CAS Key Lab of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210, China.
School of Physical Science and Technology, ShanghaiTech University , Shanghai 201210, China.
ACS Appl Mater Interfaces. 2018 Jan 31;10(4):3495-3505. doi: 10.1021/acsami.7b14418. Epub 2018 Jan 19.
Carbons are considered less favorable for postcombustion CO capture because of their low affinity toward CO, and nitrogen doping was widely studied to enhance CO adsorption, but the results are still unsatisfactory. Herein, we report a simple, scalable, and controllable strategy of tethering potassium to a carbon matrix, which can enhance carbon-CO interaction effectively, and a remarkable working capacity of ca. 4.5 wt % under flue gas conditions was achieved, which is among the highest for carbon-based materials. More interestingly, a high CO/N selectivity of 404 was obtained. Density functional theory calculations evidenced that the introduced potassium carboxylate moieties are responsible for such excellent performances. We also show the effectiveness of this strategy to be universal, and thus, cheaper precursors can be used, holding great promise for low-cost carbon capture from flue gas.
碳因对 CO 的亲和力低而被认为不利于燃烧后 CO 捕获，因此广泛研究了氮掺杂以增强 CO 吸附，但结果仍不尽如人意。在此，我们报告了一种简单、可扩展且可控的将钾键合到碳基质上的策略，该策略可有效增强碳与 CO 的相互作用，在烟道气条件下实现了约 4.5wt%的显著工作容量，这在基于碳的材料中是最高的之一。更有趣的是，获得了高达 404 的高 CO/N 选择性。密度泛函理论计算证明，引入的钾羧酸酯基团是优异性能的原因。我们还表明，这种策略的有效性是普遍的，因此可以使用更便宜的前体，为从烟道气中低成本捕获 CO 提供了很大的希望。
