Sunlight makes the new “aqueous solar flow” battery 20 percent more efficient than today’s lithium-iodine batteries
After debuting the world’s first solar air battery last fall, researchers at The Ohio State University have now reached a new milestone.
Photo by Kevin Fitzsimons, courtesy of The Ohio State University.
Prototype aqueous solar flow battery under development at The Ohio State University. The square piece of solar cell (center) is red, because the researchers are using a red dye to tune the wavelength of light it absorbs and converts to electrons.
In the Journal of the American Chemical Society, they report that their patent-pending design—which combines a solar cell and a battery into a single device—now achieves a 20 percent energy savings over traditional lithium-iodine batteries.
The 20 percent comes from sunlight, which is captured by a unique solar panel on top of the battery, explained Yiying Wu, professor of chemistry and biochemistry at Ohio State.
The solar panel is now a solid sheet, rather than a mesh as in the previous design. Another key difference comes from the use of a water-based electrolyte inside the battery.
Because water circulates inside it, the new design belongs to an emerging class of batteries called aqueous flow batteries.
“The truly important innovation here is that we’ve successfully demonstrated aqueous flow inside our solar battery,” Wu said.
As such, it is the first aqueous flow battery with solar capability. Or, as Wu and his team have dubbed it, the first “aqueous solar flow battery.”
“It’s also totally compatible with current battery technology, very easy to integrate with existing technology, environmentally friendly and easy to maintain,” he added.
Researchers around the world are working to develop aqueous flow batteries because they could theoretically provide affordable power grid-level energy storage someday.
The solar flow battery could thus bridge a gap between today’s energy grid and sources of renewable energy.
"This solar flow battery design can potentially be applied for grid-scale solar energy conversion and storage, as well as producing ‘electrolyte fuels’ that might be used to power future electric vehicles,” said Mingzhe Yu, lead author of the paper and a doctoral student at Ohio State.
Previously, Yu designed the solar panel out of titanium mesh, so that air could pass through to the battery. But the new aqueous flow battery doesn’t need air to function, so the solar panel is now a solid sheet.
The solar panel is called a dye-sensitized solar cell, because the researchers use a red dye to tune the wavelength of light it captures and converts to electrons. Those electrons then supplement the voltage stored in the lithium-anode portion of the solar battery.
Something has to carry electrons from the solar cell into the battery, however, and that’s where the electrolyte comes in. A liquid electrolyte is typically part salt, part solvent; previously, the researchers used the salt lithium perchlorate mixed with the organic solvent dimethyl sulfoxide. Now they are using lithium iodide as the salt, and water as the solvent. (Water is an inorganic solvent, and an eco-friendly one. And lithium iodide offers a high-energy storage capacity with low cost.)
In tests, the researchers compared the solar flow battery’s performance to that of a typical lithium-iodine battery. They charged and discharged the batteries 25 times. Each time, both batteries discharged around 3.3 volts.
The difference was that the solar flow battery could produce the same output with less charging. The typical battery had to be charged to 3.6 volts to discharge 3.3 volts. The solar flow battery was charged to only 2.9 volts, because the solar panel made up the difference. That’s an energy savings of nearly 20 percent.
The project is still ongoing, and the solar flow design will undoubtedly evolve again as the researchers try to make the battery more efficient.
Doctoral student and study co-author Billy McCulloch said that there are many different directions the research could take.
“We hope to motivate the research community to further develop this technology into a practical renewable energy solution,” he added.
The team’s ultimate goal is to boost the solar cell’s contribution to the battery past its current 20 percent—maybe even to 100 percent.
“That’s our next step,” Wu said, “to really achieve a fully solar-chargeable battery.”
Other coauthors on the paper included doctoral students Damian R. Beauchamp, Zhongjie Huang and Xiaodi Ren.
This research was funded by the Department of Energy.
Yiying Wu, (614) 247-7810; Wu.email@example.com [Wu is currently on sabbatical at Argonne National Laboratory and is best reached by email.]
Written by Pam Frost Gorder, (614) 292-9475; Gorder.firstname.lastname@example.org
Pamela Gorder | newswise
Lade-PV Project Begins: Vehicle-integrated PV for Electrical Commercial Vehicles
03.04.2020 | Fraunhofer-Institut für Solare Energiesysteme ISE
Harnessing the rain for hydrovoltaics
03.04.2020 | Max-Planck-Institut für Polymerforschung
Drops of water falling on or sliding over surfaces may leave behind traces of electrical charge, causing the drops to charge themselves. Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz have now begun a detailed investigation into this phenomenon that accompanies us in every-day life. They developed a method to quantify the charge generation and additionally created a theoretical model to aid understanding. According to the scientists, the observed effect could be a source of generated power and an important building block for understanding frictional electricity.
Water drops sliding over non-conducting surfaces can be found everywhere in our lives: From the dripping of a coffee machine, to a rinse in the shower, to an...
90 million-year-old forest soil provides unexpected evidence for exceptionally warm climate near the South Pole in the Cretaceous
An international team of researchers led by geoscientists from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have now...
The bacteria that cause tuberculosis need iron to survive. Researchers at the University of Zurich have now solved the first detailed structure of the transport protein responsible for the iron supply. When the iron transport into the bacteria is inhibited, the pathogen can no longer grow. This opens novel ways to develop targeted tuberculosis drugs.
One of the most devastating pathogens that lives inside human cells is Mycobacterium tuberculosis, the bacillus that causes tuberculosis. According to the...
An international team with the participation of Prof. Dr. Michael Kues from the Cluster of Excellence PhoenixD at Leibniz University Hannover has developed a new method for generating quantum-entangled photons in a spectral range of light that was previously inaccessible. The discovery can make the encryption of satellite-based communications much more secure in the future.
A 15-member research team from the UK, Germany and Japan has developed a new method for generating and detecting quantum-entangled photons at a wavelength of...
Together with their colleagues from the University of Würzburg, physicists from the group of Professor Alexander Szameit at the University of Rostock have devised a “funnel” for photons. Their discovery was recently published in the renowned journal Science and holds great promise for novel ultra-sensitive detectors as well as innovative applications in telecommunications and information processing.
The quantum-optical properties of light and its interaction with matter has fascinated the Rostock professor Alexander Szameit since College.
02.04.2020 | Event News
26.03.2020 | Event News
23.03.2020 | Event News
03.04.2020 | Materials Sciences
03.04.2020 | Life Sciences
03.04.2020 | Life Sciences