Brint

Brint (eller Hydrogen, fra græsk hydro, vand, og genes, danner/dannende) er et grundstof med atomnummer 1 i det periodiske system.

Brint er luftformigt ved atmosfærisk tryk. Fri brint optræder som brintmolekyler, H₂. Brint er brændbart.

Brint har tre kendte isotoper:

1. Det stabile Hydrogen H (¹H) med en nukleon; en proton.
2. Det stabile Deuterium D (²H) med to nukleoner; en proton og en neutron.
3. Det radioaktive Tritium T (³H) med tre nukleoner; en proton og to neutroner.

Det danske navn blev dannet 1814 af H.C. Ørsted ud fra ældre dansk eller svensk brinne (brænde).

Det er blevet anslået, at brint udgør omkring 3/4 af universets masse. På Jorden findes brint primært bundet til andre grundstoffer som i vand og organisk materiale. Der findes en lille smule fri brint i jordens atmosfære (ca. 1 ppm efter volumen). Fri brint fremstilles bl.a. ved elektrolyse af vand.

Se også

• brændselscelle, energi, fusion, pH, zeppeliner, Hydrogenion, Grundstoffer efter atomnummer.

• HyWeb - hydrogen fuel cell energy information
• 2004-08-26, Sciencedaily: Vast New Energy Source Almost Here: Solar Hydrogen Fuel Dream Will Soon Be A Reality, Australian Scientists Predict Citat: "...Using special titanium oxide ceramics that harvest sunlight and split water to produce hydrogen fuel..."
• 2004-02-16, ScienceDaily: New Reactor Puts Hydrogen From Renewable Fuels Within Reach Citat: "...The first reactor capable of producing hydrogen from a renewable fuel source - ethanol - efficiently enough to hold economic potential has been invented by University of Minnesota engineers. When coupled with a hydrogen fuel cell, the unit - small enough to hold in your hand - could generate one kilowatt of power, almost enough to supply an average home, the researchers said...if you used ethanol to make hydrogen for a fuel cell, you would get 60 percent efficiency..."
• MIT, Technology Research News, May 20, 2003: Material Eases Hydrogen Storage
• ScienceDaily, 2003-06-10: Powering Fuel Cells: Oxide Materials May Facilitate Small-scale Hydrogen Production
• Ing.dk, 29.05.2003: Sverige satser på kunstig fotosyntese til brintproduktion
• 25.04.2003 ChevronTexaco klar til at teste nyt brintlager Nyt brintlager, hvor brinten lagres i metalhydrid giver håb om forureningsfri transport.
• BBCNews: 24 December, 2001, Iceland launches energy revolution
• 24.04.2003 Brinttank-station åbnet på Island Verdens første brint-tanksted åbnet på en almindelig tankstation - som led i ambitiøst stor-skala pilot-projekt, som skal teste brint som energiforsyning til transportsektoren.
• Ing.dk, 20.03.2001, BMW´s brintbil kører 226 km/t
• Hydrogen-Based Sustainable Power For The 21st Century
• Ing.dk, 05.07.2001: Norge og Sverige satser på brint
• blad og forum om brint-/hybrid-biler
• 29 January, 2003, The long road for hydrogen
• 21-Dec-2001, UniSci: Hydrogen Atoms Transfer In Same Way As Electrons Do
• June 25, 2003, Common Dreams: Wind Power Set to Become World's Leading Energy Source Citat: "...in contrast to natural gas prices, which are highly volatile and can double in a matter of months, wind prices are declining....Wind power is now a viable, robust, fast-growing industry. Cheap electricity from wind makes it economical to electrolyze water and produce hydrogen...."
• Science Daily, 2003-06-30, New Catalyst Paves Way For Cheap, Renewable Hydrogen
• Number 611 #1, October 29, 2002, Physics News Update: The Internal States of Anti-Hydrogen
• 2004-02-06, ScienceDaily: Seeing How Plants Split Water Could Provide Key To Our Future Energy Needs
• 10 April 2002, PhysicsWeb: Hydrogen metal on the horizon Citat: "...Now an experimental study of solid hydrogen at pressures up to 320 GPa predicts that it will become metallic at a pressure of 450 GPa - over four million times atmospheric pressure...."

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