DST Scientists Develop Photo-Rechargeable Supercapacitor

Indian scientists have developed a solar-powered energy storage device that can both capture and store energy within a single unit, marking a significant advance in clean and self-sustaining power technologies. The innovation is expected to reduce costs, improve efficiency and support decentralised energy solutions, particularly for portable and off-grid applications.

Breakthrough in Integrated Energy Storage

The new technology, known as a photo-rechargeable supercapacitor, has been developed by researchers under the Department of Science and Technology. Unlike conventional solar systems that rely on separate components for energy harvesting and storage, the device integrates both functions into a single unit, thereby minimising energy losses during conversion and reducing system complexity.

Role of Advanced Nanomaterials

The device has been developed at the Centre for Nano and Soft Matter Sciences, Bengaluru, under the Ministry of Science and Technology. It uses binder-free nickel-cobalt oxide (NiCo₂O₄) nanowires uniformly grown on nickel foam through an in situ hydrothermal process. These nanowires form a highly porous and conductive three-dimensional network that efficiently absorbs sunlight while simultaneously storing electrical charge.

Performance and Operational Stability

During testing, the photo-rechargeable supercapacitor delivered a stable output voltage of 1.2 volts and retained 88 per cent of its capacitance even after 1,000 photo-charging cycles. The device performed efficiently under a wide range of lighting conditions, from low indoor illumination to intense sunlight. This demonstrates strong mechanical and electrochemical stability, making it suitable for long-term use in real-world environments.

Important Facts for Exams

• Photo-rechargeable supercapacitor integrates solar harvesting and energy storage.
• Developed by scientists under the Department of Science and Technology.
• Uses nickel-cobalt oxide nanowires grown via hydrothermal process.
• Designed for portable, wearable and off-grid energy applications.

Implications for Clean and Off-Grid Energy

The self-charging power system can function in remote areas without access to electricity grids and can reduce dependence on fossil fuels and conventional batteries. By eliminating the need for complex power management electronics, the innovation offers a compact, efficient and eco-friendly solution for next-generation autonomous devices and decentralised energy systems.