The heavy reliance on depleting res

严重依赖消耗化石燃料的资源导致了能源危机的加剧。据说可再生能源是能源危机的关键。这就是为什么用可再生能源替代化石燃料的主要原因。燃料电池被认为是替代化石燃料的可再生能源的未来。PEMFC是一种将氢能直接转化为电能的能量转换装置（固定发电），可用于为电动汽车的全部或部分动力提供动力。高成本，PEMFC的性能和使用寿命障碍使燃料电池汽车无法批量生产。《维也纳气候变化谈判报告》显示，能源效率可以低成本实现实际的减排。所以，<br>能源效率是PEMFC性能的衡量标准。能量效率不仅取决于运行条件，还取决于动态运行特性。在这种情况下，由于与其他设计条件相比，燃料电池具有更好的性能，因此其运行条件受到了越来越多的关注。

严重依赖消耗矿物燃料资源导致能源危机加剧。可再生能源被认为是能源危机的关键。这就是用可再生能源取代化石燃料的主要原因。燃料电池被认为是替代化石燃料的可再生能源的未来。PEMFC 是一种能量转换装置（固定功率发电），通过将氢能直接转化为电能，用于为电动汽车的全部或部分推进提供动力。高昂的成本、PEMFC 的性能和使用寿命障碍使燃料电池车辆无法大规模生产。《维也纳气候变化谈判报告》表明，能源效率可以低成本地实现真正的减排。因此，如何解决PEMFC性能不因低成本而退化的问题，已成为质子交换膜燃料电池研究的难点之一。<br>能源效率是衡量 PEMFC 绩效的指标。能效不仅取决于运行条件，还取决于动态的运行特点。在这方面，由于与其他设计条件相比，燃料电池的性能更好，因此操作条件正受到越来越多的关注。

The heavy reliance on depleting resources of fossil fuels have resulted in an increase in energy crisis. （缺个连接词）Renewable energy are said to be the key of energy crisis.This is the major causes why is replacing fossil fuels with renewable energy. Fuel cells are thought to be future of renewable energy source replacing the fossil fuels.PEMFC is an energy conversion devices(stationary power generations) by converting the hydrogen energy directly into electric energy and is used to power all or part of a electric vehicle's propulsion. High costs, the performance of PEMFC and service life hurdles keep fuel cell vehicle from mass production. The Vienna Climate Change Talks Report shows that energy efficiency can achieve real emission reductions at low cost. Therefore, how to solve the performance of PEMFC which is not degraded by lower-cost has become one of the difficulties in Proton-exchange membrane fuel cell researches.The energy efficiency is the measure of performance for PEMFC. The energy efficiency is not only determined by the operating conditions, but also by the operation characteristics on dynamic. In this context, the operating conditions has been receiving an increasing attention, thanks to its better performance of the fuel cell if compared with the other design conditions.<br>