What's mean Types of fuel cells -PEMFC system ? by mary lv

What's mean Types of fuel cells -PEMFC system ? What's mean batteryTypes of fuel cells -PEMFC system ?Several variations of fuel cell systems have emerged. The most common are the previously mentioned and most widely developed PEMFC systems using a polymer electrolyte. This system is aimed at vehicles and portable electronics. Several developers are also targeting stationary applications. The alkaline system, which uses a liquid electrolyte, is the preferred fuel cell for aerospace applications, including the space shuttle. Molten carbonate, phosphoric acid and solid oxide fuel cells are reserved for stationary applications, such as power generating plants for electric utilities. Among these stationary systems, the solid oxide fuel cell system is the least developed but has received renewed attention due to breakthroughs in cell material and stack designs. The PEMFC system allows compact designs and achieves a high energy to weight ratio. Another advantage is a quick start-up when hydrogen is applied. The stack runs at a low temperature of about 80°C (176°F). The efficiency is about 50 percent (in comparison, the internal compaction motor has an efficiency of about 15 percent). more info:www.good-battery.com

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