Intermittencies and Related Phenomena in the Oxidation of Formaldehyde at a Constant Current
Intermittencies and Related Phenomena in the Oxidation of Formaldehyde at a Constant Current
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DOI：
10.1021/jp981293
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发表时间：
1998-08
影响因子：
2.9
通讯作者：
H. Okamoto;and Naoki Tanaka;M. Naito
中科院分区：
文献类型：
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作者：
H. Okamoto;and Naoki Tanaka;M. Naito
在43°C下甲醛在Pt上的恒电流氧化中，我们发现了III型间歇性（在pomau - Manneville分类中）和I型间歇性。电位振荡模式随时间变化，在一系列周期振荡中，周期振荡后通常观察到I型间歇，这些周期振荡以周期递减的顺序出现，并穿插在混沌状态之间。在相对较低的电流密度下（例如，在1 mol dm-3甲醛溶液中，电流密度为0.23 mA cm-2或更低），在甲醛浓度为1 mol dm-3或更高的溶液中，我们观察到在序列周期振荡之前的III型间歇性。在其他条件下，我们观察到iii型间歇性模式，随后是反向周期加倍级联。通过第k次和（2k）次回归图的形状，通过层流持续时间与周期k型时间的关系，我们证实了k周期层流的III型间断性特征。
In the galvanostatic oxidation of formaldehyde on Pt at 43 °C, we have found type III intermittency (in the Pomeau−Manneville classification) as well as type I intermittency. Potential oscillation patterns change with time, and type I intermittency is usually observed after a periodic oscillation in a sequence of periodic oscillations, which appear in decreasing order of their periods and are interposed between chaotic states. At a comparatively low current density (e.g., 0.23 mA cm-2 or less for a 1 mol dm-3 formaldehyde solution) in a solution with a formaldehyde concentration of 1 mol dm-3 or more, we observe type III intermittency before a periodic oscillation in the sequence. Under other conditions we observe a type-III-like intermittent pattern followed by a reverse period-doubling cascade. We confirm the characteristics of type III intermittency with a period-k laminar flow by the shape of kth and (2k)th return maps, by the relation between a laminar duration and the time from the period-k pattern,...