Yang Xiangyu, Li Shijie, Zhang Jin, Wang Xiaomin, Wang Yongzhen, Zhao Jianguo
College of Materials Science and Engineering, Taiyuan University of Technology, Yingze West Street, Taiyuan 030024, China.
Institute of Carbon Materials Science, Shanxi Datong University, Xingyun Street, Datong 037009, China.
Materials (Basel). 2021 Mar 16;14(6):1434. doi: 10.3390/ma14061434.
Designing and synthesizing photothermal conversion materials with better storage capacity, long-term stability as well as low temperature energy output capability is still a huge challenge in the area of photothermal storage. In this work, we report a brand new photothermal conversion material obtained by attaching trifluoromethylated azobenzene (Azo) to reduced graphene oxide (rGO). Azo-rGO exhibits outstanding heat storage density and power density up to 386.1 kJ·kg and 890.6 W·kg, respectively, with a long half-life (87.7 h) because of the H-bonds based on high attachment density. Azo-rGO also exhibits excellent cycling stability and is equipped with low-temperature energy output capability, which achieves the reversible cycle of photothermal conversion within a closed system. This novel Azo-rGO complex, which on the one hand exhibits remarkable energy storage performance as well as excellent storage life span, and on the other hand is equipped with the ability to release heat at low temperatures, shows broad prospects in the practical application of actual photothermal storage.
设计并合成具有更好存储容量、长期稳定性以及低温能量输出能力的光热转换材料，在光热存储领域仍然是一个巨大的挑战。在这项工作中，我们报道了一种全新的光热转换材料，它是通过将三氟甲基化偶氮苯（Azo）附着在还原氧化石墨烯（rGO）上而获得的。由于基于高附着密度的氢键作用，Azo-rGO分别表现出高达386.1 kJ·kg和890.6 W·kg的出色储热密度和功率密度，半衰期长达87.7小时。Azo-rGO还表现出优异的循环稳定性，并具备低温能量输出能力，可在封闭系统内实现光热转换的可逆循环。这种新型的Azo-rGO复合物一方面表现出卓越的储能性能以及出色的存储寿命，另一方面具备在低温下释放热量的能力，在实际光热存储的实际应用中展现出广阔前景。
