Journal
NANO RESEARCH
Volume 10, Issue 3, Pages 802-813Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1333-1
Keywords
phase-change materials; hierarchical graphene foam; light-to-thermal energy conversion; thermal conductivity; solar energy
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Funding
- National Thousand Young Talents of China
- National Natural Science Foundation of China [21544001, 21603038, 51422305, 51421061]
- Innovation Team Program of Science & Technology Department of Sichuan Province [2014TD0002]
- State Key Laboratory of Polymer Materials Engineering [sklpme2014-2-02]
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Recently, graphene foam (GF) with a three-dimensional (3D) interconnected network produced by template-directed chemical vapor deposition (CVD) has been used to prepare composite phase-change materials (PCMs) with enhanced thermal conductivity. However, the pore size of GF is as large as hundreds of micrometers, resulting in a remarkable thermal resistance for heat transfer from the PCM inside the large pores to the GF strut walls. In this study, a novel 3D hierarchical GF (HGF) is obtained by filling the pores of GF with hollow graphene networks. The HGF is then used to prepare a paraffin wax (PW)-based composite PCM. The thermal conductivity of the PW/HGF composite PCM is 87% and 744% higher than that of the PW/GF composite PCM and pure PW, respectively. The PW/HGF composite PCM also exhibits better shape stability than the PW/GF composite PCM, negligible change in the phase-change temperature, a high thermal energy storage density that is 95% of pure PW, good thermal reliability, and chemical stability with cycling for 100 times. More importantly, PW/HGF composite PCM allows light-driven thermal energy storage with a high light-to-thermal energy conversion and storage efficiency, indicating its great potential for applications in solar-energy utilization and storage.
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