Source: DD News
Subject: Science and Technology
Context: Indian scientists have developed a single-unit solar device that can capture and store solar energy simultaneously, eliminating the need for separate harvesting and storage systems.
About Single-unit solar energy capture and storage device:
What is it?
- It is a photo-rechargeable supercapacitor—a next-generation energy device that integrates solar energy harvesting and electrical energy storage in a single unit, unlike conventional solar systems that require separate solar cells and batteries/supercapacitors.
Developed by:
- Scientists at the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru
- Under the Department of Science and Technology (DST), Ministry of Science and Technology
Aim:
- To develop efficient, low-cost, compact and eco-friendly energy storage systems
- To support portable, wearable, miniaturised, and off-grid technologies
- To reduce energy losses, system complexity, and dependence on fossil fuels and conventional batteries
How it works?
- The device uses binder-free nickel–cobalt oxide (NiCo₂O₄) nanowires grown directly on nickel foam through an in-situ hydrothermal process.
- These nanowires form a highly porous, conductive three-dimensional network.
- The same material structure:
- Absorbs sunlight (acting as a photo-harvester), and
- Stores electrical charge (acting as a supercapacitor electrode).
- This dual functionality removes the need for external power-management electronics, minimizing voltage/current mismatch losses.
Key features:
- Single integrated unit for energy harvesting and storage.
- Stable output voltage of ~1.2 V.
- High durability: ~88% capacitance retention after 1,000 photo-charging cycles.
- Wide operating range: works from low indoor light to intense sunlight.
- Compact and lightweight, ideal for autonomous and miniaturised devices.
- Off-grid capability, suitable for remote and energy-poor regions.
- Supports transition towards clean, renewable, and sustainable energy systems.
