Description
Fuel Cells up to the size that can be used in portable and mobile applications, like gadgets, cars (auxiliary and propulsion power), trains or trucks. Fuel cell technologies include PEM-based cells (proton exchange membrane) and SO-fuel cells (solid oxide) which are under development in small scale. Next generation fuel cells mainly operate with hydrogen but, if combined with a reformer, can also be used with hydrocarbon fuels such as natural gas, propane, ethanol, plastic and diesel (new developments make the use of reformers obsolete). The main application for mass market, small scale fuel cells are portable electronics, automotive and combined heat and power (see "Micro-CHP").An important criterion to evaluate a SOFC's performance is power density measured in watts per square centimetre of surface area (at a certain operating temperature). Cells with a power density above 2W/sqcm (600C) are currently under development.
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