1996
DOI: 10.1016/0039-6028(96)00793-5
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Unusual behaviour of chemical waves in the NO + H2 reaction on Rh(111): long-range diffusion and formation of patches with reduced work function

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Cited by 42 publications
(26 citation statements)
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“…Elliptically and rectangularly shaped chemical waves were found with PEEM on Rh͑110͒ and these shapes could be controlled by changing the experimental conditions. 12 The PEEM results reported for Rh͑111͒ 13 are rather similar to those for Rh͑110͒, except that no square waves were observed. A new species was observed, which was characterized by a work function drop below that of the clear surface when two or more reaction fronts collided.…”
Section: Modeled the Oscillations Reported Forsupporting
confidence: 76%
See 1 more Smart Citation
“…Elliptically and rectangularly shaped chemical waves were found with PEEM on Rh͑110͒ and these shapes could be controlled by changing the experimental conditions. 12 The PEEM results reported for Rh͑111͒ 13 are rather similar to those for Rh͑110͒, except that no square waves were observed. A new species was observed, which was characterized by a work function drop below that of the clear surface when two or more reaction fronts collided.…”
Section: Modeled the Oscillations Reported Forsupporting
confidence: 76%
“…This species can be attributed to either subsurface oxygen or NH x . 13 The first observations of rate oscillations and hysteresis phenomena in the NOϩH 2 reaction over macroscopic Rh single crystal surfaces were reported by Janssen et al 14,15 for Rh͑533͒ and recently by Cobden et al 16 for Rh͑111͒. An interesting feature of the oscillatory kinetics in the NOϩH 2 reaction is that, for Pt͑100͒, N 2 and NH 3 signals oscillate in phase, whereas for Rh͑533͒ and Rh͑111͒, the rate of N 2 formation oscillates out of phase with the rate of NH 3 formation.…”
Section: Modeled the Oscillations Reported Formentioning
confidence: 97%
“…The first of these steps, i.e. the chemisorption of oxygen on Rh single crystal surfaces, has been the subject of intensive experimental and theoretical research, [7][8][9][10] but only few experimental studies have addressed the ensuing formation of sub-surface oxygen, [11][12][13][14][15][16][17] . In one of these studies it could recently be shown 16 that exposure of the Rh(111) surface to O 2 at moderatly elevated temperatures (∼ 470 K) leads to the formation of sub-surface oxygen species, and there is evidence that at least ∼ 0.9 monolayer (ML) of O is adsorbed on the surface before sub-surface sites are occupied.…”
Section: Introductionmentioning
confidence: 99%
“…setting up the PEEM system by Prof. Schlö gl in Compared with previous results [1][2][3][4][5][6], the formaFritz -Haber-Institut der MPG (Berlin). This tion of subsurface oxygen occurred on the defect work was financially supported by the National surface under a rather low pressure.…”
mentioning
confidence: 83%
“…Pt, Pd, Rh) has been extensively studied. Under Photoemission electron microscopy (PEEM ) is certain conditions, oxygen adsorbed on the surbased on the principle that the photoelectron yield faces can penetrate the topmost layer of the bulk depends sensitively on the local work function to form subsurface oxygen species, which may when the surface is illuminated by an ultraviolet alter the catalytic activities [1][2][3][4][5][6]. For example, light source whose energy is just above the threshsubsurface oxygen is believed to play an important hold of photoelectron exciting [8].…”
mentioning
confidence: 99%