Some of the fuel cells achieved even higher efficiencies than this (Stimming)
 Based on recent reports for example Nissan and Suzuki (Comline)
 From JPL Website "Description of Direct Oxidation, Liquid Feed Methanol Fuel Cell", updated 14Jun1996 "efficiency is projected to increase to >40% with the use of advanced materials".
The PEFC has only 51.5 units and the DMFC has only 46.8 units.
Not shown however is that the PEFC operating at ambient air pressure and using hydrogen as its fuel would be the most efficient fuel cell without using a bottoming cycle such as a gas turbine.
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The Direct Alcohol Fuel Cell or DAFC appears to be the most promising as a battery replacement for portable applications such as cellular phones and laptop computers.
Others say that the much higher efficiency of the SOFC and its ability to use most any fuel will make it a logical choice for vehicular applications as well.
The SOFC may well be suited to at least certain vehicles which run more continuously.
Because of the high temperatures of the SOFC, they may not be practical for sizes much below 1,000 watts or when small to midsize portable applications are involved.
Small SOFC will be about 50% efficient  from about 15%-100% power.
Chinese, looking back on history, have been evolving for over 4000 years that many characters have approached aesthetic perfection. They are wonderful designs combining sounds, calligraphy and meanings. The following list is the corresponding Chinese symbols for "photosynthesis".
Note: Just like English many Chinese words may have various meanings and full of nuances, so for accurate translations.
On the anode side, natural gas is first ejected into a reforming chamber where it draws waste thermal energy from the stack and is converted into hydrogen and carbon monoxide.
This results in some of the high temperature waste thermal energy being recycled back into the fuel.
Because the chemical reactions in the SOFC are good at the high operating temperatures, air compression is not required.
In this type of fuel cell, either methyl DMFC or ethyl DEFC alcohol is not reformed into hydrogen gas but is used directly in a very simple type of fuel cell.
In the PEFC an external reformer is required to produce hydrogen gas while the SOFC can reform these fuels into hydrogen and carbon monoxide inside the cell.
Presently the power density of the DEFC is only 50% of the DMFC but hopefully this can be improved in the future.
Fuel crossing over from the anode to the cathode without producing electricity is one problem that has restricted this technology from its inception.
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This is because it is simple, highly efficient, tolerant to impurities, and can at least partially internally reform hydrocarbon fuels.
The SOFC runs at a red-hot temperature of 700-1000°C.
Another problem however is that there are often chemical compounds formed during operation that poison the catalyst.
There are already working DMFC prototypes used by the military for powering electronic equipment in the field.