Researchers in Germany have shown that even centuries-old lead waste can be reborn as a high-value material for clean energy. By sourcing antique musket balls from eBay, the team at Jülich Research Centre converted the metal into a key ingredient for perovskite solar cells.
The project targets a major challenge in next-generation photovoltaics: perovskites can deliver strong performance, but they often depend on high-purity lead. Rather than relying on newly mined material, the scientists tested whether heavily contaminated historical lead could be purified and reused in a modern solar supply chain.
A Two-Step Purification Method
The team first melted the old musket balls and used an electrochemical bath to separate the lead from dirt, oxidation, and other residues. That process produced lead iodide with 94% efficiency. A second refinement stage then removed trace metals such as copper, silver, and zinc, raising the purity to 99.999%.
When the recycled material was used to build solar cells, the devices converted about 21% of incoming sunlight into electricity. That result matched control cells made from commercial lead, showing that reclaimed material can perform at an industrially relevant level.
Published in Cell Reports Physical Science, the study points to a circular model for solar manufacturing, where legacy waste streams can be transformed into advanced energy materials instead of being discarded. The approach could help reduce pressure on mining while improving the sustainability of future photovoltaic production.
As methods like this mature, they may reshape how clean-energy materials are sourced, making solar technology more circular, scalable, and resource-efficient in the years ahead.
