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The Economic Times

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Scientists built a battery-free device that turns sunlight into fuel

Researchers at Osaka Metropolitan University have developed a battery-free artificial photosynthesis system that continuously converts sunlight, water and carbon dioxide into formic acid, a useful liquid fuel and energy-storage chemical. By redesigning the electrolyser to self-regulate under changing sunlight conditions, the team eliminated the need for batteries and complex electronic control systems, potentially making solar fuel production cheaper, simpler and easier to scale.

15 Jun 2026 11:59 am