Details
| Original language | English |
|---|---|
| Pages (from-to) | 4174-4183 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry C |
| Volume | 113 |
| Issue number | 10 |
| Early online date | 18 Feb 2009 |
| Publication status | Published - 12 Mar 2009 |
Abstract
Adding potassium as coadsorbate to the pattern forming system Rh(110)/NO + H2 generates new types of chemical wave patterns that have been investigated in the 10-6 and 10-5 mbar range using photoelectron emission microscopy as spatially resolving method. The modified patterns were studied for varying K coverages with θK 0.03, 0.05, 0.07, and 0.12. As in the unpromoted system, one finds elliptically and rectangular shaped target patterns, but in addition one observes stationary Turing-like concentration patterns, fingering instabilities, and the mass transport of potassium by propagating pulses. Large scale (a few tenths of a millimeter) redistribution of potassium by the chemical waves is seen. The propagation direction of traveling wave fragments is rotated by 90° in the presence of coadsorbed potassium. At high K, coverages the existence range for patterns is shifted drastically toward higher pH2.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 113, No. 10, 12.03.2009, p. 4174-4183.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Patterns in the NO + H2 Reaction on Rh(110) modified by coadsorbed potassium
AU - Hong, Liu
AU - Hesse, Martin
AU - Imbihl, R.
PY - 2009/3/12
Y1 - 2009/3/12
N2 - Adding potassium as coadsorbate to the pattern forming system Rh(110)/NO + H2 generates new types of chemical wave patterns that have been investigated in the 10-6 and 10-5 mbar range using photoelectron emission microscopy as spatially resolving method. The modified patterns were studied for varying K coverages with θK 0.03, 0.05, 0.07, and 0.12. As in the unpromoted system, one finds elliptically and rectangular shaped target patterns, but in addition one observes stationary Turing-like concentration patterns, fingering instabilities, and the mass transport of potassium by propagating pulses. Large scale (a few tenths of a millimeter) redistribution of potassium by the chemical waves is seen. The propagation direction of traveling wave fragments is rotated by 90° in the presence of coadsorbed potassium. At high K, coverages the existence range for patterns is shifted drastically toward higher pH2.
AB - Adding potassium as coadsorbate to the pattern forming system Rh(110)/NO + H2 generates new types of chemical wave patterns that have been investigated in the 10-6 and 10-5 mbar range using photoelectron emission microscopy as spatially resolving method. The modified patterns were studied for varying K coverages with θK 0.03, 0.05, 0.07, and 0.12. As in the unpromoted system, one finds elliptically and rectangular shaped target patterns, but in addition one observes stationary Turing-like concentration patterns, fingering instabilities, and the mass transport of potassium by propagating pulses. Large scale (a few tenths of a millimeter) redistribution of potassium by the chemical waves is seen. The propagation direction of traveling wave fragments is rotated by 90° in the presence of coadsorbed potassium. At high K, coverages the existence range for patterns is shifted drastically toward higher pH2.
UR - http://www.scopus.com/inward/record.url?scp=65249117469&partnerID=8YFLogxK
U2 - 10.1021/jp810540g
DO - 10.1021/jp810540g
M3 - Article
AN - SCOPUS:65249117469
VL - 113
SP - 4174
EP - 4183
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 10
ER -