Handheld breathalyzers typically use this type of device to measure BAC. Graphite plates with gas diffusion panels named bipolar plates are used to separate stacks of these devices. Carbon trioxide exchange drives the Molten Carbonate form of these devices. Yttrium-stabilized Zirconia and Nafion can be used as the central electrolyte in these devices. Steam reforming and gasification can be followed by the water gas shift reaction to produce the (*) major input to these devices. Methanol and ethanol can be used as alternatives for that input in the same way as the Proton Exchange Membrane version. They're not solar panels but the Space shuttle used these devices for 
Handheld breathalyzers typically use this type of device to measure BAC. Graphite plates with gas diffusion panels named bipolar plates are used to separate stacks of these devices. Carbon trioxide exchange drives the Molten Carbonate form of these devices. Yttrium-stabilized Zirconia and Nafion can be used as the central electrolyte in these devices. Steam reforming and gasification can be followed by the water gas shift reaction to produce the (*) major input to these devices. Methanol and ethanol can be used as alternatives for that input in the same way as the Proton Exchange Membrane version. They're not solar panels but the Space shuttle used these devices for electricity since they also produce water as their only physical byproduct. For 10 points, name these devices that typically produce energy from hydrogen.
Handheld breathalyzers typically use this type of device to measure BAC.
fuel cells [accept specific types like hydrogen fuel cell]