Photohydrogen

Photohydrogen

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 for us to breathe) [ [http://www.pbs.org/wgbh/nova/sciencenow/3210/01.html NOVA scienceNOW] - A 14 minute video of the NOVA broadcast about hydrogen fuel cell cars that aired on PBS, July 26, 2005. Hosted by Robert Krulwich with guests, Ray and Tom Magliozzi, the "Car Talk" brothers.] . Photohydrogen may also be produced by the photodissociation of water by ultraviolet light.

Photohydrogen is sometimes discussed in the context of obtaining renewable energy from sunlight, by using microscopic organisms such as bacteria or algae. These organisms create hydrogen with the help of hydrogenase enzymes which convert protons derived from the water splitting reaction into hydrogen gas which can then be collected and used as a biofuel.cite web|url=http://www.wired.com/news/technology/0,1282,54456,00.html |title=Algae: Power Plant of the Future? |accessdate=2006-09-17 |last=Gartner |first=John |date=2002-08-19 |publisher=Wired |pages=1] cite web|url=http://www.wired.com/wired/archive/10.04/mustread.html?pg=5 |title=It Came From the Swamp |accessdate=2006-09-17 |last=Mechanic |first=Michael |year=2002 |month=April |publisher=Wired |pages=1]

See also

* Photofermentation
* Biological hydrogen production (Algae)
* Photoelectrochemical cell
* Photosynthesis
* Hydrogen cycle
* Hydrogen economy

References

External links


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  • Photofermentation — is the fermentative conversion of organic substrate to biohydrogen manifested by a diverse group of photosynthetic bacteria by a series of biochemical reactions involving three steps similar to anaerobic conversion. Photofermentation differs from …   Wikipedia

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