Li Xiaodie, Zhang Hao, Yang Xuran, Guo Xin, Yao Yiyuan, Xiao Chengming, Qi Junwen, Zhou Yujun, Yang Yue, Zhu Zhigao, Li Jiansheng
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt A):559-567. doi: 10.1016/j.jcis.2023.10.070. Epub 2023 Oct 17.
The onstruction of novel porous carbon materials for efficient desalination is crucial but remains challenging for capacitive deionization (CDI) development. Herein, a micelle-assisted strategy was raised to coat mesoporous polydopamine (mPDA) on the surface of two-dimensional (2D) leaf-like zeolitic imidazolate frameworks (ZIFL) followed by confinement pyrolysis. The introduction of the mPDA layer can not only mitigate the backbone collapse of ZIFL during pyrolysis to build a favorable porous environment for efficient ion transport and diffusion, but also induce explosive growth of carbon nanotubes (CNTs) to improve the electron conductivity. As expected, the derivative ZIFL@mPDA-C possessed a high desalination capacity of 41.9 mg g in 500 mg L NaCl solution at an operating voltage of 1.2 V. In particular, the retention ratio of the desalination capacity of ZIFL@mPDA-C was about 100 % after 50 consecutive adsorption-desorption cycles, while its leaf-like morphology and hierarchical pore structures were well preserved. This study highlights the importance of rationally designed structures and components for the performance breakthrough of carbon-based CDI electrode materials.
构建用于高效脱盐的新型多孔碳材料对于电容去离子化（CDI）的发展至关重要，但仍具有挑战性。在此，提出了一种胶束辅助策略，在二维（2D）叶状沸石咪唑酯骨架（ZIFL）表面包覆介孔聚多巴胺（mPDA），然后进行限域热解。mPDA层的引入不仅可以减轻热解过程中ZIFL的骨架坍塌，为高效离子传输和扩散构建良好的多孔环境，还可以诱导碳纳米管（CNT）的爆发式生长以提高电子导电性。正如预期的那样，衍生的ZIFL@mPDA-C在1.2 V的工作电压下，在500 mg L NaCl溶液中具有41.9 mg g的高脱盐容量。特别是，ZIFL@mPDA-C在连续50次吸附-解吸循环后，脱盐容量的保留率约为100%，同时其叶状形态和分级孔结构得到了很好的保留。这项研究突出了合理设计结构和组分对于碳基CDI电极材料性能突破的重要性。
