基于无机中空微球的能量存储相变复合材料及其全光谱吸收太阳能光热转换用于防/除冰

Abstract The development of high-efficiency solar photothermal conversion and storage materials is critical to address the intermittency and randomness of solar energy. In this paper, we prepared magnéli-phase Ti n O 2n-1 (Ti 4 O 7 ) mesoporous hollow microspheres as photothermal materials by employing titanium dioxide and polydopamine as raw materials and using the high-temperature carbothermal reduction method. The Ti 4 O 7 /PCMs with photothermal conversion and energy storage are synthesized by vacuum impregnation of different carbon chain fatty amines (Tetradecylamine (TDA), Hexadecylamine (HDA), and Octadecylamine (ODA)) as PCMs into the Ti 4 O 7 . The Ti 4 O 7 /PCMs exhibit superhydrophobicity and resistance to acid and alkali. The hollow structures help to minimize light reflection by enhancing light scattering and coupling, the photothermal conversion efficiencies of Ti 4 O 7 /TDA, Ti 4 O 7 /HDA, and Ti 4 O 7 /ODA are 89.9 %, 89.5 %, and 90.3 %, respectively, with thermal conductivities of 0.410 W·m −1 ·K −1 , 0.405 W·m −1 ·K −1 , and 0.418 W·m −1 ·K −1 , and latent heats of 155.8 J·g −1 , 162.1 J·g −1 and 151.9 J·g −1 . Meanwhile, the nanoconfinement effect of the Ti 4 O 7 hollow structure effectively solves the leakage problem of fatty amine during the phase change process. The Ti 4 O 7 /PCMs are assembled by spraying, brushing, and molding to meet the needs of multiple working conditions, and their photothermal and electrothermal conversion performances are remarkable in applying anti-/de-icing.