Sepiolite Nanocarriers as a Matrix for Controlled Thermal Energy Storage

Area of Science:

• Materials Science
• Nanotechnology
• Energy Storage

Background:

• Phase-change materials (PCMs) are crucial for thermal energy storage.
• Developing stable and high-performance PCMs is essential for efficient energy utilization.
• Natural nanocarriers offer a sustainable matrix for advanced composite materials.

Purpose of the Study:

• To fabricate a form-stable phase-change composite using eutectic hydrated salt (EHS) and sepiolite nanocarriers.
• To investigate the thermal properties and stability of the EHS@sepiolite composite.
• To evaluate the potential of this composite for nanoscale energy storage applications.

Main Methods:

• Fabrication of EHS@sepiolite composite via vacuum impregnation.
• Characterization of the composite's structure, thermal properties (melting temperature, enthalpy), and stability.
• Assessment of material loading capacity and retention of salt crystallinity.

Main Results:

• High loading capacity of 88 wt% for the phase-change material achieved.
• Composite exhibited a melting temperature of 38.1 °C and melting enthalpy of 185 J g⁻¹.
• Excellent thermal stability demonstrated over 50 heat cycles with consistent performance.

Conclusions:

• The EHS@sepiolite composite is a stable and efficient material for thermal energy storage.
• The use of natural sepiolite nanocarriers provides a cost-effective and abundant matrix.
• This composite shows significant potential for practical, scalable energy storage solutions.