The infrared spectrum of hydrogen chemisorbed on zinc oxide

Hydrogen Loading of Oxide Powder Particles: A Transmission IR Study for the Case of Zinc Oxide

“…They originate from the reversible dissociative adsorption of H 2 on both surface O and Zn sites and are assigned to OH and ZnH species, respectively. [28][29][30][31][32] Again, an increase of the IR background is observed, directly revealing that also in this case charge carriers are donated to the conduction band, thus providing strong evidence that H atoms diffuse into the bulk and occupy interstitial sites in a manner similar to that observed after exposure to atomic hydrogen. At a H 2 pressure of 10 mbar the bulk density of charge carriers amounts to 6 10 14 cm…”

Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism

“…3, it is likely that this alone cannot account for the very large modulation observed in the ZnO nanofibers. According to the literature survey [28][29][30], the adsorption of hydrogen species on the ZnO surface is quite complicated depending upon the experimental conditions. Usually, the heterolytic chemisorption of hydrogen occurs on both surfaces Zn and O sites of ZnO [28].…”

Characterization of hydrogen dissociation over aluminium-doped zinc oxide using an efficient massively parallel framework for QM/MM calculations

“…In particular, the potential sites for the physi-and chemisorption of hydrogen were considered on the catalytically important polar zinc (0001) and oxygen (0001) terminated surfaces of ZnO, while the nonpolar (1010) surface was used for comparison. The adsorption of hydrogen on the ZnO surface comprises two major modes (Eischens et al 1962;Dent & Kokes 1969;French et al 2003a): type I adsorption is the reversible dissociative adsorption of H 2 on Zn−O dimers (exposed at zinc oxide surfaces) that results in a pair of Zn−H and O−H species; type II is also dissociative adsorption of H 2 but is irreversible and yields bridging Zn−H−Zn and O−H. .…”