中文摘要：

最近， graphene 泡沫(GF ) 与一三维(3D ) 互连指导模板的化学蒸汽免职(CVD ) 生产的网络被用来与提高的热电导率准备合成阶段变化材料(脉冲编码调制) 。然而， GF 的毛孔尺寸象几百测微计一样大，导致为从在到 GF 神气墙的大毛孔内的 PCM 的热转移的一个显著热电阻。在这研究，新奇 3D 层次 GF (HGF ) 被用空 graphene 网络填满 GF 的毛孔获得。HGF 然后被用来准备基于的石蜡蜡(PW ) 合成脉冲编码调制。PW/HGF 合成脉冲编码调制的热传导性分别地比 PW/GF 合成脉冲编码调制和纯 PW 的高是 87% 和 744% 。PW/HGF 合成脉冲编码调制也与在 100 次骑车比 PW/GF 合成脉冲编码调制，在阶段变化温度的可以忽略的变化，是 95% 纯 PW 的高热的精力存储密度，好热可靠性，和化学稳定性展出更好的形状稳定性。更重要地， PW/HGF 合成脉冲编码调制与高 light-to-thermal 精力变换和存储效率允许光驱动的热精力存储，显示它为在太阳能的利用和存储的应用的大潜力。

英文摘要：

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.