New load cycling strategy for enhanced durability of high temperature proton exchange membrane fuel cell
New load cycling strategy for enhanced durability of high temperature proton exchange membrane fuel cell
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DOI：
10.1016/j.ijhydene.2017.09.018
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发表时间：
2017-11
影响因子：
7.2
通讯作者：
Sobi Thomas;Christian Jeppesen;T. Steenberg;Samuel Simon Araya;Jakob Rabjerg Vang;S. Kær
中科院分区：
文献类型：
--
作者：
Sobi Thomas;Christian Jeppesen;T. Steenberg;Samuel Simon Araya;Jakob Rabjerg Vang;S. Kær
本文的目的是开发一种新的操作策略，以增加高温质子交换膜（HT-PEMFC）燃料电池系统的寿命，通过使用负载循环模式，以减少磷酸从燃料电池的损失。四个单电池在不同的电流循环曲线下运行，而一个电池在恒定电流密度下运行以进行比较。在测试过程中记录极化曲线和电化学阻抗谱测量并进行分析。选择两种不同的电流密度，低端为0.2 Acm-2，高端为0.8 Acm-2，用于负载循环操作。弛豫时间是在低电流密度操作下花费的时间段，其被改变以理解在延长的时间段内性能如何表现。基于弛豫时间选择高电流密度操作的持续时间，以便对于所有电池具有相同的平均电流密度（0.55Acm-2）。弛豫时间为2 min的电池5表现最佳，与弛豫时间较小的其他负载循环电池相比，其降解速率较低，为36 μVh− 1。在恒定电流密度下操作的电池显示出57 μVh−1的降解速率，其比电池5的降解速率高1.5倍。
The objective of this paper is to develop a new operational strategy to increase the lifetime of a high temperature proton exchange membrane (HT-PEMFCs) fuel cell system by using load cycling patterns to reduce the phosphoric acid loss from the fuel cell. Four single cells were operated under different current cycling profile, while one cell was operated at constant current density for comparison. Polarization curves and electrochemical impedance spectroscopy measurements were recorded during the course of the tests and analysed. Two different current densities, 0.2 Acm−2for the lower end and 0.8 Acm−2for the higher end, were selected for the load cycling operation. The relaxation time, which is the period of time spent at low current density operation, is varied to understand how the performance over prolonged period behaves. The duration of the high current density operation is selected based on the relaxation time in order to have the same average current density of (0.55 Acm−2) for all the cells. Cell 5, with a relaxation time of 2 min performs best and shows lower degradation rate of 36 μVh−1compared to other load cycling cells with smaller relaxation times. The cell operated at constant current density shows a degradation rate of 57 μVh−1, which is 1.5 times higher than the degradation rate of cell 5.