining from a previous step accepted as if they(it) are(is) at infinite distances from the central unit cell of the surface because it is prerequisite to form energy diagram which keeps the number of the atom(s) constant. Our calculations were supported with the lateral interaction energies and the various bond distances to clarify catalytic abilities of the surfaces. It is concluded that Au(1 1 1) surface is the most active surface among the others however the activity of the Cu(1 1 1) surface can compete with it. Al(1 1 1) and Ag(1 1 1) surfaces are the least active surfaces. This knowledge can be used to develop strategies to design Cu-based cheap and active catalyst for hydrogen generation from borohydride dissociation.
Açıklama
Anahtar Kelimeler
Borohydride Decomposition, Au(111) Surface, Al(111) Surface, Ag(111) Surface, Cu(111) Surface, DFT Calculations
Kaynak
Applıed Surface Scıence
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
473
