Hydrogen is a clean burning fuel that has been proposed as a substitute for gasoline in the transportation sector, as well as an important feedstock for ammonia fertilizers essential to the global fuel supply. Research firm Markets and Markets expects the global market for hydrogen generation to reach over $154.74 Billion by 2022, growing at a CAGR of 6.07% over the forecast period. Unfortunately, the current process which dominates hydrogen generation converts fossil fuels into hydrogen and releases significant amounts of carbon dioxide (CO2) and other greenhouse gases. In order for hydrogen to become a truly clean technology new methods of generation must be found. One promising early stage solution is the splitting of water into hydrogen and oxygen using solar energy from semiconductor cells.
from Energy Innovation Portal Technology Ticker https://techportal.eere.energy.gov/technology.do/techID=1572
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