New Material Blends Enhance Long-Term Thermal Energy Storage and Controlled Release

What is it about?

The study examined the development of supercooled phase change materials (PCMs) for long-term thermal energy storage by integrating sodium alginate (SA) with a D-mannitol (DM) and erythritol (ET) system. The methodology involved using SA to form strong intermolecular hydrogen bonds with the hydroxyl groups of DM and ET, enhancing the stability of the supercooled state. The experimental results showed that with 3 wt % SA content, the composite exhibited a cold-crystallization enthalpy (ΔH cc) of 199.0 J/g, which was approximately 97% of pure DE's ΔH cc value, and maintained stability after three months of storage at room temperature. The study also demonstrated that the stored latent heat could be controllably released through different triggers, highlighting excellent cyclic stability. The research focused on overcoming the crystallization challenges of polyol-based PCMs by leveraging the dual stabilization mechanism of SA and the inherent properties of the cold-crystallizable PCMs. This approach provided a new pathway for extending the thermal storage duration of PCMs while preserving their latent heat capacity.

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Photo by Ayush Kumar on Unsplash

Photo by Ayush Kumar on Unsplash

Why is it important?

This study is important as it explores innovative approaches to enhance long-term thermal energy storage (TES) using supercooled phase change materials (PCMs). By integrating sodium alginate with a D-mannitol and erythritol system, the research provides a promising solution for improving energy efficiency and stability in renewable energy applications. This advancement addresses the critical need for dispatchable utilization of stored thermal energy, contributing to the development of sustainable and carbon-neutral technologies. The findings pave the way for more effective integration of renewable energy sources into existing energy systems, offering significant benefits for reducing reliance on fossil fuels and mitigating environmental impacts. Key Takeaways: 1. Improved Thermal Stability: The study demonstrates that incorporating sodium alginate into the D-mannitol and erythritol system results in stable phase change materials that maintain their properties after three months of room-temperature storage, overcoming previous limitations in long-term thermal storage stability. 2. High Latent Heat Retention: With 3 wt % sodium alginate, the composite exhibits a cold-crystallization enthalpy of 199.0 J/g, retaining approximately 97.0% of the latent heat capacity of pure D-mannitol and erythritol, ensuring efficient energy storage and release. 3. Enhanced Cyclic Stability: The research highlights the material's ability to undergo multiple thermal cycles with minimal degradation, providing reliable and controllable latent heat discharge through different triggers, which is crucial for practical energy storage applications.