- 1900 - Count Ferdinand von Zeppelin launched the first hydrogen-filled Zeppelin LZ1 airship.
- 1913 - Niels Bohr explains the Rydberg formula for the spectrum of hydrogen by imposing a quantization condition on classical orbits of the electron in hydrogen.
- 1918 - Charles H. Frazer patented "Hydrogen Booster" system for internal combustion engines.
- 1923 - J. B. S. Haldane envisioned in Daedalus; or, Science and the Future "great power stations where during windy weather the surplus power will be used for the electrolytic decomposition of water into oxygen and hydrogen."
- 1930 - Rudolf Erren - Erren engine - GB patent GB364180 - Improvements in and relating to internal combustion engines using a mixture of hydrogen and oxygen as fuel
- 1935 - Inventor Charles H. Garrett patented an "electrolytic carburator" and demonstrated a car which ran on tap water.
- 1939 - Rudolf Erren - Erren engine - US patent 2,183,674 - Internal combustion engine using hydrogen as fuel
- 1941 - The first mass application of hydrogen in internal combustion engines: Russian lieutenant Boris Shelishch in the besieged Leningrad has converted some hundreds of cars "GAZ-AA"
- 1943 - Arne Zetterström describes hydrox
- 1959 - Francis Thomas Bacon built the Bacon Cell, the first practical 5 kW hydrogen-air fuel cell to power a welding machine.
- 1965 - The first commercial use of a fuel cell in Project Gemini.
- 1966 - General Motors presents Electrovan, the world's first fuel cell automobile.
- 1970 - John Bockris or Lawrence W. Jones coined the term hydrogen economy
- 1973 - The 30 km hydrogen pipeline in Isbergues
- 1975 - Yull Brown, Australian scientist, files patent on his design of a Brown's Gas electrolyzer.
- 1975 - John Bockris writes Energy The Solar-Hydrogen Alternative
- 1977 - The NASA Lewis Research Center conducted a series of tests on a large block American-made V8 piston engine, injected with hydrogen gas.
- 1990 - The first solar-powered hydrogen production plant Solar-Wasserstoff-Bayern became operational.
- 1990 - Mr. Stanley A. Meyer acquired a patent on a method for the production of an Oxygen-Hydrogen Fuel Gas (US Patent 4,936,961)
- 1998 - Icelandic Parliament decides to convert vehicles and fishing fleets to hydrogen
- 1999 - Iceland unveiles plan to create the first hydrogen economy.
- 2001 - Honda produces hydrogen from water and solar power
- 2003 - Mazda releases RX-8 Hydrogen RE in which the engine is configured to run on either hydrogen or gasoline.
- 2004 - U.S. Energy Secretary Spencer Abraham announces over $350 million devoted to hydrogen research
- 2005 - BMW launches Hydrogen 7, with an internal combustion engine fitted to run on hydrogen
- 2006 - Ford introduced their concept F250 Super Chief pickup truck, which can run on hydrogen, ethanol or gasoline.
- 2013 - US government releases information on water powered hybrid being delpoyed
- 2015 - Sweden's first hydrogen filling stations inaugurated
- 2015- Totota announces plans to release car "Powered by Water"