SPECTROSCOPIC CHARACTERIZATION OF SURFACE FORMATES PRODUCED VIA REACTION OF HCOOH AND HCOOCH3 ON THE (0001) SURFACE OF ZINC-OXIDE
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The formation and decomposition of surface formate species formed via reactions of HCOOH and HCOOCH3 on the (0001)-Zn polar surface of ZnO were studied using temperature programmed desorption and X-ray and ultraviolet photoelectron spectroscopies. Methyl formate underwent nucleophilic attack by lattice oxygen on the (0001)-Zn polar surface which resulted in the formation of surface formate and methoxy species. The surface methoxy species were subsequently oxidized to surface formate. Adsorbed formate species decomposed during TPD experiments at 575 K producing CO, CO2, and H2. Ultraviolet photoelectron spectra of adsorbed formate species on the (0001)-Zn surface showed greater perturbation of the low-lying valence energy levels than formates adsorbed on noble metal surfaces. This result is consistent with previous studies of the electronic structure of adsorbed species on ZnO surfaces. 1988.