Solar Energy
Green battery discovery turns trash into treasure
Green battery discovery turns trash into treasure
by Win Reynolds for Northwestern News
Evanston IL (SPX) Jan 10, 2025
The batteries used in our phones, devices and even cars rely on metals like lithium and cobalt, sourced through intensive and invasive mining. As more products begin to depend on battery-based energy storage systems, shifting away from metal-based solutions will be critical to facilitating the green energy transition.
Now, a team at Northwestern University has transformed an organic industrial waste product into an efficient storage agent for sustainable energy solutions that can one day be applied at much larger scales. This marks the first time a waste molecule – specifically, triphenylphosphine oxide (TPPO) – has been used to power a redox flow battery.
“Battery research has traditionally been dominated by engineers and materials scientists,” said Northwestern chemist and lead author Christian Malapit. “Synthetic chemists can contribute to the field by molecularly engineering an organic waste product into an energy-storing molecule. Our discovery showcases the potential of transforming waste compounds into valuable resources, offering a sustainable pathway for innovation in battery technology.”
Malapit is an assistant professor in the department of chemistry at Northwestern’s Weinberg College of Arts and Sciences.
What are redox flow batteries?
Unlike lithium and other solid-state batteries which store energy in electrodes, redox flow batteries use a chemical reaction to pump energy back and forth between electrolytes, where their energy is stored. Though not as efficient at energy storage, redox flow batteries are thought to be much better solutions for energy storage at a grid scale. A small part of the battery market at present, the market for redox flow batteries is expected to rise by 15% between 2023 and 2030 to reach a value of 700 million euros worldwide.
Power from a common waste product
Thousands of tons of TPPO are produced each year by many organic industrial synthesis processes – including the production of some vitamins, among other things – but it is rendered useless and must be carefully discarded following production.
According to the new research, published in the Journal of the American Chemical Society, a “one-pot” reaction allows chemists to turn TPPO into a usable product with powerful potential to store energy.
“Not only can an organic molecule be used, but it can also achieve high-energy density – getting closer to its metal-based competitors – along with high stability,” said Emily Mahoney, a Ph.D. candidate in the Malapit lab and the paper’s first author. “These two parameters are traditionally challenging to optimize together, so being able to show this for a molecule that is waste-derived is particularly exciting.”
To achieve both energy density and stability, the team needed to identify a strategy that allowed electrons to pack tightly together in the solution without losing storage capacity over time. They looked to the past and found a paper from 1968 describing the electrochemistry of phosphine oxides and, according to Mahoney, “ran with it.”
Then, to evaluate the molecule’s resilience as a potential energy-storage agent, the team ran tests using static electrochemical charge and discharge experiments similar to the process of charging a battery, using the battery, and then charging it again, over and over. After 350 cycles, the battery maintained remarkable health, losing negligible capacity over time.
What’s next
“This is the first instance of utilizing phosphine oxides – a functional group in organic chemistry – as the redox-active component in battery research,” Malapit said. “Traditionally, reduced phosphine oxides are highly unstable. Our molecular engineering approach addresses this instability, paving the way for their application in energy storage.”
In the meantime, the group hopes other researchers will pick up the charge and begin to work with TPPO to further optimize and improve its potential.
Research Report:Triphenylphosphine Oxide-Derived Anolyte for Application in Nonaqueous Redox Flow BatteryClick to copy article link
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Northwestern
Powering The World in the 21st Century at Energy-Daily.com
Solar Energy
Finding better photovoltaic materials faster with AI
Finding better photovoltaic materials faster with AI
by Robert Schreiber
Berlin, Germany (SPX) Jan 24, 2025
Researchers at the Karlsruhe Institute of Technology (KIT) and the Helmholtz Institute Erlangen-Nurnberg (HI ERN) have developed a novel AI-driven workflow that dramatically accelerates the discovery of high-efficiency materials for perovskite solar cells. By synthesizing and testing just 150 targeted molecules, the team achieved results that would typically require hundreds of thousands of experiments. “The workflow we have developed will open up new ways to quickly and economically discover high-performance materials for a wide range of applications,” said Professor Christoph Brabec of HI ERN. One of the newly identified materials enhanced the efficiency of a reference solar cell by approximately two percentage points, reaching 26.2 percent.
