High-Efficiency Thermal Energy Storage Material Developed to Boost Solar Power and Waste Heat Recovery

The ARCI team’s innovation lies in integrating tiny amounts of spinel oxide nanoparticles into conventional PCM to dramatically enhance its thermal performance.

In a major breakthrough for clean energy technology, researchers at the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), an autonomous institute under the Department of Science and Technology (DST), have developed a highly efficient and cost-effective thermal energy storage material capable of significantly improving the performance of thermal batteries used in concentrated solar power plants and industrial waste heat recovery systems.

The newly developed material has demonstrated an unprecedented increase in heat storage capacity, opening new possibilities for compact, high-performance, and affordable thermal energy storage systems that can support India's growing renewable energy ambitions and industrial energy efficiency goals.

Growing Need for Efficient Thermal Energy Storage

As countries worldwide accelerate the transition towards renewable energy and sustainable industrial systems, efficient thermal energy storage (TES) technologies are becoming increasingly important. Thermal energy storage systems help capture, store, and release heat energy whenever required, making renewable energy sources like solar power more reliable and efficient.

Concentrated Solar Power (CSP) plants, which use mirrors to concentrate sunlight and generate heat for electricity production, rely heavily on effective thermal storage materials to ensure uninterrupted energy supply even during non-sunlight hours. Similarly, many industries generate large amounts of waste heat during manufacturing processes, much of which goes unused due to the lack of efficient heat storage technologies.

Scientists globally have been searching for advanced materials with higher thermal conductivity, improved heat storage capacity, and better operating temperature ranges to improve the performance and economic viability of TES systems.

ARCI Researchers Develop Spinel Nanocomposite Phase Change Material

Addressing this challenge, the ARCI research team led by Dr. Mani Karthik has developed a scalable and low-cost process for producing advanced spinel nanocomposite phase change materials (PCM) with significantly enhanced thermal properties.

The researchers employed a simple co-precipitation method to synthesize spinel-type metal oxide nanoparticles with controlled particle sizes. These specially engineered nanoparticles demonstrated excellent thermal stability and uniform dispersion characteristics, making them highly suitable for next-generation thermal energy storage applications.

Phase Change Materials are substances capable of storing and releasing large amounts of thermal energy during phase transitions such as melting and solidification. They are widely used in thermal batteries, solar power systems, cooling technologies, and energy-efficient infrastructure.

The ARCI team's innovation lies in integrating tiny amounts of spinel oxide nanoparticles into conventional PCM to dramatically enhance its thermal performance.

45% Increase in Heat Storage Capacity Achieved

One of the most significant achievements of the research is the extraordinary improvement in the material's specific heat capacity — the ability of a substance to store thermal energy.

Researchers found that by adding just 1% spinel oxide nanoparticles into the phase change material, the thermal energy storage capacity increased by nearly 45% compared to conventional PCM without nanocomposites.

This substantial enhancement means the material can store far more thermal energy per unit mass, making thermal batteries more efficient and compact.

Scientists explained that the nanoparticles improve thermal performance by increasing the specific surface area inside the PCM. Once uniformly dispersed, they form a stable spinel oxide layer at the interface, which increases surface energy and enhances the material's heat storage capability.

The improved thermal behavior allows the nanocomposite material to absorb and retain larger amounts of heat while maintaining stability during repeated heating and cooling cycles.

Compact and Cost-Effective Energy Storage Solution

The breakthrough has important economic and engineering implications for future renewable energy infrastructure.

Because the new material can store more energy in a smaller volume, thermal storage systems can be made more compact. This directly reduces the size of storage tanks and lowers the amount of construction material required for thermal energy storage installations.

As a result, both capital expenditure and operational costs for concentrated solar power plants and industrial thermal management systems can be significantly reduced.

Experts believe this development could help improve the commercial viability of CSP technologies, which are often challenged by high infrastructure costs compared to conventional solar photovoltaic systems.

The compact nature of the new storage system could also benefit industries requiring thermal management in limited spaces, including manufacturing units, energy-intensive processing plants, and advanced heating systems.

Potential Applications Across Multiple Sectors

The advanced nanocomposite phase change material has the potential to support several sectors where thermal energy storage plays a crucial role.

Concentrated Solar Power Plants

The material can help CSP plants store more solar heat efficiently, enabling power generation even after sunset and improving grid stability.

Industrial Waste Heat Recovery

Large industries such as steel, cement, chemicals, and power generation can use the technology to capture and reuse waste heat, reducing energy losses and improving efficiency.

Thermal Batteries

The enhanced PCM can improve the performance of thermal batteries used in renewable energy systems and temperature management applications.

Sustainable Buildings and Cooling Systems

Future applications may include smart thermal management systems for energy-efficient buildings and advanced cooling technologies.

Contribution to India's Clean Energy Mission

The research aligns strongly with India's long-term clean energy and sustainability goals. The development supports national initiatives focused on renewable energy expansion, industrial energy efficiency, and indigenous technology development under the Aatma Nirbhar Bharat mission.

By developing advanced thermal storage materials domestically, India can reduce dependence on imported energy technologies while building local expertise in next-generation clean energy solutions.

The innovation also complements India's commitments towards climate action and carbon emission reduction by enabling more efficient use of renewable energy and industrial resources.

Published in International Scientific Journal

The research findings have been published in the internationally reputed journal Materials Today Chemistry published by Elsevier, highlighting the scientific significance and global relevance of the breakthrough.

The publication has attracted attention for demonstrating how small quantities of engineered nanoparticles can dramatically improve the thermal performance of phase change materials without significantly increasing production costs.

Researchers believe the technology can pave the way for future high-performance thermal energy storage materials with superior efficiency, durability, and scalability.

Advancing the Future of Energy Storage

As renewable energy systems continue to expand globally, advanced thermal energy storage technologies are expected to play a critical role in ensuring stable and efficient power supply.

The ARCI-developed nanocomposite PCM represents an important step toward creating more reliable, compact, and affordable thermal storage solutions capable of supporting both industrial sustainability and renewable energy integration.

With further development and commercial scaling, such innovations could transform how heat energy is stored and utilized across industries, significantly contributing to cleaner and more energy-efficient infrastructure in the future.