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TOV Forums > Today's Reading Links > > Re: Solar Panel Splits Water To Produce Hydrogen

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nightflow
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Solar Panel Splits Water To Produce Hydrogen    (Score: 1, Normal) 03-16-2019 12:20
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Solar Panel Splits Water To Produce Hydrogen
https://science.slashdot.org/story/19/03/16/0649220/solar-panel-splits-water-to-produce-hydrogen

"A team at Katholieke Universiteit Leuven, or KU Leuven, says it has developed a solar panel that converts sunlight directly into hydrogen using moisture in the air. The prototype takes the water vapor and splits it into hydrogen and oxygen molecules. If it scales successfully, the technology could help address a major challenge facing the hydrogen economy. A small but growing number of facilities are producing "green" hydrogen using electrolysis, which splits water molecules using electricity -- ideally from renewable sources such as wind and solar. Other researchers, including the team in Belgium, are developing what's called direct solar water-splitting technologies. These use chemical and biological components to split water directly on the solar panel, forgoing the need for large, expensive electrolysis plants.

KU Leuven sits on a grassy campus in Flanders, the Dutch-speaking northern region of Belgium. Earlier this month, professor Johan Martens and his team at the Center for Surface Chemistry and Catalysis announced their prototype could produce 250 liters of hydrogen per day on average over a full year, which they claim is a world record. A family living in a well-insulated Belgian house could use about 20 of these panels to meet their power and heating needs during an entire year, they predict. The solar panel measures 1.65 meters long -- roughly the height of a kitchen refrigerator, or this reporter -- and has a rated power output of about 210 watts. The system can convert 15 percent of the solar energy it receives into hydrogen, the team says. That's a significant leap from 0.1 percent efficiency they first achieved 10 years ago."

TonyEX
Profile for TonyEX
Re: Solar Panel Splits Water To Produce Hydrogen    (Score: 1, Normal) 03-16-2019 20:02
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nightflow wrote:
Solar Panel Splits Water To Produce Hydrogen
https://science.slashdot.org/story/19/03/16/0649220/solar-panel-splits-water-to-produce-hydrogen

"A team at Katholieke Universiteit Leuven, or KU Leuven, says it has developed a solar panel that converts sunlight directly into hydrogen using moisture in the air. The prototype takes the water vapor and splits it into hydrogen and oxygen molecules. If it scales successfully, the technology could help address a major challenge facing the hydrogen economy. A small but growing number of facilities are producing "green" hydrogen using electrolysis, which splits water molecules using electricity -- ideally from renewable sources such as wind and solar. Other researchers, including the team in Belgium, are developing what's called direct solar water-splitting technologies. These use chemical and biological components to split water directly on the solar panel, forgoing the need for large, expensive electrolysis plants.

KU Leuven sits on a grassy campus in Flanders, the Dutch-speaking northern region of Belgium. Earlier this month, professor Johan Martens and his team at the Center for Surface Chemistry and Catalysis announced their prototype could produce 250 liters of hydrogen per day on average over a full year, which they claim is a world record. A family living in a well-insulated Belgian house could use about 20 of these panels to meet their power and heating needs during an entire year, they predict. The solar panel measures 1.65 meters long -- roughly the height of a kitchen refrigerator, or this reporter -- and has a rated power output of about 210 watts. The system can convert 15 percent of the solar energy it receives into hydrogen, the team says. That's a significant leap from 0.1 percent efficiency they first achieved 10 years ago."



I don't think that's a lot of hydrogen. Cars use up a lot more energy than houses, that's why the JDM only home adaptor for the Honda FC could power a japanese sized home for almost two weeks with the FCEV.

I've been looking for the energy in a Kg of H2 when run through a Fuel Cell (not burnt as in ICE or a steam generator). Also, need to know the efficiency of the Honda and Toyota fuel cells.

Also, for automotive use, you have to take into account the energy required to compress the H2 to H70.

Here is something:

https://hypertextbook.com/facts/2005/MichelleFung.shtml

So, the claim is that Kg has 33.3 Kw. ( forget the Kwh number, that is a rate, not an absolute energy number... and likely is affected by the tool used to turn the latent energy into electricity)

So, a 5.75 Kg car has ~192 Kw in its tanks.

My house uses, in the winter, 800 Kwh.... 800 kw. So my Clarity could power my American sized home for a week in the winter.

In the summer, with the AC, we use 1200 Kwh... so my car holds about 1/6 of my needs.

Hmm... one fill up is about $92, times 6, it comes out to $552.

The Calizuelans running our grid charge us almost $500 bucks for 1200 kwh.... so, I guess I need to get me one of them JDM power converters and use all that free H2 we get in the lease terms...

In the winter it doesn't pay so much as our electric rate is progressive: the more you use, the more they charge. Until, of course, the day the entire state pulls a Caracas and goes dark... then I'll need my car to keep a couple of lights on and the fridge/freezer going.




 
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