Scientists from Tomsk Polytechnic University, together with colleagues from China, have developed a micro-supercapacitor capable of operating stably in extreme temperatures. The device retains more than 75.5% of its capacity in the range from −30 to +80 °C, "Pervomu Tekhnicheskomu" was told in the press service of the university.
The development solves the main problem of flexible power sources — ordinary electrolytes freeze in the cold and dry out in the heat. The new solution uses a hydrogel with trehalose, which simultaneously prevents ice formation and slows down moisture evaporation.
The basis of the device is nanostructures of molybdenum disulfide deposited on a graphene substrate. Their "floral" shape increases the surface area and increases the efficiency of charge accumulation.
Modern wearable electronics today have serious requirements — it must not only have a high amount of energy, but also be flexible, lightweight, withstand temperature changes and body movement. Our technology provides high specific capacity and durability, but at the same time consists of inexpensive materials.
Tests have shown that after 8,000 cycles, the device retains more than 88% of its capacity at room temperature. Under extreme conditions, the figure remains above 75%, which makes the technology suitable for real-world tasks.
The technology can form the basis of new devices — from medical sensors to autonomous power systems.
