H.Q. Liu#, F. Zhou#, X.Y. Shi, K.Y. Sun, Y. Kou, P. Das, Y.G. Li, X.Y. Zhang, S. Mateti, Y. (lan) Chen*, Z.-S. Wu*, Q. Shi*

Nano-Micro Letters, 2023, 15, 29.

DOI: 10.1007/s40820-022-00991-6 [PDF]

Phase change materialshave a key role for wearable thermal management, but suffer frompoorwater vapor permeability, low enthalpy value and weak shape stability caused by liquid phase leakage and intrinsic rigidity of solid-liquid phase change materials. Herein, we report for the first time a versatile strategy for designed assembly of high-enthalpy flexible phase change nonwovens (GB-PCN) by wet-spinning hybrid graphene-boron nitride (GB) fiber and subsequent impregnating paraffins (e.g.,eicosane,octadecane). As a result, our GB-PCN exhibited an unprecedented enthalpy value of 206.0 J g^-1, excellent thermal reliability andanti-leakage capacity, superb thermal cycling ability of97.6 % after 1000 cycles, and ultrahigh water vapor permeability (close to the cotton), outperforming the reported PCM films and fibers to date. Notably, the wearable thermal management systems based on GB-PCN for bothclothing and face maskwere demonstrated, which can maintain the human body at a comfortable temperature range for a significantly long time. Therefore, our results demonstrate huge potential of GB-PCN for human-wearable passive thermal management in real scenarios.