Chemisorption of hydrogen on ultrathin Pd films on Mo (100)

✍ Scribed by John M. Heitzinger; Steven C. Gebhard; Bruce E. Koel

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 532 KB
• Volume: 200
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)87046-r

✦ Synopsis

The Hz adsorption properties of ultrathin Pd films deposited on Mo( 100) have been studied with Auger electron spectroscopy (AES) and temperature-programmed desorption (TPD). The pseudomorphic monolayer of Pd on Mo( 100) has a greatly rcduccd H2 uptake capacity at 150 K compared to bulk Pd. Desorption from the Pd monolayer occurs from a chemisorption state with a desorption temperature of about 290 K. Thicker Pd fiis also have a reduced Hz uptake, until I?& 5.5. H, desorption from the low-temperature hydride state that is characteristic of bulk Pd only occurs for Pd films with &.& 5.5.