Structural Transitions Driving Interface Pulses in Methanol Oxidation on Rh(110) and VOx/Rh(110): A LEEM Study

Structural Transitions Driving Interface Pulses in Methanol Oxidation on Rh(110) and VOx/Rh(110): A LEEM Study
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Rh(110) 和 VOx/Rh(110) 甲醇氧化中结构转变驱动界面脉冲:LEEM 研究

DOI:
10.1021/acs.jpcc.1c06106
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发表时间:
2021
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Imbihl
Imbihl
中科院分区:
--
文献类型:
--
作者:
Bernhard von Boehn;Jon-Olaf Krisponeit;Jens Falta;Ronald;Imbihl

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用LEEM(lowenergyelectronmicroscopy)和micro-LEED原位技术,在10 ~(-4)mbar范围内,研究了Rh(110)裸表面和覆盖0.1单层V氧化物的Rh(110)表面上甲醇氧化过程中,行波界面脉冲(TIPs)激发下的结构转变.接近等稳性,(1×1)结构与O诱导的“缺失行”型重建共存于界面处。沿着界面传播的氧化脉冲显示出由各种“缺失行”类型的重建组成的亚结构;在还原表面上,c(2×2)结构的缓慢发展伴随着(0,0)-束强度的强烈损失。添加0.1单层的V氧化物增加结构无序,但不会引起结构转变的质的变化。
With LEEM (low-energy electron microscopy) and micro-LEED asin situtechniques we have studied the structural transitions in the excitation of traveling interface pulses (TIPs) in bistable methanol oxidation on a bare Rh(110) and on a Rh(110) surface covered with a 0.1 monolayer of V oxide in the 10–4mbar range. Close to equistability, a (1×1) structure coexists with O-induced reconstructions of the “missing row” type at the interface. An oxidation pulse traveling along the interface exhibits a substructure consisting of various reconstructions of the “missing row” type; on the reduced surface, the slow development of a c(2×2) structure is accompanied by a strong loss of the (0,0)-beam intensity. The addition of 0.1 monolayer of V oxide increases structural disorder but causes no qualitative changes in the structural transitions.
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