Details
| Original language | English |
|---|---|
| Pages (from-to) | 9822-9829 |
| Number of pages | 8 |
| Journal | Journal of Chemical Physics |
| Volume | 113 |
| Issue number | 21 |
| Publication status | Published - 1 Dec 2000 |
Abstract
The catalytic O2+H2 reaction on Rh(111) has been investigated in the 10-6-10-5 mbar range using photoelectron emission microscopy (PEEM) as spatially resolving method. Depending on the pretreatment of the sample in which the sample was exposed to pO2=2×10-4 mbar at T =770 K for varying times (tOX) different dynamic behavior was found. For tOX=12 h we found simple bistable behavior with reaction fronts initiating transitions between an unreactive high oxygen coverage state and a reactive almost bare surface. For tOX=36h low work function (WF) areas developed in the area where two reaction fronts collided. For very long oxygen pretreatments with tOX=48 h the formation of secondary fronts traveling backwards from the area where two primary fronts collided were seen. The properties of the low WF areas which have been tentatively assigned to subsurface oxygen were studied in adsorption and titration experiments.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Chemical Physics, Vol. 113, No. 21, 01.12.2000, p. 9822-9829.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Bistability and formation of low work function areas in the O2+H2 reaction on a Rh(111) surface
AU - Schaak, A.
AU - Imbihl, R.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - The catalytic O2+H2 reaction on Rh(111) has been investigated in the 10-6-10-5 mbar range using photoelectron emission microscopy (PEEM) as spatially resolving method. Depending on the pretreatment of the sample in which the sample was exposed to pO2=2×10-4 mbar at T =770 K for varying times (tOX) different dynamic behavior was found. For tOX=12 h we found simple bistable behavior with reaction fronts initiating transitions between an unreactive high oxygen coverage state and a reactive almost bare surface. For tOX=36h low work function (WF) areas developed in the area where two reaction fronts collided. For very long oxygen pretreatments with tOX=48 h the formation of secondary fronts traveling backwards from the area where two primary fronts collided were seen. The properties of the low WF areas which have been tentatively assigned to subsurface oxygen were studied in adsorption and titration experiments.
AB - The catalytic O2+H2 reaction on Rh(111) has been investigated in the 10-6-10-5 mbar range using photoelectron emission microscopy (PEEM) as spatially resolving method. Depending on the pretreatment of the sample in which the sample was exposed to pO2=2×10-4 mbar at T =770 K for varying times (tOX) different dynamic behavior was found. For tOX=12 h we found simple bistable behavior with reaction fronts initiating transitions between an unreactive high oxygen coverage state and a reactive almost bare surface. For tOX=36h low work function (WF) areas developed in the area where two reaction fronts collided. For very long oxygen pretreatments with tOX=48 h the formation of secondary fronts traveling backwards from the area where two primary fronts collided were seen. The properties of the low WF areas which have been tentatively assigned to subsurface oxygen were studied in adsorption and titration experiments.
UR - http://www.scopus.com/inward/record.url?scp=0034500157&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034500157
VL - 113
SP - 9822
EP - 9829
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 21
ER -