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Light Harvesting, 100% efficient

 
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jabailo



Joined: 20 Mar 2006
Posts: 1273
Location: Kent (East Hill), WA

PostPosted: Thu Nov 08, 2012 4:19 pm    Post subject: Light Harvesting, 100% efficient Reply with quote

Artificial light-harvesting method achieves 100% energy transfer efficiency

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“In order to realize an artificial light-harvesting system, almost 100% efficiency is necessary,” Takagi told PhysOrg.com. “Since light-harvesting systems consist of many steps of energy transfer, the total energy transfer efficiency becomes low if the energy transfer efficiency of each step is 90%. For example, if there are five energy transfer steps, the total energy transfer is 0.9 x 0.9 x 0.9 x 0.9 x 0.9 = 0.59. In this way, an efficient energy transfer reaction plays an important role in realizing efficient sunlight collection for an artificial light-harvesting system.”


http://phys.org/news/2011-09-artificial-light-harvesting-method-energy-efficiency.html

Hydrogen fuel edges a step closer

Quote:
Making hydrogen gas in water just got a little easier. The discovery may lead to inexpensive, practical means of harvesting sunlight to create clean-burning hydrogen for powering cars or generating electricity.

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The new study, published online November 8 in Science, focuses on the light-harvesting side of the equation. The researchers, from the University of Rochester in New York, created tiny particles of cadmium and selenium that spit out electrons when hit with light. The team also needed a catalyst to pass those electrons to hydrogen molecules, which would combine into the useful gas H2.


http://www.sciencenews.org/view/generic/id/346339/description/Hydrogen_fuel_edges_a_step_closer
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jabailo



Joined: 20 Mar 2006
Posts: 1273
Location: Kent (East Hill), WA

PostPosted: Wed May 15, 2013 7:34 pm    Post subject: Reply with quote

Significant Improvement in Performance of Solar-Powered Hydrogen Generation

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Using a powerful combination of microanalytic techniques that simultaneously image photoelectric current and chemical reaction rates across a surface on a micrometer scale, researchers at the National Institute of Standards and Technology (NIST) have shed new light on what may become a cost-effective way to generate hydrogen gas directly from water and sunlight.


http://www.sciencedaily.com/releases/2013/05/130515125118.htm
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