Advanced phase change composite by thermally annealed defect-free graphene for thermal energy storage

Guoqing Xin, Hongtao Sun, Spencer Michael Scott, Tiankai Yao, Fengyuan Lu, Dali Shao, Tao Hu, Gongkai Wang, Guang Ran, Jie Lian

Research output: Contribution to journalArticlepeer-review

114 Scopus citations


Organic phase change materials (PCMs) have been utilized as latent heat energy storage and release media for effective thermal management. A major challenge exists for organic PCMs in which their low thermal conductivity leads to a slow transient temperature response and reduced heat transfer efficiency. In this work, 2D thermally annealed defect-free graphene sheets (GSs) can be obtained upon high temperature annealing in removing defects and oxygen functional groups. As a result of greatly reduced phonon scattering centers for thermal transport, the incorporation of ultralight weight and defect free graphene applied as nanoscale additives into a phase change composite (PCC) drastically improve thermal conductivity and meanwhile minimize the reduction of heat of fusion. A high thermal conductivity of the defect-free graphene-PCC can be achieved up to 3.55 W/(m K) at a 10 wt % graphene loading. This represents an enhancement of over 600% as compared to pristine graphene-PCC without annealing at a comparable loading, and a 16-fold enhancement than the pure PCM (1-octadecanol). The defect-free graphene-PCC displays rapid temperature response and superior heat transfer capability as compared to the pristine graphene-PCC or pure PCM, enabling transformational thermal energy storage and management.

Original languageEnglish (US)
Pages (from-to)15262-15271
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number17
StatePublished - Sep 10 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science


  • graphene
  • phase change enthalpy
  • phase change materials
  • thermal conductivity
  • thermal energy storage


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