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Since hydrogen is not readily available, fuel cell systems often use a fuel reformer or fuel processor that extracts hydrogen from hydrocarbons, such as natural gas or methane gas produced in wastewater treatment plants.
Electrical Current
Also, fuel cells produce direct current, or D/C, electricity. Because alternating current, or A/C, is the electrical standard for most uses, such as home or building power, fuel cells use a power inverter to change the electricity from D/C to A/C.
In transportation applications where hydrogen is available as a direct source, neither the reformer nor inverter are needed.
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