Hydrogen production

thumb|Illustration of a Hofmann voltameter|Hofmann electrolysis apparatus used in a school laboratory

thumb|right|Nineteenth-century electrolytic cell for producing oxyhydrogen Oxyhydrogen is a mixture of hydrogen (H2) and oxygen (O2) gases. This gaseous mixture is used for torches to process refractory materials and was the first

mixture of carbon monoxide and hydrogen

decomposition of water into oxygen and hydrogen gas due to the passage of an electric current

family of industrial methods for generating hydrogen

species of algae

process of photosynthesis

method for producing hydrogen, carbon monoxide, or other useful products from hydrocarbon fuels

Apparatus for electrolysing water

thumb|Microbial hydrogen production. Biohydrogen is H2 that is produced biologically. Interest is high in this technology because H2 is a clean fuel and can be readily produced from certain kinds of biomass, including biological waste. Furthermore some photosynthetic microorganisms are capable of producing H2 directly from water splitting using light as energy source.

substance (fuel) or sometimes a phenomenon (energy system) that contains energy that can be later converted to other forms such as mechanical work or heat or to operate chemical or physical processes

chemical reaction

thermochemical process used to produce hydrogen

sources of electricity or hydrogen via electrolysis

technics

chemical reaction in which water is broken down into oxygen and hydrogen

technique for producing hydrogen from water

method to prepare organofluorine compounds using electrolysis

thermochemical Cycle to produce Hydrogen from Water

branch of engineering dealing with the technological applications of electrochemical phenomena

water-splitting process

method of producing carbon black and hydrogen gas from hydrocarbons

In photochemistry, photohydrogen is hydrogen produced with the help of artificial or natural light. This is how the leaf of a tree splits water molecules into protons (hydrogen ions), electrons (to make carbohydrates) and oxygen (released into the air as a waste product). Photohydrogen may also be produced by the photodissociation of water by ultraviolet light.

Polymer electrolyte membrane electrolysis

chemical reaction

transformation of Fe(OH)2 into Fe3O4 with hydrogen release

Electrolysis facilitated by light

combinations between different technologies to generate electric power

Electrohydrogenesis or biocatalyzed electrolysis is the name given to a process for generating hydrogen gas from organic matter being decomposed by bacteria. This process uses a modified fuel cell to contain the organic matter and water. A small amount, 0.2–0.8 V of electricity is used, the original article reports an overall energy efficiency of 288% can be achieved (this is computed relative to the amount of electricity used, waste heat lowers the overall efficiency). This work was reported by Cheng and Logan.

conversion of organic substrate to biohydrogen

type of fuel cell

type of bioelectrochemical system