Yunnan University Researchers Achieve Record Underwater Solar Power at 10 Meters
Researchers from Yunnan University in China have made a breakthrough with perovskite solar cells that function effectively at depths of up to 10 meters (33 feet), marking a new milestone for submerged solar technology. Their findings, shared in Joule, explain how they enhanced the cells to capture blue and green light that can penetrate seawater. They used a polymer called polyhexamethylene guanidine hydrochloride to boost electron capture and added a waterproof layer to prolong the cells’ lifespan to five and a half years. In tests at 10 meters, the cells achieved nearly 35% efficiency, exceeding the Shockley-Queisser limit. Field trials off Weizhou Island recorded energy outputs sufficient to power small LEDs for hours. Professor Wen-Hua Zhang highlighted that previous studies only explored depths of 2 meters or less, making this research a significant advancement. While commercial use is still a way off, it opens doors for applications like livestreaming cameras and smart sensors, potentially leading to self-sustaining marine energy systems.
Key facts
- Researchers from Yunnan University in China developed perovskite-based solar cells that operate underwater at depths up to 10 meters (33 feet).
- The study was published in Joule.
- The cells use a polymer called polyhexamethylene guanidine hydrochloride and a water-repelling layer to enhance electron capture and delay water-induced degradation.
- Lab tests at simulated 10-meter depth achieved nearly 35% power conversion efficiency, exceeding the Shockley-Queisser limit of 33%.
- Field tests off Weizhou Island in the South China Sea used remotely operated robots and measured energy output at 2, 6, and 10 meters over two hours.
- Energy outputs were 1,416 mWh at 2 meters, 752 mWh at 6 meters, and 324 mWh at 10 meters—enough to power a small LED for a few hours.
- Professor Wen-Hua Zhang stated that previous underwater solar cell studies were limited to depths of 2 meters or less.
- The technology could eventually power academic and technological resources like livestreaming cameras and smart sensor networks, though commercial application is not imminent.
Entities
Artists
- Wen-Hua Zhang
Institutions
- Yunnan University
- Joule
- Science Alert
- Depositphotos
Locations
- China
- Weizhou Island
- South China Sea