Photo of aqueous redox flow battery
CREDIT: Liwen Wang, South China University of Technology
To produce a cost-effective redox flow battery, researchers based at the South China University of Technology have synthesized a molecular compound that serves as a low-cost electrolyte, enabling a stable flow battery that retains 99.98% capacity per cycle. They published their approach on August 14 in the Energy Material Advances.
Comprising two tanks of opposing liquid electrolytes, the battery pumps the positive and negative liquids along a membrane separator sandwiched between electrodes, facilitating ion exchanges to produce energy. Significant work has been dedicated to developing the negative electrolyte liquid, while the positive electrolyte liquid has received less attention, according to corresponding author Zhenxing Liang, professor in the Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology.
“Aqueous redox flow batteries can realize the stable electrical output for using unsteady solar and wind energy, and they have been recognized as a promising large-scale energy storage technology,” Liang said. “Electroactive organic merit of element abundance, low cost and flexible molecular control over the electrochemical features for both positive and negative electrolytes are regarded as key to developing next-generation redox flow batteries.”
Liang and his team focused on TEMPO, a chemical compound with easily reversed oxidation states and high potential for energy, a desired quality in positive electrolytes.
“However, TEMPO cannot be directly applied to aqueous redox flow batteries due to the high hydrophobicity of the molecular skeleton,” Liang said, explaining that TEMPO, left unmodified, will not dissolve in the liquid needed to facilitate the energy exchange in the flow batteries. “We developed a strategy to functionalize TEMPO with viologen, an organic compound that has highly reversible redox reactions, to improve TEMPO’s hydrophilicity.”
According to Liang, viologen is highly soluble in water, which increases TEMPO’s ability to dissolve in water. Viologen also chemically withdraws electrons from atomic partners, which elevates its potential to change its oxidative state. Viologen is also a salt, which endows TEMPO with what Liang calls “a decent conductivity” in an aqueous solution.
When the synthesized viologen-modified TEMPO was tested in a flow battery, the researchers found that the battery retained capacity of 99.98% per cycle, meaning the battery could hold nearly all its stored energy when not in active use.
“This work overcomes the disadvantages of TEMPO by viologen-functionalization and realizes its application in aqueous redox flow battery,” Liang said. “The molecular design concept provides a strategy for novel organic electroactive materials and lays a foundation for the application of aqueous organic flow battery.”
More from: South China University of Technology
The Latest on: Redox flow battery
- All-Vanadium Redox Flow Batteries Market Size 2022, swot analysis,drivers , challenges, and their impact on growth and demand forecasts in 2026on July 3, 2022 at 10:24 pm
All-Vanadium Redox Flow Batteries Market Trend 2022, Analysis, growth, share, Status and Forecast 2026 ● Global ...
- Grid-Level Energy Storage And The Challenge Of Storing Energy Efficientlyon July 1, 2022 at 5:00 pm
For decades, reflow flow batteries have been developed as a possible solution. A redox (from reduction-oxidation) flow battery – or RFB – is a type of electrochemical battery that uses a ...
- Vanadium Miners News For The Month Of June 2022on June 30, 2022 at 6:06 am
Europe vanadium pentoxide spot prices were slightly lower the past 30 days. Click here to read more about vanadium miners news for June 2022.
- energy storageon June 29, 2022 at 5:00 pm
Researchers in Singapore have created a new kind of redox flow battery with an energy density around ten times higher than conventional redox flow batteries. Never heard of a redox flow battery?
- Salt and a battery: Smashing the limits of power storageon June 27, 2022 at 6:43 am
Thanks to the renewables boom, the limiting factor of the energy revolution is not power supply as much as power storage these days. Cleaner, greener batteries are needed to charge cars, ebikes and ...
- Redox Flow Battery Market Trends, Growth Rate, Consumption By Regional Data And Forecast 2022-2031on June 23, 2022 at 7:42 am
Shibuya-ku, Tokyo, Japan, Japan, Jun 23, 2022, 09:44 /Comserve / -- The report predicts the global Redox Flow Battery Market to grow at a healthy CAGR over the forecast period from 2022-2031.
- Bushveld upbeat about VRFB future as subsidiary secures funding for Vametco hybrid mini-gridon June 23, 2022 at 5:45 am
Integrated primary vanadium producer and energy storage solutions provider Bushveld Minerals has secured funding for the engineering, procurement and construction (EPC) of the R113-million Vametco ...
- The Pentagon awards Lockheed Martin a contract for a crucial system for energy storageon June 22, 2022 at 1:21 pm
Lockeed Martin has been chosen to provide the United State DoD's first megawatt-long-duration energy storage system.
- NUS GRIP Deep tech start-up, NEU Battery Materials raises S$800,000 in seed fundingon June 22, 2022 at 6:00 am
Company to commercialise world's first sustainable lithium iron phosphate battery recycling solution for truly clean lithium batteries SINGAPORE, June 22, 2022 /PRNewswire/ -- Deeptech start-up, NEU ...
- Harvard, Cambridge scientists improve durabiliy of redox flow batteries with anthraquinoneon June 21, 2022 at 11:15 pm
They said redox flow batteries developed via this approach could offer a net lifetime that is 17 times longer than previous research has shown. “Getting to a single-digit percentage of loss per ...
via Bing News
The Latest on: Redox flow battery
via Google News