TaON doped metal-organic frameworks-based composite phase change materials with excellent photo-thermal conversion performance

It is of great significance for designing prospective composite phase change materials (PCMs) with high shape-stabilized property, good thermal conductivity and efficient energy storage and conversion capacity. This study successfully developed a novel composite PCMs that TaON nanoparticles doped polyethylene glycol/metal-organic frameworks (PEG/MOFs) using a convenient impregnation method. The inherent favorable thermal conductivity of HKUST-1 and the excellent visible light absorption ability of TaON endowed the composite PCMs with remarkably improved thermal conductivity (increased by 126.7% over pure PEG) and remarkable photo-thermal conversion ability (η: 89.9–94.6%). Furthermore, the composite PCMs exhibited not only high shape stability, high thermal energy storage capacity (148.1 J/g) but also outstanding thermal stability and reliability. Accordingly, this novel photothermal composite PCMs would be hopefully applied to efficient storage, management and utilization for solar energy.