Electrochemical toxic gas sensors are micro fuel cells, designed to be maintenance-free and stable for long periods.

电化学毒气传感器是一种微燃料电池元件，不必保养而可以有长期的稳定性。

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Two of the world's biggest electronics makers, Hitachi and Toshiba, are currently competing against each other to come up with an alternative, most likely to be micro fuel cells.

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The heat is supplied by sources that range from waste-to-energy facilities and biomass boilers to micro-CHP fuel cells and solar-thermal arrays.

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Natural gas-fueled micro-cogeneration and fuel cells are just starting to proliferate.

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