近日，天津大学封伟教授等人在Science China Materials发表研究论文，将大体积的偶氮苯衍生物4’-氨基偶氮苯-4-磺酸（AABS）接枝到ZIF-90表面，制备出一种具有光热转换效应的金属有机框架材料ZIF-90-AABS（ZIF-AABS）。
本文要点
1) ZIF-AABS表面类模板化效应允许AABS分子发生可逆的顺反异构化转变，从而可实现5.1 J g−1的光化学储能。此外，由于AABS主要接枝在ZIF-90表面，ZIF-AABS保留了ZIF-90的晶体结构，因此仍具备封装和吸附相变材料（PCM）的能力。
2) 通过在孔隙结构中渗入十八醇（OD），成功制备了复合相变材料OD/ZIF-AABS，从而有效地实现了相变储能。在最大的OD负载下，OD/ZIF-AABS的潜热储能达到121.3 J g−1，且经过50次熔融/固化循环后潜热性能无明显衰减。
这项工作进一步拓展了偶氮苯的应用范围，促进了基于MOFs的复合材料在光热储能领域的发展。
Figure 1. Energy storage mechanism and isomerization behavior of ZIF-AABS.
Figure 2. (a) FTIR spectra of ZIF-90 and ZIF-AABS. (b) XRD patterns of the ZIF-90 and ZIF-AABS. (c, d) XPS C 1s spectra of ZIF-90 and ZIF-AABS, respectively. (e, f) XPS N 1s spectra of ZIF-90 and ZIF-AABS, respectively. (g, h) The SEM images of ZIF-90 and ZIF-AABS. (i, j) The TEM images of ZIF-90 and ZIF-AABS, respectively.
Figure 3. (a) B3LYP/6-31G geometry optimization results on trans- and cis- AABS in vacuum and the ΔHISO obtained by calculation. (b) UV-Vis absorption spectra of ZIF-90 and ZIF-AABS dispersed in DMF. Changes in UV-Vis absorption spectra of ZIF-AABS (c) under 365 nm UV light excitation, and (d) after 5 min of UV light exposure in darkness. (e) Photochemical isomerization cycling stability of ZIF-AABS under UV excitation and in the dark. (f) First-order cis to trans isomerization rate constants of ZIF-AABS in darkness at room temperature. (g) TGA curve of ZIF-90 and ZIF-AABS. (h) DSC curves of ZIF-AABS measured at 5°C min−1.
Figure 4. (a) FTIR spectra and (b) XRD patterns of OD/ZIF-AABS. (c) SEM image of 80OD/ZIF-AABS. (d, e) Melting/solidifying curves of OD/ZIF-AABS. (f) Phase change enthalpies of OD/ZIF-AABS. (g) Leakage Assessment of OD/ZIF-AABS.
Kai Wang (王凯) is a MS student guided by Prof. Wei Feng at the School of Materials Science and Engineering, Tianjin University. His research interests include the synthesis, mechanism and application of azobenzene-based photoresponsive materials.
Wei Feng (封伟) is a professor at the School of Materials Science and Engineering, Tianjin University. He obtained his PhD degree from Xi’an Jiaotong University (China) in 2000. Then, he worked at Osaka University and Tsinghua University as a Japan Society for the Promotion of Science (JSPS) fellow and postdoctoral researcher, respectively. In 2004, he became a full professor at Tianjin University. His research interests include photoresponsive organic molecules and their derivatives, thermal conductive and high-strength carbon-based composites, and new fluorinated carbon materials and functional polymers.
文章信息
Kai Wang, Mengmeng Qin, Can Chen, Shuo Wang, Wei Feng. Metal organic frameworks with surface-grafted azobenzene for energy storage. Sci. China Mater. (2025).
