期刊
ENERGY STORAGE MATERIALS
卷 20, 期 -, 页码 401-409出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.10.014
关键词
Solid-solid PCM; Carbon nanotube sponge; Nanopores confinement; Electro/photo charging; Thermal energy storage
资金
- National Natural Science Foundation of China [51772008]
- National Program for Support of Top-notch Young Professionals
- Changjiang Scholar Program
The widespread utilization of phase change materials (PCMs) in thermal energy storage technologies is often limited by the shape instability, rigidity, low conductivity and lack of multi-driven capabilities. Therefore, the functionalization of PCMs in order to overcome the aforementioned issues has remained an elusive goal. Herein, we infiltrate a polyethylene glycol (PEG) based solid-solid PCM into the pores of carbon nanotube sponge (CNTS) to fabricate a dual form-stable, flexible and highly conductive phase change composites (PCCs). The developed PCCs undergo nanopore-confined solid-solid phase transition triggered by a low voltage or sunlight with high electro/photo to thermal energy storage efficiency (> 94%). The reported energy conversion efficiencies for both electro and photo to thermal energy storage is highest among all functionalized PCCs and attributed to the excellent energy conversion/transfer performance of aligned carbon nanotubes (CNTs) network in the composite structure. In addition to extra shape stability, the solid-solid PCC present high axial thermal conductivity (2.4Wm(-1)k(-1)) as well as high-energy storage density 132 J g(-1) which is close to solid-liquid PCCs. Therefore, this study provides routes towards the development of real-life applicable PCCs for thermal energy applications.
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