BY THE OPTIMIST DAILY EDITORIAL TEAM Concrete is one of civilization’s oldest building blocks as well as one of its most ubiquitous. From bridges and buildings to sidewalks and stadiums, it forms the backbone of modern life. Now, researchers are reimagining this ancient material not just as structural support, but as a potential solution to one of our biggest climate challenges: energy storage. A team from the Massachusetts Institute of Technology (MIT) has created a new form of concrete that functions like a battery. Published in the journal PNAS, the study reveals how a blend of cement, water, ultra-fine carbon black, and electrolytes can form an “electron-conducting carbon concrete,” or ec3. This innovative mixture builds a conductive nanonetwork within the concrete itself, allowing it to store and release electricity. Why concrete, why now? Concrete innovation isn’t new. Recent breakthroughs have produced self-healing concrete, carbon-sequestering concrete, and even concrete designed to boost crop yields. But ec3 represents a leap beyond durability or emissions and straight into multifunctionality. “The Ancient Romans made great advances in concrete construction. Massive structures like the Pantheon stand to this day without reinforcement,” said MIT materials scientist Admir Masic. “If we keep up their spirit of combining material science with architectural vision, we could be at the brink of a new architectural revolution with multifunctional concretes like ec3.” A miniature arch, a big idea To test their theory, researchers built a small arch from ec3. It powered an LED light with nine volts of electricity while holding its own structural weight. The light dimmed and flickered under stress, indicating that the material could one day double as a diagnostic tool for infrastructure health. “We may be able to use this as a signal of when and to what extent a structure is stressed, or monitor its overall health in real time,” Masic explained. In other words, concrete could soon not only support buildings but also warn us when they need repair. The green energy angle The most promising application for this breakthrough is renewable energy storage. As solar and wind power production increases, storing that energy efficiently has become an urgent challenge. That’s where ec3 comes in. Because concrete is so prevalent across cities, homes, and highways, incorporating battery technology into infrastructure could help reduce pressure on the power grid and increase energy resilience. “What excites us most is that we’ve taken a material as ancient as concrete and shown that it can do something entirely new,” said James Weaver, co-author of the study. “By combining modern nanoscience with an ancient building block of civilization, we’re opening a door to infrastructure that doesn’t just support our lives, it powers them.” Where this could lead This battery concrete isn’t ready for mass deployment just yet. The team is still refining the material’s performance, scalability, and energy density. But the potential is enormous. Buildings, roads, and bridges could someday become energy storage devices, playing a role in reducing emissions and creating more resilient, self-powered infrastructure. While the Romans couldn’t have imagined concrete that flickers under pressure or powers an LED, they likely would have appreciated its ingenuity. Just as their concrete helped structures stand the test of time, ec3 could help modern infrastructure rise to meet the climate challenges of the future. Source study: PNAS—High energy density carbon–cement supercapacitors for architectural energy storageThe post Concrete that powers cities? Scientists turn ancient material into giant batteries first appeared on The Optimist Daily: Making Solutions the News.