Development of dual-shell phase change microcapsules with enhanced thermal conductivity and photothermal conversion efficiency for advanced building thermal management

作者：Jun Li, Yingbiao Yuan, Dehao Li, Lihang Yang, Yutao Wang, Mingfeng Chen, Renjie Chen · 发表于：Journal of Energy Storage · 年份：2025 · DOI：10.1016/j.est.2025.118959 · 被引用次数：12 · 研究领域：Phase Change Materials Research、Solar Thermal and Photovoltaic Systems、Nanofluid Flow and Heat Transfer

To enhance the thermal conductivity (k) and photothermal conversion efficiency of phase change microcapsules, we developed dual-shell phase change microcapsules via a bonding method. The outer shell layer consists of molybdenum disulfide (MoS 2 ), and the inner shell layer is made of melamine-formaldehyde (MF) resin. The prepared phase change microcapsules exhibit excellent heat storage, thermal stability, thermal conductivity, photothermal conversion, and flame retardancy performance. The effects of the MoS₂ shell layer proportion on the microstructure, leakage performance, thermal conductivity, photothermal conversion efficiency, heat storage performance, and flame retardancy of the microcapsules were investigated. Additionally, the mechanisms behind the enhancement of photothermal conversion and thermal conductivity in the dual-shell microcapsules were analyzed. The results indicate that when the MoS₂ shell layer proportion reaches 10 %, the phase change enthalpy of the dual-shell microcapsules is 148.2 J/g, with an encapsulation efficiency of 67.9 %. Compared to single-shell microcapsules made solely of MF resin, the thermal conductivity of the dual-shell microcapsules improved by 172.2 %. When applied to building energy conservation, the microcapsules can more rapidly bring indoor temperatures to a comfortable level while delaying heat loss after sunset, thereby improving occupant comfort and reducing the use of high-energy-consuming equipment such as air conditioning. F...