The research began with a database containing the structural formulas of about one million virtual molecules, each potentially synthesizable from commercially available compounds. From this pool, 13,000 molecules were randomly selected. KIT researchers applied advanced quantum mechanical methods to evaluate key properties such as energy levels, polarity, and molecular geometry.
Training AI with Data from 101 Molecules
Out of the 13,000 molecules, the team chose 101 with the most diverse properties for synthesis and testing at HI ERN’s robotic systems. These molecules were used to fabricate identical solar cells, enabling precise comparisons of their efficiency. “The ability to produce comparable samples through our highly automated synthesis platform was crucial to our strategy’s success,” Brabec explained.
The data obtained from these initial experiments were used to train an AI model. This model then identified 48 additional molecules for synthesis, focusing on those predicted to offer high efficiency or exhibit unique, unforeseen properties. “When the machine learning model is uncertain about a prediction, synthesizing and testing the molecule often leads to surprising results,” said Tenure-track Professor Pascal Friederich from KIT’s Institute of Nanotechnology.
The AI-guided workflow enabled the discovery of molecules capable of producing solar cells with above-average efficiencies, surpassing some of the most advanced materials currently in use. “We can’t be sure we’ve found the best molecule among a million, but we are certainly close to the optimum,” Friederich commented.
AI Versus Chemical Intuition
The researchers also gained valuable insights into the AI’s decision-making process. The AI identified chemical groups, such as amines, that are associated with high efficiency but had been overlooked by traditional chemical intuition. This capability underscores the potential of AI to uncover previously unrecognized opportunities in materials science.
The team believes their AI-driven strategy can be adapted for a wide range of applications beyond perovskite solar cells, including the optimization of entire device components. Their findings were achieved in collaboration with scientists from FAU Erlangen-Nurnberg, South Korea’s Ulsan National Institute of Science, and China’s Xiamen University and University of Electronic Science and Technology. The research was published in the journal Science.
Research Report:Inverse design of molecular hole-transporting semiconductors tailored for perovskite solar cells
Related Links
Karlsruhe Institute of Technology
All About Solar Energy at SolarDaily.com
Solar Energy
Scale-up fabrication of perovskite quantum dots
Scale-up fabrication of perovskite quantum dots
by Simon Mansfield
Sydney, Australia (SPX) Jan 24, 2025
Quantum dots, tiny semiconductor nanomaterials known for their color-tunable and highly efficient photoluminescence, have revolutionized display technologies such as liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs), and micro light-emitting diodes (Micro-LEDs). In 2023, the Nobel Prize in Chemistry recognized the discovery and development of quantum dots, underscoring their significance in modern technology.
Perovskite quantum dots (PQDs) are a promising class of materials distinguished by their high absorption coefficient, cost-effectiveness, ease of processing, and reduced environmental impact. Their potential for display applications has attracted considerable interest. In 2015, Professor Zhong and his team introduced a groundbreaking method for in-situ fabrication of PQDs within a polymeric matrix. The subsequent establishment of Zhijing Technology (Beijing) Co., Ltd. in 2016 aimed to advance the scale-up production and application of PQDs in display technologies.
After extensive efforts, the company has developed several in-situ fabrication techniques to enable large-scale manufacturing. These methods include in-situ blade coating, spray drying, extrusion, inkjet printing, and lithography. Recently, the team resolved PQD stability challenges, leading to the integration of PQDs in Skyworth’s TV products. Unlike conventional quantum-dot light-emitting diode (QLED) TVs that utilize 630 nm emissive materials, these innovations introduced deep-red emissive PQDs at 650 nm, enhancing eye care capabilities.
