Hydrogen Energy by Bahman Zohuri

Author:Bahman Zohuri
Language: eng
Format: epub
ISBN: 9783319934617
Publisher: Springer International Publishing

Alkali Fuel Cell

Alkali fuel cells (see Fig. 5.2) operate on compressed hydrogen and oxygen. They generally use a solution of potassium hydroxide (chemically, KOH) in water as their electrolyte. Efficiency is about 70%, and operating temperature is 150–200 °C (about 300–400 °F). Cell output ranges from 300 W to 5 kW. Alkali cells were used in Apollo spacecraft to provide both electricity and drinking water. However, they require pure hydrogen fuel, and their platinum electrode catalysts are expensive. And, like, any container filled with liquid, they can leak.

Fig. 5.2Alkali fuel cell. (Courtesy of the Smithsonian Institution)

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