Fuel cell is a provisional energy source in 21st century to handle the construction of hydrogen-based sustainable-energy societies. This report focus on variety types of fuel cells and their practical applications as dispersed energy source systems. Their contribution for power system will be expected regarding efficiency and exploitation of renewable energy. Especially, SOFC (Solid Oxide Fuel Cell) system is a prospective energy system to serve electric and thermal energy for its highest operation temperature so that the environmental issue would be handled.
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