The Electro-Oxidation of H2, CO in a Model PEM Fuel Cell: Oscillations, Chaos, Pulses
The Electro-Oxidation of H2, CO in a Model PEM Fuel Cell: Oscillations, Chaos, Pulses
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DOI：
10.1149/2.002306jes
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Sundmacher, Kai
中科院分区：
文献类型：
--
作者：
Kirsch, Sebastian;Hanke-Rauschenbach, Richard;Sundmacher, Kai
在分布式电流测量的帮助下，在 37 摄氏度下研究了 PEM 燃料电池 (PEMFC) 模型中的 H-2、CO 电氧化。实验的主要目的是验证具有直通道和 H-2 演化阴极的 PEMFC 所预测的时空模式的形成。对于恒电流操作和高进料流量，发现了良好表达的全局耦合振荡。为了降低进料流量，出现倍周期分叉级联。恒电位控制会破坏相邻振荡器之间严格的相位关系，并且会出现脉冲和湍流。如果引入氧还原阴极而不是析氢阴极，则湍流会增强。所有发现均与现有预测进行比较。 PEMFC 工程师对这些模式的研究很感兴趣，因为他们直接确定 PEMFC 的 CO 耐受行为。 (C) 2013 年电化学协会。 [DOI：10.1149/2.002306jes] 保留所有权利。
H-2, CO electro-oxidation in a model PEM Fuel Cell (PEMFC) is investigated at 37 degrees C with the help of distributed current measurements. The main purpose of the experiments is to verify the formation of spatio-temporal patterns that have been predicted for a PEMFC with straight channels and a H-2 evolving cathode. For galvanostatic operation and a high feed flow rate well expressed globally coupled oscillations are found. For decreasing feed flow rate a period doubling bifurcation cascade appears. Potentiostatic control provokes the breakage of the strict phase relation between adjacent oscillators and the appearance of pulses as well as turbulence is seen. The turbulence is enhanced if an oxygen reducing cathode is introduced instead of a hydrogen evolving cathode. All the findings are compared to existing predictions. The study of the patterns is of interest for PEMFC engineers as they directly determine the CO tolerance behavior of the PEMFC. (C) 2013 The Electrochemical Society. [DOI: 10.1149/2.002306jes] All rights reserved.