Adsorption of hydrogen on clean and modified magnesium films

被引:39
作者
Johansson, Martin
Ostenfeld, Christopher W.
Chorkendorff, Ib [1 ]
机构
[1] Tech Univ Denmark, Danish Natl Res Fdn, CINF, DK-2800 Lyngby KGS, Denmark
[2] Tech Univ Denmark, Dept Phys, Nano DTU, DK-2800 Lyngby KGS, Denmark
关键词
D O I
10.1103/PhysRevB.74.193408
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The sticking of hydrogen on 400 A thick magnesium films, grown under ultrahigh vacuum conditions, have been measured under conditions relevant for hydrogen storage, i.e., elevated temperatures and pressures. A model which describes the hydrogenation and desorption kinetics of the pure magnesium films at H/Mg ratios less than 2% is developed. The activation barrier for hydrogen dissociation is 72 +/- 15 kJ/mole H-2, and a stagnant hydrogen uptake is observed. For platinum-catalyzed films, the barrier is significantly reduced, and there is no stagnation in the uptake rate.
引用
收藏
页数:4
相关论文
共 23 条
[1]   INTERACTION OF HYDROGEN WITH SOLID-SURFACES [J].
CHRISTMANN, K .
SURFACE SCIENCE REPORTS, 1988, 9 (1-3) :1-163
[2]  
*CRC, 2003, CRC HDB CHEM PHYS CD
[3]   Role of steps in N2 activation on Ru(0001) [J].
Dahl, S ;
Logadottir, A ;
Egeberg, RC ;
Larsen, JH ;
Chorkendorff, I ;
Törnqvist, E ;
Norskov, JK .
PHYSICAL REVIEW LETTERS, 1999, 83 (09) :1814-1817
[4]   Tailoring hydrogen storage materials towards application [J].
Dornheim, M. ;
Eigen, N. ;
Barkhordarian, G. ;
Klassen, T. ;
Bormann, R. .
ADVANCED ENGINEERING MATERIALS, 2006, 8 (05) :377-385
[5]   The role of Ti as a catalyst for the dissociation of hydrogen on a Mg(0001) surface [J].
Du, AJ ;
Smith, SC ;
Yao, XD ;
Lu, GQ .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (38) :18037-18041
[6]   Alloy catalysts designed from first principles [J].
Greeley, J ;
Mavrikakis, M .
NATURE MATERIALS, 2004, 3 (11) :810-815
[7]   Electronic factors determining the reactivity of metal surfaces [J].
Hammer, B ;
Norskov, JK .
SURFACE SCIENCE, 1995, 343 (03) :211-220
[8]   WHY GOLD IS THE NOBLEST OF ALL THE METALS [J].
HAMMER, B ;
NORSKOV, JK .
NATURE, 1995, 376 (6537) :238-240
[9]  
Hammer B, 2000, ADV CATAL, V45, P71
[10]   COUPLED TRANSLATIONAL-VIBRATIONAL ACTIVATION IN DISSOCIATIVE HYDROGEN ADSORPTION ON CU(110) [J].
HAYDEN, BE ;
LAMONT, CLA .
PHYSICAL REVIEW LETTERS, 1989, 63 (17) :1823-1825