MOF衍生碳/氧化锌协同增强相变材料光热转换

Abstract: The weak photon-capturing ability is a long-standing bottleneck for pristine metal-organic framework (MOF)-based phase change materials (PCMs) in photothermal conversion and latent heat storage applications. Herein, we designed MOF-5-derived hierarchical nanoporous carbon/ZnO nanoparticle hybrid as dual efficient photonic harvester and molecular heater for synergistically boosting photothermal conversion and storage capability of PCMs using an in-situ anchoring strategy. Compared with postdecorated ZnO strategy, ZnO photosensitizers derived in situ from MOF-5 are capable of guaranteeing high dispersibility and enhanced photon-capturing capability in the hierarchical carbon framework. Resultantly, high-performance photothermal composite PCMs are obtained due to the constructed intense and broadband absorption photonic nanoheaters after paraffin wax (PW) is encapsulated inside MOF-5-derived hierarchical nanoporous carbon/ZnO (MOF-5-PC/ZnO). Benefiting from the synergistic effect of dual high-efficiency photonic harvester and molecular heater (MOF-5-derived ZnO nanoparticles and hierarchical nanoporous carbon), PW@MOF-5-PC/ZnO-700℃ composite PCMs obtain the optimal photothermal conversion and storage capacity. Meanwhile, PW@MOF-5-PC/ZnO composite PCMs exhibit superior shape stability, thermal stability, and durable reliability. Importantly, our proposed development strategy of high-efficiency photothermal composite PCMs is universal due to high customization and universality of PCMs and Zn-MOFs.

Figure 1. Preparation schematic of MOF-5-PC/ZnO composite PCMs. (b-d) SEM images of MOF-5-PC/ZnO at different carbonization temperatures (600, 700, and 800). (e-g) The corresponding SEM images of PW@MOF-5-PC/ZnO composite PCMs.

Figure 2. (a) Photothermal conversion mechanism of PW@MOF-5-PC/ZnO composite PCMs. (b) UV-Vis absorption spectra of PW and PW@MOF-5-PC/ZnO composite PCMs. (c) Photothermal conversion curves of PW@MOF-5-PC/ZnO composite PCMs under solar simulator radiation of 150 mW/cm2. (d) Average photothermal conversion rates of PW@MOF-5-PC/ZnO composite PCMs. (e) IR thermal images of wearable PW@MOF-5-PC/ZnO-PU composite film under solar irradiation.

文献链接：Ang Li*1, Ying Wan1, Yan Gao, Zhaodi Tang, Jianhang Xu, Mengke Huang, Yang Li, Xiaowei Zhang*, Xiao Chen*. MOF-derived hierarchical carbon/ZnO hybrid synergistically boosts photothermal conversion and storage capability of phase change materials. Materials Today Nano, 2022, 20, 100277.