Will Graphene Replace Batteries?
An alternative to batteries gets an advance from tiny, crumpled sheets of graphene, whose electrodes can store more charge because they have larger surface areas.
Ultracapacitors, energy-storage devices that absorb and release charge in minutes, could be a rapid-charging, cheaper, and safer alternative to batteries for electric cars. But commercial ultracapacitors can hold just 5 percent of the energy of lithium-ion batteries, providing short power bursts that limit them to uses such as acceleration in hybrid buses. Researchers at Nanotek Instruments in Dayton, Ohio, have now made graphene electrodes that could lead to ultracapacitors with more than five times the energy density of commercial devices.
New research offers a tip for politicians who don’t want to be seen as corrupt: don’t get a big head.
These five main food groups are important for your brain's health and likely to boost the production of feel-good chemicals.
We all know eating “healthy” food is good for our physical health and can decrease our risk of developing diabetes, cancer, obesity and heart disease. What is not as well known is that eating healthy food is also good for our mental health and can decrease our risk of depression and anxiety.
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