Transient phenomena in automotive f

目前对汽车燃料电池中的瞬态现象了解甚少。除了涉及不同时间尺度的复杂动态响应外，还观察到PEFC中MEA的严重退化，并归因于瞬态运行；这是由于瞬态运行引起的。这些包括燃料/氧化剂短缺，膜干dry，电极溢流和电压反转[3,4]。<br>Um等人[5]于2000年首次探索了由于气体反应物传输至催化位点而引起的一种简单类型的瞬态现象，最近，Yan等人[5]进一步对其进行了建模。[6]和Shimpalee等。[7]。这种瞬态现象通常发生在亚秒级范围内。

目前对汽车燃料电池中的瞬态现象知之甚少。除了涉及各种时间尺度的复杂动态响应外，还观察到PEFC中 MEA 的严重退化，并归因于瞬态操作;其中包括燃料/氧化剂饥饿、膜干涸、电极泛洪和电压反转 [3，4]。一个简单的<br>2000年，Um等人首次探索了由于气体反应物向催化场址的瞬变类型[5]，最近又由Yan等人[6]和Shimpalee等人[7]进一步建模。这种瞬态现象通常发生在次秒范围内。

Transient phenomena in automotive fuel cells are poorly understood at present. In addition to the complex dynamic response involving various time scales, severe degradation of MEAs in a PEFC has been observed and attributed to the transient operation; these include fuel/oxidant starvation, membrane dry out, electrode flooding, and voltage reversal [3,4]. A simpletype of transients due to gas reactant transport to the catalytic sites was first explored by Um et al.[5]in 2000 and most recently further modeled by Yan et al. [6] and Shimpalee et al. [7]. This transient phenomenon typically occurs in the sub-second range.<br>