Empowering CO₂ Eco-Refrigeration With Colossal Breathing-Caloric-Like Effects in MOF-508b.

Area of Science:

• Materials Science
• Thermodynamics
• Sustainable Energy

Background:

• Refrigeration and heating account for significant energy consumption.
• Carbon dioxide (CO2) is emerging as an eco-friendly refrigerant, but faces challenges with high operating pressures and a low critical temperature.
• Existing CO2 systems require complex technology due to these limitations.

Purpose of the Study:

• To investigate the breathing-caloric-like effects of MOF-508b for CO2-based thermoregulation.
• To develop a novel thermometry device utilizing MOF-508b and CO2 at reduced pressures.
• To assess the potential of MOF-508b in practical cooling and heating applications.

Main Methods:

• Synthesis and characterization of MOF-508b.
• Experimental evaluation of the breathing-caloric effect under varying CO2 pressures.
• Fabrication and testing of a prototype thermometry device.

Main Results:

• MOF-508b exhibits breathing-caloric effects 40% superior to MIL-53(Al).
• The material achieves a temperature change (ΔT) of approximately 30 K at room temperature and 26 bar CO2 pressure.
• The device demonstrated heating to 56 °C and cooling to -10 °C.

Conclusions:

• MOF-508b offers a promising alternative for CO2-based cooling and heating technologies.
• The developed thermometry device operates efficiently at lower pressures and room temperature.
• This advancement could lead to more sustainable and less complex refrigeration and air conditioning systems.