热能储存
材料科学
石蜡
石墨烯
复合数
复合材料
太阳能
热导率
储能
能量转换
热的
相变材料
热能
蜡
纳米技术
热力学
物理
功率(物理)
生物
生态学
作者
Lianbin Zhang,Renyuan Li,Bo Tang,Peng Wang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:8 (30): 14600-14607
被引量:173
摘要
Among various utilizations of solar energy, solar-thermal conversion has recently gained renewed research interest due to its extremely high energy efficiency. However, one limiting factor common to all solar-based energy conversion technologies is the intermittent nature of solar irradiation, which makes them unable to stand-alone to satisfy the continuous energy need. Herein, we report a three-dimensional (3D) graphene foam and phase change material (PCM) composite for the seamlessly combined solar-thermal conversion and thermal storage for sustained energy release. The composite is obtained by infiltrating the 3D graphene foam with a commonly used PCM, paraffin wax. The high macroporosity and low density of the graphene foam allow for high weight fraction of the PCM to be incorporated, which enhances the heat storage capacity of the composite. The interconnected graphene sheets in the composite provide (1) the solar-thermal conversion capability, (2) high thermal conductivity and (3) form stability of the composite. Under light irradiation, the composite effectively collects and converts the light energy into thermal energy, and the converted thermal energy is stored in the PCM and released in an elongated period of time for sustained utilization. This study provides a promising route for sustainable utilization of solar energy.
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