Tuning excitability by alloying: the Rh(111)/Ni/H2 + O2 system.
Tuning excitability by alloying: the Rh(111)/Ni/H2 + O2 system.
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通过合金化调节兴奋性:Rh(111)/Ni/H2 O2 系统
DOI:
10.1039/c5cp06792h
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Ronald Imbihl
中科院分区:
文献类型:
--
作者:
Tim Smolinsky;Mathias Homann;Ronald Imbihl
The dynamic behavior of the O2 + H2 reaction on a Rh(111) surface alloyed with Ni has been studied in the 10−5 mbar range using photoemission electron microscopy (PEEM) as a spatial resolving method. For T = 773 K and p(O2) = 5 × 10−5 mbar the bifurcation diagram has been mapped out as a function of the Ni coverage in a range of 0 ML ≤ ΘNi ≥ 1.3 ML. A critical Ni coverage of ΘNi,crit = 0.13 monolayers (ML) is required for excitability. In the excitable parameter range pulse trains and irregular chemical wave patterns are found. Whereas the propagation speed of the pulses exhibits no clear-cut dependence on the Ni coverage, the frequency of the local PEEM intensity oscillations increases linearly with Ni coverage in the range from ΘNi = 0.13 ML to ΘNi = 1.3 ML.
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1980
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