Graphene and metal nitrides improve the performance and stability of energy storage devices
Supercapacitors can be charged and discharged tens of thousands of times, but their relatively low energy density compared to conventional batteries limits their application for energy storage. Now, A*STAR researchers have developed an ‘asymmetric’ supercapacitor based on metal nitrides and graphene that could be a viable energy storage solution.
A supercapacitor’s viability is largely determined by the materials of which its anodes and cathodes are comprised. These electrodes must have a high surface area per unit weight, high electrical conductivity and capacitance and be physically robust so they do not degrade during operation in liquid or hostile environments.
Unlike traditional supercapacitors, which use the same material for both electrodes, the anode and cathode in an asymmetric supercapacitor are made up of different materials. Scientists initially used metal oxides as asymmetric supercapacitor electrodes, but, as metal oxides do not have particularly high electrical conductivities and become unstable over long operating cycles, it was clear that a better alternative was needed.
Metal nitrides such as titanium nitride, which offer both high conductivity and capacitance, are a promising alternative, but they tend to oxidize in watery environments that limits their lifetime as an electrode. A solution to this is to combine them with more stable materials.
Hui Huang from A*STAR’s Singapore Institute of Manufacturing Technology and his colleagues from Nanyang Technological University and Jinan University, China, have fabricated asymmetric supercapacitors which incorporate metal nitride electrodes with stacked sheets of graphene.
To get the maximum benefit from the graphene surface, the team used a precise method for creating thin-films, a process known as atomic layer deposition, to grow two different materials on vertically aligned graphene nanosheets: titanium nitride for their supercapacitor’s cathode and iron nitride for the anode. The cathode and anode were then heated to 800 and 600 degrees Celsius respectively, and allowed to slowly cool. The two electrodes were then separated in the asymmetric supercapacitor by a solid-state electrolyte, which prevented the oxidization of the metal nitrides.
The researchers tested their supercapacitor devices and showed they could cycle 20,000 times and exhibited both high capacitance and high power density.
Read more: Graphene’s stabling influence
The Latest on: Energy storage
via Google News
The Latest on: Energy storage
- Vistra brings Texas’ largest battery energy storage system onlineon May 23, 2022 at 11:42 am
DeCordova is the second of seven new zero-carbon projects Vistra is bringing online in Texas over the next few years as part of its growing Vistra Zero portfolio. These new power generation facilities ...
- Piston Group to manufacture EV batteries for startup Our Next Energyon May 23, 2022 at 11:00 am
Piston Group said it plans to produce ONE's Aries battery packs, which utilize lithium iron phosphate chemistry to "increase range and reduce cost while eliminating nickel and cobalt supply chain and ...
- Schneider Electric Optimizes Distributed Energy Resources (DER) Management with Grid to Prosumer End-to-End Approachon May 23, 2022 at 10:44 am
Grid to Prosumer combines the 3 pillars of DER management: grid optimization, flexibility services, prosumer engagement BOSTON, MA - May 23 rd, 2022 - Schneider Electric, the global leader in the ...
- Vistra Energy Storage Facility Online, Releasing Electricity to Texas Gridon May 23, 2022 at 10:36 am
By Denny Jacob Vistra Corp. said Monday that an energy storage facility in Granbury, Texas, is online, storing and releasing electricity to the ...
- UFO Battery Offers the Right Power Storage Optionson May 23, 2022 at 10:22 am
Shenzhen, Guangdong Province, China - 23 May, 2022 - UFO Battery is a power storage brick manufacturer that offers Solar Energy storage solutions. We do live in a wonderful time w ...
- Piston Automotive and Our Next Energy Partner to Manufacture EV Batterieson May 23, 2022 at 9:48 am
Piston Automotive in Southfield has announced a partnership with Novi's Our Next Energy to manufacture EV batteries in Van Buren Township.
- Reducing water usage in concentrated solar power plants with radiative cooling and cold storageon May 23, 2022 at 9:33 am
To deal with the current climate and energy crisis, the world is moving towards a sustainable energy economy. Concentrated solar power (CSP) plants are becoming a major player in this field. CSP ...
- Residential Solar Energy Storage Market Involved Key Players Will Create New Level Of Revenue Stream In The Upcoming Years 2022 – 2028on May 19, 2022 at 5:22 am
A thorough analysis of statistics about the current as well as emerging trends offers clarity regarding the Residential Solar Energy Stora ...
- Will energy storage live up to the hype?on May 19, 2022 at 5:00 am
Deploying more renewable energy and energy storage in our communities are two ways we can increase the antifragility of the grid. During the first two years of his presidency, Joe Biden has made it ...
- More energy storage is needed to support wind and solar power, MIT study findson May 16, 2022 at 3:38 pm
The authors of the report estimated that the costs of transforming power grids in the Northeast, Southeast, and Texas will range between 21 percent and 36 percent higher than if nothing was done to ...
via Bing News