Inexpensive catalyst that makes hydrogen gas 10 times faster than natural enzyme
The part of the catalyst that cranks out 100,000 molecules of hydrogen gas a second packs electrons into chemical bonds between hydrogen atoms, possibly hijacked from water. Credit: PNNL
Looking to nature for their muse, researchers have used a common protein to guide the design of a material that can make energy-storing hydrogen gas. The synthetic material works 10 times faster than the original protein found in water-dwelling microbes, the researchers report in the August 12 issue of the journal Science , clocking in at 100,000 molecules of hydrogen gas every second.
This step is just one part of a series of reactions to split water and make hydrogen gas, but the researchers say the result shows they can learn from nature how to control those reactions to make durable synthetic catalysts for energy storage , such as in fuel cells.
In addition, the natural protein , an enzyme, uses inexpensive, abundant metals in its design, which the team copied. Currently, these materials -- called catalysts, because they spur reactions along -- rely on expensive metals such as platinum.
"This nickel-based catalyst is really very fast," said coauthor Morris Bullock of the Department of Energy's Pacific Northwest National Laboratory. "It's about a hundred times faster than the previous catalyst record holder. And from nature, we knew it could be done with abundant and inexpensive nickel or iron."
Stuffing Bonds
Electrical energy is nothing more than electrons. These same electrons are what tie atoms together when they are chemically bound to each other in molecules such as hydrogen gas. Stuffing electrons into chemical bonds is one way to store electrical energy , which is particularly important for renewable, sustainable energy sources like solar or wind power. Converting the chemical bonds back into flowing electricity when the sun isn't shining or the wind isn't blowing allows the use of the stored energy, such as in a fuel cell that runs on hydrogen.
Electrons are often stored in batteries, but Bullock and his colleagues want to take advantage of the closer packing available in chemicals.
"We want to store energy as densely as possible. Chemical bonds can store a huge amount of energy in a small amount of physical space," said Bullock, director of the Center for Molecular Electrocatalysis at PNNL, one of DOE's Energy Frontier Research Centers. The team also included visiting researcher Monte Helm from Fort Lewis College in Durango, Colo.
How Does A Relay Work - News
With that plan in mind, the team built potential catalysts and tested them. On their first try, they put a bunch of pendant amines around the nickel center, thinking more would be better. Testing their catalyst, they found it didn't work very fast.
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Relays Power Saver Circuit | Electronic Circuit Diagram
Relays are usually worked at current level where it can initiate the mechanical metal contactors movement. The current level needed to keep the conductor plates stay attached is actually smaller than the current to initiate it after contacts has been established. This power saver circuit like to have opposite mechanism of durge protector. Surge current to initiate mechanical movement is provided by this circuit, but after that, this circuit throttle the current to save the power, provide lower current level just to keep the contacts stay attached. Check the circuit diagram below. How does this circuit work is similar with the surge protector but in the opposite way. This circuit uses positive coefficient, where the resistance increases as the temperature does. This kind of varistor is actually an incandescent bulbs, two bulbs in parallel. This bulbs has very low resistance at cold temperature. This make sure the relay will has sufficient power supply to initiate the mechanical movement of its contactors. The rise of bulbs temperature will make the current decreased to a lower level after the relay works, saving the power while maintaining the contactors stay attached. That’s how the power saver circuit works.
How Does A Relay Work - Bookshelf
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HowStuffWorks "How Relays Work"
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