Nov 26
2009

Japanese micro fuel cell R & D in full swing

A few years ago, including Toshiba and NEC, including a number of Japanese companies claimed that they will be available for mobile phones, laptops pavilion zv5000 battery and music players use micro fuel cells. This battery needs charging, just add a little look inside of alcohol on the line, and consumers seem to escape from the shackles of chargers, batteries era seems thus to an end.

However, since it is a silence. Until today, they advocated the fuel cell is also hard to find in the market of its trace, what’s wrong?

Bad branding first cake

In fact, these companies are also the victims. They did not expect, a small fuel cell turned out to be a “difficult birth children.”

The researchers found that the battery inside the material too sensitive to temperature and humidity, but also prone to carbon monoxide poisoning. Their creation of the best portable fuel cell performance, was only reluctantly, and they claim to replace the lithium batteries rather, does not have the market competitiveness.

Is currently being developed are mainly two kinds of fuel cells: proton exchange membrane (PEM HP F4809A) and solid oxide type. Both can make the fuel and air along the opposite direction through the layer of special film.

Exchange membrane PEM coated with a layer of catalyst, this catalyst can be the fuel (usually hydrogen atoms) e away the hydrogen atoms thus become positively charged hydrogen ions, which can be through the film, and on the other side from the oxygen in the air combine to form water. Being taken away, then rush to the charge and hydrogen-ion complex, ever outward migration, this process down and formed a continuous current.

In fact, PEM cells from the 60s of last century had begun to use, it can work at 170 ℃, it is still an acceptable temperature. PEM cells, but there is a fatal weakness: it requires pure hydrogen to produce electronics, now no one can find an economically feasible way to do this. This forced many developing PEM cell manufacturers have turned to alcohol. In comparison, alcohol is certainly cheap, but it contains low-energy, is a weak source of energy.

The working principle of solid oxide type is exactly the opposite. Air, oxygen atoms penetrate into the other side of the membrane, and was taken away electrons with hydrogen atoms and carbon monoxide to form water and carbon dioxide. Because such a high temperature at 1370 ℃ work, solid oxide batteries once abandoned by developers. However, it can use a higher density of hydrocarbons (eg butane) as fuel, and thus can provide much higher than the PEM cell power. In the liquid, the energy density of butane is 7.4 kWh / l, while the methanol only 4.4 kWh / l, lithium batteries are usually only able to provide 0.3 kwh of electricity.

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