Excitability in the H{sub 2}+O{sub 2} reaction on a Rh(110) surface induced by high coverages of coadsorbed potassium

Journal Article · Sun Dec 07 00:00:00 EST 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4903187· OSTI ID:22413280

Rafti, Matías ^[1]; Imbihl, Ronald ^[2]

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1. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA-CONICET), Fac. Cs. Exactas, Universidad Nacional de La Plata, 64 y Diag. 113 (1900) La Plata (Argentina)
2. Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3-3a, D-30167 Hannover (Germany)

By means of photoemission electron microscopy as spatially resolving method, the effect of high coverages of coadsorbed potassium (0.16 ≤ θ{sub K} ≤ 0.21) on the dynamical behavior of the H{sub 2} + O{sub 2} reaction over a Rh(110) surface was investigated. We observe that the originally bistable system is transformed into an excitable system as evidenced by the formation of target patterns and spiral waves. At K coverages close to saturation (θ{sub K} ≈ 0.21) mass transport of potassium with pulses is seen.

• OSTI ID: 22413280
• Journal Information: Journal of Chemical Physics, Vol. 141, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTRON MICROSCOPY
HYDROGEN
PHOTOEMISSION
POTASSIUM
PULSES
RHODIUM 110
SURFACES