Abstract The energy harvesting performance of the shape memory materials (SMM) depends on the recovery rate and recovery force of SMM. In this work, the shape memory vapor grown carbon fiber/graphene oxide/epoxy (VGCF/GO/EP) were prepared, and the thermodynamic coupling behaviors and the energy harvesting property of the composites were investigated via homemade evaluation apparatus, respectively. The experimental results showed that the addition of VGCF-GO fillers can effectively improve the thermal response recovery rate of EP in the stretching stage below the strain of approximately 10%. At 10% pre-strain, the maximum thermal response recovery rate of the VGCF/GO/EP composites was 57%, 158%, and 22% higher than that of the pristine EP, GO/EP composites and VGCF/EP composites, respectively. The synergistic effect of VGCF and GO significantly improves the output work of the EP films, and the VGCF/GO/EP composite films can easily lift 300 g weight under 30% pre-strain. Especially under 100 g load, the VGCF/GO/EP composite films can stably output up to 275 J·kg-1 work in heating and cooling cycle (40 °C-95 °C). Furthermore, the VGCF/GO/EP composite films and piezoelectric ceramic (PZTC) were combined to form a thermal energy collector, which realized the conversion from thermal energy to electrical energy. The thermal energy collectors can output 1.5 V peak voltage under the ambient temperature change of 40 °C-90 °C.

中文翻译：

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气相生长碳纤维/氧化石墨烯/环氧树脂形状记忆复合材料的热力学耦合行为和能量收集

摘要 形状记忆材料（SMM）的能量收集性能取决于SMM的回复率和回复力。在这项工作中，制备了形状记忆气相生长碳纤维/氧化石墨烯/环氧树脂（VGCF/GO/EP），并通过自制的评估装置分别研究了复合材料的热力学耦合行为和能量收集性能。实验结果表明，VGCF-GO填料的加入可以有效提高EP在拉伸阶段低于约10%应变的热响应恢复率。在 10% 的预应变下，VGCF/GO/EP 复合材料的最大热响应恢复率分别比原始 EP、GO/EP 复合材料和 VGCF/EP 复合材料高 57%、158% 和 22% . VGCF和GO的协同作用显着提高了EP薄膜的输出功，VGCF/GO/EP复合薄膜在30%的预应变下可以轻松举起300g的重量。特别是在100 g载荷下，VGCF/GO/EP复合薄膜在加热和冷却循环（40°C-95°C）下可稳定输出高达275 J·kg-1功。此外，VGCF/GO/EP复合薄膜和压电陶瓷（PZTC）结合形成热能收集器，实现了热能到电能的转换。热能收集器在40°C-90°C的环境温度变化下可输出1.5V峰值电压。VGCF/GO/EP复合薄膜在加热和冷却循环（40°C-95°C）下可稳定输出高达275 J·kg-1功。此外，VGCF/GO/EP复合薄膜和压电陶瓷（PZTC）结合形成热能收集器，实现了热能到电能的转换。热能收集器在40°C-90°C的环境温度变化下可输出1.5V峰值电压。VGCF/GO/EP复合薄膜在加热和冷却循环（40°C-95°C）下可稳定输出高达275 J·kg-1功。此外，VGCF/GO/EP复合薄膜和压电陶瓷（PZTC）结合形成热能收集器，实现了热能到电能的转换。热能收集器在40°C-90°C的环境温度变化下可输出1.5V峰值电压。