Researchers at Osaka Metropolitan University have developed an artificial photosynthesis system that converts carbon dioxide and water into formic acid using sunlight, even in low-light conditions. Unlike conventional solar systems that need battery backup to handle fluctuations in sunlight, this device uses a redesigned electrolyzer that partially self-regulates, producing a steady stream of formic acid throughout the day. In real-world testing, the system generated pure aqueous formic acid under changing light intensity without relying on external control hardware. Formic acid is a promising solar fuel and hydrogen carrier that can be used directly or converted to hydrogen for energy storage and transport. The key innovation is the electrolyzer design that maintains production stability without the usual battery-based smoothing hardware. This brings artificial photosynthesis closer to the performance of natural leaves, which can harness solar energy even in dim conditions. The work represents a step toward practical solar fuel production that could complement existing renewable energy systems.
