TiN doped Ni-Co bimetal organic framework based-composite phase change material with enhanced photothermal conversion performance

作者：Wu, Ziheng; Ye, Zhaochun; Shi, Shasha; Fang, Yaobing; Li, Li; Yuan, Wenhui^*

来源：Solar Energy Materials and Solar Cells, 2022, 248: 112019.

DOI：10.1016/j.solmat.2022.112019

• Bimetallic MOF
• 1-Octadecanol
• Phase change materials
• Photothermal conversion
• TiN

Shape stability and excellent photothermal conversion performance are critical for composite PCMs in the field of solar energy utilization. This study prepares a nickel and cobalt-based bimetal organic framework (Ni-Co-BTC) which is further employed as the supporting material for 1-octadecanol (OD). The flower-like Ni-Co-BTC with an interconnected network exhibits large specific surface area, pore volume, and appropriate pore size distribution, which is conducive to the encapsulation of OD (up to 70 wt%). In addition, TiN nanoparticles are added to enhance the photothermal conversion performance of composite PCM. Therefore, the obtained OD/Ni-Co-BTC/ TiN composite PCM exhibits considerable thermal energy storage capacity (145.8 J/g) and remarkable photo -thermal energy conversion efficiency (up to 97.75%). Furthermore, the composite PCM has outstanding thermal stability and reliability, and the phase change enthalpy is reduced by only 1.7% after 100 cycles. Accordingly, the composite PCM shows a promising application potential in solar energy harvesting, conversion and storage.