Adsorption and reaction of H2S on Cu(110) studied using scanning tunneling microscopy

作者：Shiotari Akitoshi; Okuyama Hiroshi^*; Hatta Shinichiro; Aruga Tetsuya; Hamada Ikutaro

来源：Physical Chemistry Chemical Physics, 2016, 18(6): 4541-4546.

DOI：10.1039/c5cp07726e

Using low-temperature scanning tunneling microscopy (STM), the adsorption and reaction of hydrogen sulfide (H2S) and its fragments (SH and S) on Cu(110) are investigated at 5 K. H2S adsorbs molecularly on the surface on top of a Cu atom. With voltage pulses of STM, it is possible to induce sequential dehydrogenation of H2S to SH and S. We found two kinds of adsorption structures of SH. The short-bridge site is the most stable site for SH, while the long-bridge site is the second. Density functional theory calculations show that the S-H axis is inclined from the surface normal for both species. The reaction of H2S with OH and O was directly observed to yield SH and S, respectively, providing a molecular-level insight into catalyst poisoning.

• 出版日期2016-2-14