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<p>Sodium acetate trihydrate (SAT) possesses a high latent heat of phase transition; however, its high degree of supercooling, low thermal conductivity, and susceptibility to phase separation limit its practical applications. This study proposes an XG-stabilized BNNS/Al<sub>2</sub>O<sub>3</sub> composite nucleation modification strategy that suppresses SAT supercooling through the combined regulation of Al<sub>2</sub>O<sub>3</sub> particles and two-dimensional BNNS, while utilizing BNNS to improve heat transfer performance. Experimental results show that 2 wt% XG effectively suppresses phase separation, 0.5 wt% Al<sub>2</sub>O<sub>3</sub> reduces the supercooling to 5.53 ℃, and BNNS further lowers the supercooling to 0.65 ℃ while increasing the thermal conductivity to 1.543&#xa0;W·m<sup>− 1</sup>·K<sup>− 1</sup>.Furthermore, after 100 thermal cycles, the composite exhibited good thermal energy retention capacity. This composite achieves a good overall balance between supercooling suppression, thermal energy storage density, and thermal conductivity, demonstrating application potential in the fields of low-to-medium-temperature thermal energy storage and thermal management.</p>

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Synergistic suppression of supercooling and thermal performance enhancement of sodium acetate trihydrate using BNNS/Al₂O₃ composite nucleating agents

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Qingyong Pang,
  • Xiangqing Meng,
  • Junfeng Han,
  • Min Jing,
  • Fukun Ma

摘要

Sodium acetate trihydrate (SAT) possesses a high latent heat of phase transition; however, its high degree of supercooling, low thermal conductivity, and susceptibility to phase separation limit its practical applications. This study proposes an XG-stabilized BNNS/Al2O3 composite nucleation modification strategy that suppresses SAT supercooling through the combined regulation of Al2O3 particles and two-dimensional BNNS, while utilizing BNNS to improve heat transfer performance. Experimental results show that 2 wt% XG effectively suppresses phase separation, 0.5 wt% Al2O3 reduces the supercooling to 5.53 ℃, and BNNS further lowers the supercooling to 0.65 ℃ while increasing the thermal conductivity to 1.543 W·m− 1·K− 1.Furthermore, after 100 thermal cycles, the composite exhibited good thermal energy retention capacity. This composite achieves a good overall balance between supercooling suppression, thermal energy storage density, and thermal conductivity, demonstrating application potential in the fields of low-to-medium-temperature thermal energy storage and thermal management.