2012年4月27日金曜日
Nihon steel corp. raises a lawsuit against Posco on the reason of “grain-oriented magnetic steel sheet” patent infringement
2012年4月7日土曜日
Artificial-photosynthesis basis hydrogen generation system
- Light-to-hydrogen conversion efficiency is improved two times, 1.35% -
Writing of the "Technology Details" on this article has been completed. To read more, please feel free to contact us.
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H2 fuel cells still involve many problems to be solved. A typical problem of them is “hydrogen brittlement”. The fuel cells have been much developed and some types of them have entered the early market phase even under the situation, however. In Japan the residential PEFC CHP (combined heat & power cogenerations) systems having been sold are well over 10,000 units in number and installed at ordinary houses and being used for electricity and hot water supply. The CHP systems of the SOFC type have been introduced into the market recently, in addition to the PEFC type CHP systems. FCVs (fuel cell vehicles) will enter the early market phase worldwide in around 2015. Hydrogen is the fuel to those fuel cells. The problem confronting us is how to generate hydrogen as the fuel cleanly, effectively and cheaply.
A hydrogen generation technology is now attracting an attention. The technology is based on the artificial photosynthesis. It originated from Japan. Now, it is being actively investigated widely and worldwide. The hydrogen generation technology generates hydrogen and oxygen by using solar light rays (visible light rays) and a photoelectrode (oxide semiconductor in the technology developed anew, which will be described later), and through the water splitting process.
In the electrolysis conventionally and usually used, paired electrodes are put in an electrolytic solution, and voltage is applied to those electrodes. The voltage difference between the electrodes causes current to flow and to split water. Electric power for the voltage application is fed to the electrolysis system from outside.
On the other hand, the artificial photosynthesis basis hydrogen generation technology excites the photoelectrode by solar light rays and splits water by using current flowing out from the electrode.
A small auxiliary power source is used for assisting the current flow at the present stage of the technology.
In other words, the electrolysis system contains a power source means in itself.
The voltage required to split water is extremely lower than of the conventional electrolysis technology. The auxiliary power source could be reduced to almost zero if the technology further advances.
It is noted that where no auxiliary power source is used, hydrogen is cleanly generated at considerably low voltage.
AIST has recently developed (improved) an innovative artificial photosynthesis basis hydrogen generation technology. The new technology remarkably improves the light-to-hydrogen conversion efficiency. The efficiency = 1.35%. The figure is two times of the conventional electrolysis technology.
A diagram showing a scheme of the artificial-photosynthesis basis hydrogen generation system developed this time is put on my site: http://www.fcpat-japan.com.
Writing of the "Technology Details" on this article has been completed. To read more, please feel free to contact us.
***********************
H2 fuel cells still involve many problems to be solved. A typical problem of them is “hydrogen brittlement”. The fuel cells have been much developed and some types of them have entered the early market phase even under the situation, however. In Japan the residential PEFC CHP (combined heat & power cogenerations) systems having been sold are well over 10,000 units in number and installed at ordinary houses and being used for electricity and hot water supply. The CHP systems of the SOFC type have been introduced into the market recently, in addition to the PEFC type CHP systems. FCVs (fuel cell vehicles) will enter the early market phase worldwide in around 2015. Hydrogen is the fuel to those fuel cells. The problem confronting us is how to generate hydrogen as the fuel cleanly, effectively and cheaply.
A hydrogen generation technology is now attracting an attention. The technology is based on the artificial photosynthesis. It originated from Japan. Now, it is being actively investigated widely and worldwide. The hydrogen generation technology generates hydrogen and oxygen by using solar light rays (visible light rays) and a photoelectrode (oxide semiconductor in the technology developed anew, which will be described later), and through the water splitting process.
In the electrolysis conventionally and usually used, paired electrodes are put in an electrolytic solution, and voltage is applied to those electrodes. The voltage difference between the electrodes causes current to flow and to split water. Electric power for the voltage application is fed to the electrolysis system from outside.
On the other hand, the artificial photosynthesis basis hydrogen generation technology excites the photoelectrode by solar light rays and splits water by using current flowing out from the electrode.
A small auxiliary power source is used for assisting the current flow at the present stage of the technology.
In other words, the electrolysis system contains a power source means in itself.
The voltage required to split water is extremely lower than of the conventional electrolysis technology. The auxiliary power source could be reduced to almost zero if the technology further advances.
It is noted that where no auxiliary power source is used, hydrogen is cleanly generated at considerably low voltage.
AIST has recently developed (improved) an innovative artificial photosynthesis basis hydrogen generation technology. The new technology remarkably improves the light-to-hydrogen conversion efficiency. The efficiency = 1.35%. The figure is two times of the conventional electrolysis technology.
A diagram showing a scheme of the artificial-photosynthesis basis hydrogen generation system developed this time is put on my site: http://www.fcpat-japan.com.
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