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<p>This study develops high-performance shape-stabilized phase change materials (SSPCMs) by valorizing waste bamboo charcoal ash (BCA) and bamboo biochar (BB) as porous scaffolds. N-octadecane was encapsulated via vacuum infiltration, with expanded graphite (EG) added to enhance thermal conductivity. Characterization results reveal that BCA’s mesoporous structure (average pore diameter: 9.46 nm) enables a superior phase change material (PCM) loading of 55% (mass fraction) compared to BB (50%). The optimized composites exhibit high latent heat capacities (up to 124.2 J/g) and a tenfold increase in thermal conductivity (reaching 1.68 W/(m·K)). Notably, the BCA-based SSPCMs demonstrate excellent thermal reliability, maintain stability after 600 thermal cycles, and reduce supercooling by 36% due to the nucleation effect of inorganic ash residues. This work offers a sustainable, low-cost pathway for converting biomass waste into efficient energy storage materials.</p> Graphical abstract <p></p>

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Valorization of waste barbecue ash and bamboo biochar as sustainable scaffolds for high-conductivity phase change materials

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Chaoen Li,
  • Chengzhi Guo,
  • Xiaodong Wen,
  • JingJing Shao,
  • Wei Cai,
  • Jiayu Wu,
  • Mei Zhao,
  • Yin Tang,
  • Meng Wang,
  • Dongjing Liu,
  • Yang He,
  • Jiang Wu

摘要

This study develops high-performance shape-stabilized phase change materials (SSPCMs) by valorizing waste bamboo charcoal ash (BCA) and bamboo biochar (BB) as porous scaffolds. N-octadecane was encapsulated via vacuum infiltration, with expanded graphite (EG) added to enhance thermal conductivity. Characterization results reveal that BCA’s mesoporous structure (average pore diameter: 9.46 nm) enables a superior phase change material (PCM) loading of 55% (mass fraction) compared to BB (50%). The optimized composites exhibit high latent heat capacities (up to 124.2 J/g) and a tenfold increase in thermal conductivity (reaching 1.68 W/(m·K)). Notably, the BCA-based SSPCMs demonstrate excellent thermal reliability, maintain stability after 600 thermal cycles, and reduce supercooling by 36% due to the nucleation effect of inorganic ash residues. This work offers a sustainable, low-cost pathway for converting biomass waste into efficient energy storage materials.

Graphical abstract