MoS2@CNTs基相变材料用于光热存储和微波吸收

Abstract: Developing advanced nanocomposite integrating solar-driven thermal energy storage and thermal management functional microwave absorption can facilitate the cutting-edge application of phase change materials (PCMs). To conquer this goal, herein, two-dimensional MoS2 nanosheets are grown in situ on the surface of one-dimensional CNTs to prepare core-sheath MoS2@CNTs for the encapsulation of paraffin wax (PW). Benefiting from the synergistic enhancement photothermal effect of MoS2 and CNTs, MoS2@CNTs is capable of efficiently trapping photons and quickly transporting phonons, thus yielding a high solar-thermal energy conversion and storage efficiency of 94.97%. Meanwhile, PW/MoS2@CNTs composite PCMs exhibit a high phase change enthalpy of 101.60 J/g and excellent long-term thermal storage durability after undergoing multiple heating–cooling cycles. More attractively, PW/MoS2@CNTs composite PCMs realize thermal management functional microwave absorption in heat-related electronic application scenarios, which is superior to the single microwave absorption of traditional materials. The minimum reflection loss (RL) for PW/MoS2@CNTs is -28 dB at 12.91 GHz with a 2.0 mm thickness. This functional integration design provides some insightful references on developing advanced microwave absorbing composite PCMs, holding great potential towards high-efficiency solar energy utilization and thermally managed microwave absorption fields.

Figure 1. Conception diagram of potential application of composite PCMs for outdoor activities.

Figure 2. (a) Synthetic procedure of PW/MoS2@CNTs. (bd) SEM images of MoS2@CNTs. (e, f) TEM image and HRTEM image of MoS2@CNTs-3. (g) SAED pattern of MoS2@CNTs-3. (h) EDX elemental mapping of MoS2@CNTs-3.

Figure 3. (a) UV–Vis-NIR absorption spectra of PW and PW/MoS2@CNTs. (b) Time-temperature evolution curves of composite PCMs at simulated solar irradiation. (c) Energy conversion efficiency of composite PCMs. (d) Schematic illustration of solar-thermal energy conversion mechanism of PW/MoS2@CNTs. LUMO and HOMO represent the lowest unoccupied molecular orbital and highest occupied molecular orbital, respectively; VB and CB represent the valence band and the conduction band, respectively.

Figure 4. RL curves of (a) PW/MoS2@CNTs-1. (b) PW/MoS2@CNTs-2. (c) PW/MoS2@CNTs-3. (d) Schematic illustration of the microwave absorption mechanism of PW/MoS2@CNTs-3.

文献链接：Panpan Liu1, Yang Li1, Zhaodi Tang, Junjun Lv, Piao Cheng, Xuemei Diao, Yu Jiang, Xiao Chen*, Ge Wang*. Integrating thermal energy storage and microwave absorption in phase change material-encapsulated core-sheath MoS2@CNTs. Journal of Energy Chemistry, 2023, 84, 41-49.