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2. Water splitting - Wikipedia

   en.wikipedia.org/wiki/Water_splitting

   Electrolysis of water is the decomposition of water (H 2 O) into oxygen (O 2) and hydrogen (H 2): [2] Water electrolysis ship Hydrogen Challenger. Production of hydrogen from water is energy intensive. Usually, the electricity consumed is more valuable than the hydrogen produced, so this method has not been widely used.

3. High-pressure electrolysis - Wikipedia

   en.wikipedia.org/wiki/High-pressure_electrolysis

   High-pressure electrolysis is being investigated by the DOE for efficient production of hydrogen from water. The target total in 2005 is $4.75 per gge H 2 at an efficiency of 64%. [10] The total goal for the DOE in 2010 is $2.85 per gge H 2 at an efficiency of 75%. [11] As of 2005 the DOE provided a total of $1,563,882 worth of funding for ...

4. Electrolysis of water - Wikipedia

   en.wikipedia.org/wiki/Electrolysis_of_water

   Considering the industrial production of hydrogen, and using current best processes for water electrolysis (PEM or alkaline electrolysis) which have an effective electrical efficiency of 70–80%, [68] [73] [74] producing 1 kg of hydrogen (which has a specific energy of 143 MJ/kg) requires 50–55 kW⋅h (180–200 MJ) of electricity.

5. Photocatalytic water splitting - Wikipedia

   en.wikipedia.org/wiki/Photocatalytic_water_splitting

   Photocatalytic water splitting is a process that uses photocatalysis for the dissociation of water (H 2 O) into hydrogen (H 2) and oxygen (O 2). The inputs are light energy , water, and a catalyst(s). The process is inspired by Photosynthesis, which converts water and carbon dioxide into oxygen and carbohydrates.

6. Photoelectrolysis of water - Wikipedia

   en.wikipedia.org/wiki/Photoelectrolysis_of_water

   As part of a sustainable hydrogen economy, photoelectrolysis presents a promising avenue for clean hydrogen production. Although currently more expensive than traditional methods like steam methane reforming, the potential for technological advancements could make it more economically viable.

7. Hydrogen production - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_production

   High pressure electrolysis is the electrolysis of water by decomposition of water (H 2 O) into oxygen (O 2) and hydrogen gas (H 2) by means of an electric current being passed through the water. The difference with a standard electrolyzer is the compressed hydrogen output around 120–200 bar (1740–2900 psi , 12–20 MPa ). [ 146 ]