News tagged with cathode
Lithium-ion battery with new chemistry could power electric vehicles
(PhysOrg.com) -- While car companies race to develop electric and hybrid electric vehicles, one of the biggest challenges they face is finding a suitable energy storage system. Lithium-ion batteries, which ...
Feb 21, 2011 |
4.6 / 5 (32) |
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Nanoball Batteries Could Charge Electric Cars in 5 Minutes
(PhysOrg.com) -- Researchers at MIT have designed a new battery that can recharge devices about 100 times faster than conventional lithium ion batteries. The design could lead to electric car batteries that ...
Nanotechnology / Nanomaterials
Mar 12, 2009 |
4.8 / 5 (28) |
10
Rechargeable lithium-sulfur batteries get a boost from graphene
(PhysOrg.com) -- By wrapping tiny sulfur particles in graphene sheets, researchers from Stanford University have synthesized a promising cathode material for rechargeable lithium-sulfur batteries that could ...
Nanotechnology / Nanomaterials
Jul 13, 2011 |
4.2 / 5 (22) |
53
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Liquid-OLED Offers More Light-Emitting Possibilities
(PhysOrg.com) -- As organic light-emitting diodes (OLEDs) are poised to go mainstream in the near future, scientists continue to explore new twists on the technology. Recently, researchers have fabricated ...
Aug 14, 2009 |
4.8 / 5 (18) |
1
New technology improves both energy capacity and charge rate in rechargeable batteries
Imagine a cellphone battery that stayed charged for more than a week and recharged in just 15 minutes. That dream battery could be closer to reality thanks to Northwestern University research.
Nov 14, 2011 |
4.8 / 5 (18) |
17
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Company Claims ESLs to be the Future of Light Bulbs (w/ Video)
(PhysOrg.com) -- While compact fluorescent lights (CFLs) are currently the primary alternative to incandescent light bulbs, a company from Seattle predicts that its own novel light bulbs will eventually replace ...
Technology / Hi Tech & Innovation
Sep 16, 2009 |
3.5 / 5 (24) |
22
A new generation of power: Hi-tech rechargeable batteries developed for military
Scientists reported progress today in using a common virus to develop improved materials for high-performance, rechargeable lithium-ion batteries that could be woven into clothing to power portable electronic ...
Technology / Energy & Green Tech
Aug 23, 2010 |
3.4 / 5 (24) |
12
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Chinese team develop fuel cell that can clean water as it generates electricity
(PhysOrg.com) -- Yanbiao Liu and his colleagues from Shanghai Jiao Tong University, have succeeded in building a device capable of both cleaning wastewater and producing electricity from it. Using light as ...
Aug 19, 2011 |
4.9 / 5 (16) |
6
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Say hello to cheaper hydrogen fuel cells: Scientists document utility of non-precious-metal catalysts
(PhysOrg.com) -- Los Alamos National Laboratory scientists have developed a way to avoid the use of expensive platinum in hydrogen fuel cells, the environmentally friendly devices that might replace current ...
Apr 21, 2011 |
4.7 / 5 (15) |
5
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Sulfur in hollow nanofibers overcomes challenges of lithium-ion battery design
(PhysOrg.com) -- Stanford researchers have used nanotechnology to invent a better lithium ion battery cathode.
Nanotechnology / Nanomaterials
Oct 05, 2011 |
5 / 5 (14) |
8
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Printable batteries
For a long time, batteries were bulky and heavy. Now, a new cutting-edge battery is revolutionizing the field. It is thinner than a millimeter, lighter than a gram, and can be produced cost-effectively through ...
Jul 02, 2009 |
4.8 / 5 (13) |
4
Chemists report promising advance in fuel-cell technology
Creating catalysts that can operate efficiently and last a long time is a big barrier to taking fuel-cell technology from the lab bench to the assembly line. The precious metal platinum has been the choice ...
May 24, 2010 |
4.6 / 5 (13) |
0
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Renewable hydrogen production becomes reality at winery
(PhysOrg.com) -- The first demonstration of a renewable method for hydrogen production from wastewater using a microbial electrolysis system is underway at the Napa Wine Company in Oakville. The refrigerator-sized hydrogen ...
Technology / Energy & Green Tech
Sep 29, 2009 |
4.3 / 5 (13) |
0
Cyborg snail produces electricity
(PhysOrg.com) -- First it was grapes, then cockroaches, and now snails have become the latest organism to generate electricity through an implanted biofuel cell. The process works similarly in all three situations: ...
Mar 15, 2012 |
4.2 / 5 (13) |
6
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Working toward the next battery breakthrough (w/ Video)
If battery-making is an art, then University at Buffalo scientist Esther Takeuchi is among its most prolific masters, with more than 140 U.S. patents, all in energy storage.
Technology / Energy & Green Tech
Jun 07, 2010 |
4.2 / 5 (12) |
1
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Cathode
A cathode is an electrode through which electric current flows out of a polarized electrical device. Mnemonic: CCD (Cathode Current Departs).
Cathode polarity is not always negative. Although positively charged cations always move towards the cathode (hence their name) and/or negatively charged anions move away from it, cathode polarity depends on the device type, and can even vary according to the operating mode. In a device which consumes power, the cathode is negative, and in a device which provides power, the cathode is positive:
An electrode through which current flows the other way (into the device) is termed an anode.
For more information about Cathode, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