In January 2025, the journal Engineering published a research article titled “Spray-Drying Fabrication of Perovskite Quantum-Dot-Embedded Polymer Microspheres for Display Applications.” This study highlighted the successful scale-up fabrication of PQDs, achieving a production capacity of 2000 kilograms annually. The research also demonstrated the use of PQDs in LCD backlight applications, where PQD-based optical films exhibited exceptional stability under challenging conditions. Aging tests showed brightness decay within 10% after 1000 hours at 60 C with 90% relative humidity and under 70 C conditions with 150 W/m2 455 nm blue light irradiation.
Furthermore, researchers showcased PQD-embedded polymer microspheres as efficient color converters in full-color Micro-LED displays with pixel sizes as small as 10 um. The spray-drying fabrication method provides a cost-effective solution for large-scale PQD production. These PQD-embedded polymer microspheres demonstrated remarkable long-term operational stability, making them highly competitive for use in advanced display technologies.
Research Report:Spray-Drying Fabrication of Perovskite Quantum-Dot-Embedded Polymer Microspheres for Display Applications
Related Links
Beijing Institute of Technology
All About Solar Energy at SolarDaily.com
Solar Energy
Solar power surpasses coal in EU for first time
Solar power surpasses coal in EU for first time
by AFP Staff Writers
Paris (AFP) Jan 23, 2025
Solar overtook coal in the European Union’s electricity production in 2024, with the share of renewables rising to almost half the bloc’s power sector, according to a report released Thursday.
Gas generation, meanwhile, declined for the fifth year in a row and fossil-fuelled power dipped to a “historic low”, climate think tank Ember said in its European Electricity Review 2025.
“The European Green Deal has delivered a deep and rapid transformation of the EU power sector,” the think tank said.
“Solar remained the EU’s fastest-growing power source in 2024, rising above coal for the first time. Wind power remained the EU’s second-largest power source, above gas and below nuclear.”
Overall, strong growth in solar and wind have boosted the share of renewables to 47 percent, up from 34 percent in 2019.
Fossil fuels have fallen from 39 to 29 percent.
“A surge in wind and solar generation is the main reason for declining fossil generation. Without wind and solar capacity added since 2019, the EU would have imported 92 billion cubic metres more of fossil gas and 55 million tonnes more of hard coal, costing EUR59 billion,” the report said.
According to Ember, these trends are widespread across Europe, with solar power progressing in all EU countries.
More than half have now either eliminated coal, the most polluting fossil fuel, or reduced its share to less than five percent of their energy mix.
“Fossil fuels are losing their grip on EU energy,” said Chris Rosslowe, lead author of the report.
“At the start of the European Green Deal in 2019, few thought the EU’s energy transition would be where it is today: wind and solar are relegating coal to the margins and pushing gas into decline.”
– Battery storage –
But Rosslowe cautioned much work remains.
“We need to accelerate our efforts, particularly in the wind power sector,” he said.
Europe’s electricity system will also need to increase its storage capacity to make the most of renewable energies, which are by definition intermittent, he added.
In 2024, plentiful solar energy helped drive down prices in the middle of the day, sometimes even resulting in “negative or zero price hours” due to an overabundance of supply compared to demand.
“A readily available solution is a battery co-located with a solar plant. This gives solar power producers more control over the prices they receive and helps them avoid selling for low prices in the middle of the day,” the report said.
The think tank suggested consumers could reduce their bills by shifting usage to periods of abundance (smart electrification), while battery operators could earn revenue from buying power when prices are low and selling it back when demand peaks.
Batteries have advanced significantly in recent years, with installed capacity across the EU doubling to 16 GW in 2023, compared with 8 GW in 2022, according to Ember.
But this capacity is concentrated in just a small number of countries: 70 percent of existing batteries were located in Germany and Italy at the end of 2023.
“More storage and demand flexibility is needed to sustain growth and for consumers to reap the full benefits of abundant solar,” Ember said.
“After a challenging few years for the wind power sector, additions are set to grow, but not by enough to hit EU targets. Closing this gap will require continued policy implementation and political support, such that the rate of additions between now and 2030 is more than double that of recent years.”
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