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Hydrogen technologies are technologies that relate to the production and use of hydrogen as a part hydrogen economy. Hydrogen technologies are applicable for many uses.

Some hydrogen technologies are carbon neutral and could have a role in preventing climate change and a possible future hydrogen economy. Hydrogen is a chemical widely used in various applications including ammonia production, oil refining and energy.^[1] The most common methods for producing hydrogen on an industrial scale are: Steam reforming, oil reforming, coal gasification, water electrolysis.^[2]

Hydrogen is not a primary energy source, because it is not naturally occurring as a fuel. It is, however, widely regarded as an ideal energy storage medium, due to the ease with which electricity can convert water into hydrogen and oxygen through electrolysis and can be converted back to electrical power using a fuel cell or hydrogen turbine.^[3] There are a wide number of different types of fuel and electrolysis cells.^[4]

The potential environmental impact depends primarily on the methods used to generate hydrogen as a fuel.

Fuel cells

Alkaline fuel cell (AFC)
Direct borohydride fuel cell (DBFC)
Direct carbon fuel cell (DCFC)
Direct ethanol fuel cell (DEFC)
Direct methanol fuel cell (DMFC)
Electro-galvanic fuel cell (EGFC)
Flow battery (RFC)
Formic acid fuel cell (FAFC)
Metal hydride fuel cell (MHFC)
Microbial fuel cell (MFC)
Molten carbonate fuel cell (MCFC)
Phosphoric acid fuel cell (PAFC)
Photoelectrochemical cell (PEC)
Proton-exchange membrane fuel cell (PEMFC)
Protonic ceramic fuel cell (PCFC)
Regenerative fuel cell (RFC)
Solid oxide fuel cell (SOFC)

Hydrogen infrastructure

Hydrogen storage

Hydrogen vehicles

Historic hydrogen filled airships

Hydrogen powered cars

Audi:

2004 – Audi A2H2-hybrid vehicle
2009 – Audi Q5-FCEV^[5]

BMW:

2002 – BMW 750hl
2010 – BMW 1 Series Fuel-cell hybrid electric^[6]

Chrysler:

2000 – Jeep Commander II-hybrid vehicle-Commercial
2001 – Chrysler Natrium-hybrid vehicle
2003 – Jeep Treo-Fuel cell

Daimler:

1994 – Mercedes-Benz NECAR 1
1996 – Mercedes-Benz NECAR 2
1997 – Mercedes-Benz NECAR 3
1999 – Mercedes-Benz NECAR 4
2000 – Mercedes-Benz NECAR 5
2002 – Mercedes-Benz F-Cell based on the Mercedes-Benz A-Class
2005 – Mercedes-Benz F600 Hygenius
2009 – Mercedes-Benz F-CELL Roadster
2009 – Mercedes-Benz F-Cell based on the Mercedes-Benz B-Class^[7]

Fiat:

2001 – Fiat Seicento Elettra H2 Fuel Cell-hybrid vehicle
2003 – Fiat Seicento Hydrogen-hybrid vehicle
2005 – Fiat Panda Hydrogen-Fuel cell
2008 – Fiat Phyllis-Fuel cell
2008 – Fiat Panda-Fiat Panda HyTRAN^[8]

Ford:

2000 – Ford Focus FCV-Fuel cell. Note however that Ford Motor Company has dropped its plans to develop hydrogen cars, stating that "The next major step in Ford’s plan is to increase over time the volume of electrified vehicles".^[9]
2006 – F-250 Super Chief a Tri-Flex engine concept pickup.

Forze Hydrogen-Electric Racing Team Delft

2016 – Forze-Fuel cell

General Motors:

Honda:

2002 – Honda FCX – hybrid vehicle
2007 – Honda FCX Clarity – Hydrogen Fuel cell – Production model

Hyundai:

2001 – Hyundai Santa Fe FCEV
2010 – Hyundai ix35 FCEV^[11]

Lotus Engineering:

2010 – Black Cab-Fuel cell^[12]

Kia:

2009 – Kia Borrego FCEV-Fuel cell^[13]

Mazda:

1991 – Mazda HR-X Hydrogen Wankel Rotary.
1993 – Mazda HR-X2 Hydrogen Wankel Rotary.
1993 – Mazda MX-5 Miata Hydrogen Wankel Rotary.
1995 – Mazda Capella Cargo, first public street test of the hydrogen Wankel Rotary engine.
1997 – Mazda Demio FC-EV Methanol-Reducing Fuel Cell
2001 – Mazda Premacy FC-EV – First public street test of the Methanol-Reducing Fuel Cell vehicle in Japan
2003 – Mazda RX-8 Hydrogen RE Hydrogen \ Gasoline hybrid Wankel Rotary.
2007 – Mazda Premacy Hydrogen RE Hybrid
2009 – Mazda 5 Hydrogen RE Hybrid^[14]

Mitsubishi:

2004 – Mitsubishi FCV

Morgan:

2005 – Morgan LIFEcar-hybrid vehicle-concept car

Nissan:

2002 – Nissan X-Trail FCHV-hybrid vehicle. Note, however that in 2009, Nissan announced that it is cancelling its hydrogen car R&D efforts.^[15]

Peugeot:

2004 – Peugeot Quark
2006 – Peugeot 207 Epure
2008 – H2Origin-Fuel cell

Renault:

Scenic ZEV H2 is a hydro-electric MPV co-developed by Nissan.

Riversimple:

2009 – Riversimple Urban Car

Ronn Motor Company:

2008 – Ronn Motor Scorpion

Toyota:

2002 – Toyota FCHV-hybrid vehicle
2003 – Toyota Fine-S-concept car
2003 – Toyota Fine-N-concept car
2005 – Toyota Fine-T-concept car
2005 – Toyota Fine-X-concept car
2008 – Toyota FCHV-adv-preproduction vehicle (expected public release 2015) ^[16]

Volkswagen:

Hydrogen powered planes

Hyfish
Smartfish
Tupolev Tu-155-hydrogen-powered version of Tu-154^[17]
Antares DLR-H2 -The first aircraft capable of performing a complete flight on fuel-cell power only

Possible future aircraft using precooled jet engines include Reaction Engines Skylon and the Reaction Engines A2.