Adsorption and reaction of water, oxygen, and hydrogen on Pd(100): Identification of adsorbed hydroxyl and implications for the catalytic H2–O2 reaction

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Abstract
Water adsorption on clean and oxygen covered Pd(100) has been studied by electron energy loss spectroscopy and low energy electron diffraction. On the clean surface water is associatively adsorbed and reveals hydrogen bonding. Hydroxyl is produced upon water adsorption on oxygen precovered Pd(100). The hydroxyl molecule is adsorbed with its molecular axis significantly tilted away from the surface normal. A study of the reactivity of coadsorbed hydrogen and hydroxyl yields new information on the catalytic oxidation of hydrogen on Pd(100). The following reaction path could be inferred: Oad+Had→OHad, 2OHad→Oad+H2Oad→Oad+H2Og.