News tagged with cathode
Return of the vacuum tube
Vacuum tubes have been retro for decades. They almost completely disappeared from the electronics scene when consumers exchanged their old cathode ray tube monitors for flat screen TVs. Their replacement – the semiconductor ...
May 18, 2012 |
5 / 5 (10) |
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Scientists make nontoxic, bendable nanosheets
(Phys.org) -- Cornell materials scientists have developed an inexpensive, environmentally friendly way of synthesizing oxide crystal sheets, just nanometers thick, which have useful properties for electronics ...
Nanotechnology / Nanomaterials
Apr 11, 2012 |
4.6 / 5 (7) |
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Battery cathode made of waste byproducts from paper industry promises sustainable energy storage
A breakthrough for inexpensive electricity from solar cells, and a massive investment in wind power, will mean a need to store energy in an intelligent way. According to research at Linköping University (Sweden), published ...
Mar 22, 2012 |
4.6 / 5 (7) |
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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) |
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Feud over iPad highlights faded tech firm's woes
The battle between an ailing Chinese electronics maker and Apple Inc. over the iPad name is just as much a tale of obsolescence in the fast-moving global technology industry as it is a legal row over a trademark.
Feb 27, 2012 |
3.7 / 5 (3) |
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Nanostructured electrodes for rechargeable sodium-Ion batteries
Highly efficient 3V cathodes for rechargeable sodium-ion batteries have been developed by users from Argonne National Laboratory's Materials Science, Chemical Sciences & Engineering, and X-ray Sciences Divisions, ...
Nanotechnology / Nanomaterials
Feb 13, 2012 |
4.5 / 5 (4) |
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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) |
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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) |
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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) |
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A systematic way to find battery materials
Lithium-ion batteries have become a leading energy source for everything from smartphones and laptops to power tools and electric cars, and researchers around the world are actively seeking ways to nudge their performance ...
Aug 12, 2011 |
5 / 5 (5) |
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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) |
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Progress in the development of rechargeable batteries through nanotechnology
Researchers are testing different ways of improving rechargeable batteries for electric vehicles and nanotechnology plays an important role in the development. The aim is to offer batteries that have fast ...
Nanotechnology / Nanomaterials
May 31, 2011 |
5 / 5 (1) |
3
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) |
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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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Platinum-coated nanoparticles could lead to better fuel cells
(PhysOrg.com) -- Fuel cells may power the cars of the future, but it's not enough to just make them work -- they have to be affordable. Cornell researchers have developed a novel way to synthesize a fuel cell ...
Nanotechnology / Nanomaterials
Dec 09, 2010 |
4 / 5 (7) |
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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.
