Scientists at Northwestern University have developed a remarkable new material that can capture energy, store it for months, use it when needed, and then reset itself for reuse.
Even more surprisingly, it behaves in a way that resembles living cells.
The new material could one day help store renewable energy, power chemical reactions, clean up pollutants, and support future electronic devices.
Unlike traditional batteries, it works entirely in water and does not require metals or plastics.
The research, published in the journal Chem, describes the first known material that stores energy by physically changing its structure and then rebuilding itself.
The inspiration came from biology. Inside living cells is a network called the cytoskeleton, which helps cells maintain their shape, move, and divide. Unlike the rigid skeletons found in animals, the cytoskeleton is constantly assembling, breaking apart, and rebuilding itself.
The new material behaves in a similar way. It repeatedly assembles and disassembles as it stores and releases energy.
The material starts as a yellow liquid. When it absorbs energy from sunlight, electricity, X-rays, or certain chemical sources, it undergoes a dramatic transformation. The liquid turns into a black gel that can store energy for long periods of time. Researchers say the stored energy can remain available for months.
When the energy is needed, it can be released to drive chemical reactions, much like a battery supplying electricity. Afterward, the material can be reset simply by exposing it to oxygen in the air. The oxygen causes the black gel to dissolve back into its original yellow liquid form, ready to be charged again.
One of the biggest advantages of the new material is that it combines three functions in a single system. Normally, collecting energy, storing it, and using it require separate technologies. For example, solar panels collect energy while batteries store it. This new material performs all three tasks on its own.
The secret lies in specially designed molecules that organize themselves into larger structures. When the molecules absorb energy, they transfer electrons between different parts of the molecule. This process causes neighboring molecules to attract one another and form tiny ribbon-like structures.
As more ribbons form and intertwine, they create a conductive black gel that stores energy throughout its molecular network. The gel acts like a rechargeable energy reservoir.
In laboratory experiments, the researchers showed that the charged gel could release its stored energy even in complete darkness. This allowed it to drive chemical reactions without any ongoing light source, a capability the team calls “dark photocatalysis.”
This feature could be especially useful because most light-powered materials stop working as soon as the light is removed.
The material also offers exciting possibilities for electronics. Since light can selectively trigger the transformation, researchers can create tiny conductive patterns that later disappear when the material resets.
The team believes the technology could eventually find applications in renewable energy storage, environmental cleanup, adaptive electronics, and smart materials. According to the researchers, just one gram of the material could potentially store enough energy to power a smartwatch or similar wearable device.
While more development is needed before commercial use, the invention offers a glimpse of a future where clean, reusable, water-based materials help store and manage renewable energy more efficiently.
