Saturday, March 20, 2010

Carbon nanotubes

Carbon nanotubes with nitrogen doping for fuel cells cheaper.
Nano-sized carbon tubes (nanotubes) which didoping with nitrogen has the potential to replace expensive platinum catalysts used to reduce oxygen in fuel cells, according to researchers at Ohio (Science 2009, 323, 760). This discovery could reduce the price of fuel cells, which is a promising technology but has a problem to apply on a large scale as in motor vehicles because of high prices in addition to the catalyst in terms of durability.

Didoping nanotubes made of carbon didoping yellow with blue nitrogen that could replace platinum catalysts in fuel cells.

A team led by Liming Dai of the University of Dayton found that a group composed of carbon nanotubes vertically reply, which some carbon atoms can be replaced with nitrogen to reduce oxygen in alkaline solution is better than platinum catalysts which have long been used in fuel cell technology since the 1960s. Moreover, the nanotubes are not affected by the toxic carbon monoxide catalyst in the form of a platinum catalyst proved mendeaktivasi.

Dai explained the main causes of the high activity of nitrogen berdoping nanotubes because the ability to accept electrons from the nitrogen atom will produce a positive charge on carbon atoms next to. These charges attract electrons from the anode and oxygen reduction reaction encouraged. "Disclosure of the new role of nitrogen doping in this study is very important and can be applied to develop a variety of oxygen-reducing catalyst made of an efficient non-metal applications outside of the fuel cells" Dai said.

"This discovery could have a fundamental effect on efforts to commercialization of fuel cell technology, said Yushan Yan, a professor of chemical engineering from the University of California, Riverside. He added that these results can be more real impact if the team can show the results of Dai experiment in acidic media, where platinum is more necessary in such an atmosphere, compared with alkaline media, where there is no other metal is more effective than platinum in acid atmosphere. But knowing that the platinum can be replaced with new non-metal catalyst is already a remarkable progress.

Carbon nanotubes with nitrogen doping for fuel cells cheaper.
Nano-sized carbon tubes (nanotubes) which didoping with nitrogen has the potential to replace expensive platinum catalysts used to reduce oxygen in fuel cells, according to researchers at Ohio (Science 2009, 323, 760). This discovery could reduce the price of fuel cells, which is a promising technology but has a problem to apply on a large scale as in motor vehicles because of high prices in addition to the catalyst in terms of durability.

Didoping nanotubes made of carbon didoping yellow with blue nitrogen that could replace platinum catalysts in fuel cells.

A team led by Liming Dai of the University of Dayton found that a group composed of carbon nanotubes vertically reply, which some carbon atoms can be replaced with nitrogen to reduce oxygen in alkaline solution is better than platinum catalysts which have long been used in fuel cell technology since the 1960s. Moreover, the nanotubes are not affected by the toxic carbon monoxide catalyst in the form of a platinum catalyst proved mendeaktivasi.

Dai explained the main causes of the high activity of nitrogen berdoping nanotubes because the ability to accept electrons from the nitrogen atom will produce a positive charge on carbon atoms next to. These charges attract electrons from the anode and oxygen reduction reaction encouraged. "Disclosure of the new role of nitrogen doping in this study is very important and can be applied to develop a variety of oxygen-reducing catalyst made of an efficient non-metal applications outside of the fuel cells" Dai said.

"This discovery could have a fundamental effect on efforts to commercialization of fuel cell technology, said Yushan Yan, a professor of chemical engineering from the University of California, Riverside. He added that these results can be more real impact if the team can show the results of Dai experiment in acidic media, where platinum is more necessary in such an atmosphere, compared with alkaline media, where there is no other metal is more effective than platinum in acid atmosphere. But knowing that the platinum can be replaced with new non-metal catalyst is already a remarkable progress.

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