Journal
ACS APPLIED NANO MATERIALS
Volume 6, Issue 22, Pages 21270-21281Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.3c04514
Keywords
aerogel; PCMs; flame retardancy; solar-thermalconversion; energy storage
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This research constructs composite phase change materials with dual thermal conductivity networks using graphene and boron nitride, demonstrating excellent latent efficiency, high thermal conductivity, thermal stability, and flame-retardant performance.
Phase change energy storage technology provides a viable option for the use of solar energy; however, its potential shortcomings such as low thermal conductivity, phase change leakage, and fire hazards have led to defective applications. In this paper, graphene/boron nitride (GB) aerogels with dual thermal conductivity networks are constructed using boron nitride precursors BM (boric acid and melamine) and graphene oxide through a self-assembly method during reduction and calcination. The GB aerogels are then vacuum impregnated with paraffin wax (PW) to prepare PW-GB composite phase change materials (PCMs). The results show that the dual-layer network structure ensures that the PW-G(4)B(2) composites have outstanding latent efficiency (96.7%) as well as a low leakage rate of 3.0%. Thanks to the highly thermally conductive BN fiber attachment, the thermal conductivity of PW-GB reaches 0.4108 W/(m.K), which is 81.5% higher than that of pure PW. Meanwhile, its photothermal conversion efficiency reaches 78.99% at 100 mW/cm(2) optical density, showing great potential for thermal management in photothermal conversion applications. Moreover, the synergistic barrier effect of BN fibers with excellent thermal stability and graphene nanosheets results in significant improvements in the thermal stability and flame-retardant performance.
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