Carbonized conjugated microporous polymers hollow spheres incorporated with fatty alcohols for ultra-highly efficient energy storage and conversion

With the increasing global instability in the development of the world, the efficient storage and conversion of energy have alerted attention. In this work, a novel conjugated microporous polymer hollow spheres (CMPHS) with a high specific surface (323 m2 g-1) and unique cavity structure are creatively prepared. By treatment with simple carbonization, the resulting carbonized microspheres (CCMPHS) show a high light absorption (80%) and outstanding thermal stability (thermal decomposition at 506 degrees C). On basis of the abundant micropores distrib-uted on the surface of microspheres, the organic phase change materials (PCMs) i.e., fatty alcohols (tetradecanol (TD), hexadecanol (HD), and octadecanol (OD)), are successfully embedded into CCMPHS to afford a kind of new composite (CCMPHS@PCMs) for energy storage and conversion. The three kinds of CCMPHS@PCMs exhibit high latent heats (220.1 kJ kg -1, 244.6 kJ kg -1, and 228.8 kJ kg-1, respectively.). In terms of energy conversion, the photothermal conversion efficiencies of CCMPHS@PCMs are up to 86.83%, 89.45%, and 85.40% and the elec-trothermal conversion efficiencies are 83.81%, 81.10%, and 90.50%, which possess one of the highest values among the most of similar composites embed with PCMs reported to dates. Based on the advantages of simple fabrication, easy to scale up, high energy density, and conversion efficiency, the CCMPHS@PCMs are expected to be one of the most promising candidates as efficient PCMs composite for a variety of practical applications such as solar or electric energy harvesting, storage, conversion, and so on.

Automated summary

In this study, a novel conjugated microporous polymer hollow spheres (CMPHS) with high specific surface and unique cavity structure were prepared, which showed high light absorption and outstanding thermal stability. By embedding organic phase change materials (PCMs) into the resulting carbonized microspheres (CCMPHS), a new composite (CCMPHS@PCMs) for energy storage and conversion was achieved. The composite exhibited high latent heats and efficient photothermal and electrothermal conversion efficiencies. Based on its advantages of simple fabrication, scalability, high energy density, and conversion efficiency, the CCMPHS@PCMs are expected to be a promising candidate for various practical applications.