Entries Tagged as 'Hydrogen'

Splitting Water with Solar Trees

A recent knowledge release has put forward the idea of splitting water to hydrogen with nano scale silver trees. The idea being that trees absorb more light than flat surfaces. The researchers have found that they can capture sunlight at greater incidence angles and for longer periods during the daylight hours with these little trees. One thing they don’t discuss is what happens to the heat that is also captured by the tress. Is it enough to keep the water from getting too hot and evaporating before it gets split into is constituent parts of hydrogen and oxygen?

In other solar news there is a lot of take in the past couple of weeks about the idea of solar towers. There are various concepts being pushed out that include a solar accordion which folds down into a box for easy portability. They say that due to the falling cost of solar these ideas have now become economically feasible to produce. After all if we can produce televisions at a cheaper price than solar panels there is obviously a long way down for the solar panel industry to go before it reaches the true cost that actually manufacturing and shipping the end product should be once the cost of setting up the plants, building all the machinery and paying for all the scientific research has been covered. Take that massive cost out of the equation and the cost of solar falls so dramatically that the fossil fuel industry has absolutely no way to compete on price.

The only thing left going for the old energy market is that they are already up and running and have a high energy output as well as portability in the case of oil and gas. Definitely the nuclear industry must see the rise of extremely low cost solar as a threat to their ability to build massive and expensive power stations all over the place. Relegating nuclear power to the annals of history and research facilities or space exploration where it belongs. Places where the people in charge have a very real need to keep things in top shape or the will loose their own lives. That tends to make scientists more cautious in the way they handle and care for their nuclear facilities than psuedo government/private cash cows like TEPCO.

Producing Hydrogen from Sunlight and Water

An interesting twist on the Hydrogen production system using sunlight and water to react with copper and aluminium oxide that when heated to 200 Degrees Celsius and combined with “catalytic nano particles” initiate a chemical reaction to quickly release the stored hydrogen. The Hydrogen is then fed into a Fuel cell battery to provide a constant source of power to a household.

The idea basically being that all the hydrogen for one day can be created quickly from the chemical reaction and then temporarily stored in holding containers reliving the necessity to permanently store hydrogen which is a major obstacle for a Hydrogen based economy.

If the demonstration system can confirm the suggested results from the preliminary modelling this would be a handy way to provide a constant source of energy to a household without having to worry about battery replacements every few years and could be built into every house

The hybrid device contains series of copper tubes coated with a thin layer of aluminum and aluminum oxide and partly filled with catalytic nanoparticles. A combination of water and methanol flows through the vacuum-sealed tubes.
“This set-up allows up to 95% of the sunlight to be absorbed with very little being lost as heat to the surroundings,” Hotz said. “This is crucial because it permits us to achieve temperatures of well over 200 ºC within the tubes. By comparison, a standard solar collector can only heat water between 60 and 7 ºC.”

Once the evaporated liquid achieves a high enough temperature, tiny amounts of a catalyst are added. The combination of high temperature and catalysts produces hydrogen very efficiently, Hotz said. The hydrogen can be immediately directed to a fuel cell to provide electricity to a building during the day, or compressed and stored in a tank to provide power later.