Graphene for energy use is emerging as an exciting topic of research, with breakthrough discoveries hitting the headlines every week.
Supercapacitors, the new paradigm for portable energy, are expected to replace traditional batteries in personal devices such as cellphones, laptop computers, tablets, and even electric vehicles. Supercapacitors can recharge and discharge in just seconds, but can hold enough energy to power a handheld device for several weeks. With supercapacitors, even electric cars could be charged at “electric stations” within a few minutes, with enough “gas” to drive around the whole day. Graphene supercapacitors have existed in research labs for only two years, but the progress has been tremendous.
The recently developed process to make graphene supercapacitors, which is economical and industrially scalable, starts from the widely available graphene oxide. Although the aforementioned development is awesome, a most recent one is a serious competitor in the world of graphene supercapacitors. The recent work radically departs from all known supercapacitors, by using technology’s favorite material – silicon – as the active energy-storing material.
Instead of storing energy in chemical reactions the way batteries do, “supercaps” store electricity by assembling ions on the surface of a porous material. The problem with the concept of using silicon as the porous material for supercaps is that silicon tends to react with chemicals which form the electrolyte, a chief component of any modern energy-storing device.
The novel device, developed at Vanderbilt University, takes care of the silicon reactivity problem by coating the silicon with a layer of graphene. The graphene layer, only several nanometers thin, passivates the porous silicon surface, preventing any reaction with the electrolyte. The graphene smoothly follows the structure of the pores in silicon. The silicon-graphene composite acts as the electrode of the supercap, resulting in large improvements in energy density compared to bare silicon. Taking into account the ubiquity of silicon, this new approach provides an exciting platform for grid-scale as well as integrated (portable) energy storage.
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- Australian startup H2X plans new hydrogen fuel cell vehicleson June 16, 2020 at 12:32 am
and significant burst power and high-efficiency regenerative braking are possible thanks to a Skeleton Tech graphene ultracapacitor. H2X says it'll have adaptive cruise, auto emergency braking ...
- graphene capacitorson June 12, 2020 at 5:00 pm
I don’t think anyone thought the first graphene capacitors would be available through Kickstarter, though. I’m a little torn on this one. On one hand, graphene supercaps, now. On the other ...
- Ask Hackaday: Graphene Capacitors On Kickstarteron June 1, 2020 at 5:00 pm
I will admit I am skeptical of this Kickstarter. Apparently, these graphene supercaps are in part designed and manufactured by [Shawn] himself. He fabricates the graphene by putting graphite ...
- Russian scientists amp up battery power by finding out how to double capacityon December 13, 2017 at 1:55 am
TASS/. Researchers from the Siberian Federal ... To do so, they came up with the idea to use graphene and vanadium disulfide as an anode. The discovery is described in an article published ...
- Can supercapacitor ‘wafers’ make power cords obsolete?on May 22, 2014 at 6:39 am
As a result, supercaps can charge and discharge in minutes ... inner surfaces and then coated with a protective ultrathin graphene-like layer of carbon. Sandwiched between the two electrodes ...
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- A Simply Fabricated and Eco-Friendly Supercapacitor for “Greener” Wearableson June 26, 2020 at 10:44 am
Researchers have created a high performance, eco-friendly, and elastic supercapacitor that could be a boon for the development of greener wearables.
- Electrolyte gating in graphene-based supercapacitors and its use for probing nanoconfined charging dynamicson June 22, 2020 at 8:23 am
The electronic conductivity of graphene-based porous electrodes can be modulated by their ionic charging state in supercapacitors, enabling a new in operando technique to probe the charging dynamics ...
- Laser Etching Graphene Supercapacitorson June 21, 2020 at 5:01 pm
you can literally print patterns of graphene using the laser in your DVD burner. By making the shapes shown above, you can introduce an electrolyte and turn the whole thing into a supercapacitor.
- Newfound Lightweight Supercapacitor Materials Help Extend Battery Life for Mobile Electronic Deviceson June 19, 2020 at 7:03 pm
Haleh Ardebili from the University of Houston led a team to develop a new electrode based on reduced graphene oxide and aramid nanofiber ... are on the way for energy-hungry electronic systems.
- At 20.50% CAGR, Supercapacitors Market Size to Surpass USD 3029.92 Million by 2026on June 18, 2020 at 2:16 am
The supercapacitors market is expected to benefit from technological advances such as the use of graphene and carbon nanotubes in these products. These substances are increasingly being used in ...