Stories tagged storage

Splitting water to store electricity: A snapshot showing the new, efficient oxygen catalyst in action in Dan Nocera's laboratory at MIT.
Courtesy MIT/NSF

Saving up energy for use at night

Want to be energy independent? Solar and wind energy are great but what do you do when the sun goes down and the wind doesn't blow? Batteries with the needed capacity are very expensive.

Energy can be saved up by breaking water apart into hydrogen and oxygen

Using a surprisingly simple, inexpensive technique, chemists have found a way to pull pure oxygen from water using relatively small amounts of electricity, common chemicals and a room-temperature glass of water. At night that oxygen can be combined with hydrogen (also extracted from water) in a fuel cell to make electricity.
The new process, enabling water to more easily be split, is to use a catalyst consisting of cobalt metal, phosphate and an electrode, placed in water.

"When electricity -- whether from a photovoltaic cell, a wind turbine or any other source -- runs through the electrode, the cobalt and phosphate form a thin film on the electrode, and oxygen gas is produced."
"The new catalyst works at room temperature, in neutral pH water, and it's easy to set up. That's why I know this is going to work. It's so easy to implement," Danial Nocera (MIT news office)

Within ten years

Nocera hopes that within 10 years, homeowners will be able to power their homes in daylight through photovoltaic cells, while using excess solar energy to produce hydrogen and oxygen to power their own household fuel cell. Electric vehicles will also power up from this home system.

Learn more: MIT News

Tags : energy, Chesonis Family Foundation, storage, Daniel Nocera, MIT Energy Initiative, electrolysis, catalyst, MIT, NSF, solar, wind

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Batteries recalled

Ultracapacitors to replace batteriesBatteries start fires. Batteries pollute. Batteries wear out. Batteries can leak acid. What the world needs is a better way to store electic energy. The people who invested in Google, Amazon, and AOL are now putting their money in ultracapacitors.

New ultracapacitors can replace batteries

If a new company called EEStor delivers on its promises, storing electric power in what it calls ultracapacitors will change the world.

Among EEStor's claims is that its "electrical energy storage unit" (EESU) could pack nearly 10 times the energy punch of a lead-acid battery of similar weight and, under mass production, would cost half as much.
It also says its technology more than doubles the energy density of lithium-ion batteries in most portable computer and mobile gadgets today, but could be produced at one-eighth the cost. TreeHugger

EEStore has contracted to deliver its first EESUs to ZENN Motor Company in 2007 to use in their electric vehicles. It also has patented "Electrical-energy-storage unit (EESU) utilizing ceramic and integrated-circuit technologies for replacement of electrochemical batteries."

What is an ultracapacitor and how does it work?

According to Clean Break via The Energy Blog

• It is a parallel plate capacitor with barium titanate as the dielectric.
• It claims that it can make a battery at half the cost per kilowatt-hour and one-tenth the weight of lead-acid batteries.
• As of last year selling price would start at $3,200 and fall to $2,100 in high-volume production
• The product weighs 400 pounds and delivers 52 kilowatt-hours.
• The batteries fully charge in minutes as opposed to hours.
• The EEStor technology has been tested up to a million cycles with no material degradation compared to lead acid batteries that optimistically have 500 to 700 recharge cycles,
• Because it's a solid state battery rather than a chemical battery, such being the case for lithium ion technology, there would be no overheating and thus safety concerns with using it in a vehicle.

A capacitor is like a grilled cheese sandwich. The electrical energy is stored in the bread slices. The cheese needs to prevent the stored electricity from leaking across to the other side. In ultracapacitors the pressure will be over a thousand volts. The company that can solve ultracapacitor size, weight, leakage, cost, and safety issues will have the "holy grail" of electric storage.

Tags : energy, batteries, storage, ultracapacitors, capacitors, eestor, zenn, electric vehicles

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