吉林大学陈龙团队开发了超亲水二维共价有机框架作为高效太阳能蒸汽发电的宽带吸收材料。相关研究成果于2022年3月2日发表在国际顶尖学术期刊《德国应用化学》。

多孔有机聚合物固有的疏水性和有限的光吸收，尤其是在近红外（NIR）区域，是阻碍其在太阳能蒸汽发电（SSG）中应用的两个瓶颈。

该文中，研究人员开发了一种基于1,4,5,8-四（苯氨基）蒽-9,10-二酮（TPAD）的COF（TPAD-COF），该COF具有超亲水性和广泛的光吸收，覆盖SSG的整个紫外可见到近红外区域。TPAD-COF是一种高效的光热转换材料，不含任何添加剂，具有1.42 kg m^-2 h^-1的良好水分蒸发性能，在1个标准太阳光照射下，能量转换效率高达94%。通过螯合BF2基团的后合成改性，进一步扩大了TPAD基COF的光吸收范围。系统的控制实验和分析证实，光热转换材料的亲水性在目前基于TPAD的SSG COFs中起着更为主导的作用。

附：英文原文

Title: Superhydrophilic 2D Covalent Organic Frameworks as Broadband Absorbers for Efficient Solar Steam Generation

Author: Xiaoli Yan, Shanzhi Lyu, Xiao-Qi Xu, Weiben Chen, Pengna Shang, Zongfan Yang, Guang Zhang, Weihua Chen, Yapei Wang, Long Chen

Issue&Volume: 2022-03-02

Abstract: The intrinsic hydrophobicity and limited light absorption especially in the near-infrared (NIR) region of porous organic polymers are two bottlenecks impeding their applications in solar steam generation (SSG). Herein, we develop a 1,4,5,8-tetrakis(phenylamino)anthracene-9,10-dione (TPAD)-based COF (TPAD-COF) featuring both superhydrophilicity and broad light absorption covering from the entire UV-vis to NIR regions for SSG. TPAD-COF serving as highly efficient photothermal conversion material without any additives displays an excellent water evaporation of 1.42 kg m  -2  h  -1  and achieves a high energy conversion efficiency of 94% under 1 sun irradiation. Futher extension of the light absorption range of TPAD-based COF is realized through post-synthetic modification by chelating BF  2  moieties. Systematical control experiments and analysis confirm that the hydrophilicity of photothermal conversion materials plays a more dominant role in the current TPAD-based COFs for SSG.

DOI: 10.1002/anie.202201900

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202201900