Indian Scientists Develop Solar-Powered Self-Charging Energy Storage Device

Integrated Solar Harvesting and Storage Breakthrough

Indian researchers have developed an advanced solar-powered energy storage device that can capture and store energy within a single unit , marking a major step forward in clean and self-sustaining power technologies. The innovation is expected to lower system costs, enhance efficiency, and support decentralised, portable, and off-grid energy solutions , particularly in areas with limited access to conventional electricity infrastructure.

What Makes the Innovation Unique?

The technology, known as a photo-rechargeable supercapacitor , has been developed under the Department of Science and Technology . Unlike traditional solar energy systems—where photovoltaic panels and batteries operate as separate components—this device integrates solar energy harvesting and electrical energy storage into a single platform .

This integrated design reduces energy losses during conversion, simplifies system architecture, and eliminates the need for additional power management electronics.

Role of Advanced Nanomaterials

The device was 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 grown directly on nickel foam using an in situ hydrothermal process . These nanowires form a highly porous, conductive three-dimensional network , enabling efficient sunlight absorption while simultaneously storing electric charge.

Performance and Stability Outcomes

During experimental testing, the photo-rechargeable supercapacitor demonstrated:

• A stable output voltage of 1.2 volts

• 88% capacitance retention after 1,000 photo-charging cycles

• Reliable performance across low indoor light to strong sunlight

The results indicate strong electrochemical, mechanical, and operational stability , making the device suitable for long-term deployment in real-world conditions.

Applications in Clean and Off-Grid Energy

The innovation has significant implications for remote and energy-deficient regions , where grid connectivity is limited or absent. By combining harvesting and storage, the device reduces dependence on fossil fuels and conventional batteries.

Its compact and efficient design makes it well suited for:

• Portable and wearable electronics

• Autonomous sensors and IoT devices

• Off-grid and rural energy systems

The technology represents a scalable, eco-friendly alternative for next-generation clean energy applications.

Exam-Focused Key Points

• Photo-rechargeable supercapacitor integrates solar harvesting and energy storage

• Developed under the Department of Science and Technology

• Uses nickel-cobalt oxide nanowires via hydrothermal synthesis