Park Junbeom, Kretzschmar Ansgar, Selmert Victor, Camara Osmane, Kungl Hans, Tempel Hermann, Basak Shibabrata, Eichel Rüdiger A
Institute of Energy and Climate Research - Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
ACS Appl Mater Interfaces. 2021 Oct 6;13(39):46665-46670. doi: 10.1021/acsami.1c13541. Epub 2021 Sep 21.
Polyacrylonitrile-based carbon nanofibers (PAN-based CNFs) have great potential to be used for carbon dioxide (CO) capture due to their excellent CO adsorption properties. The porous structure of PAN-based CNFs originates from their turbostratic structure, which is composed of numerous disordered stacks of graphitic layers. During the carbonization process, the internal structure is arranged toward the ordered graphitic structure, which significantly influences the gas adsorption properties of PAN-based CNFs. However, the relation between structural transformation and CO capture is still not clear enough to tune the PAN-based CNFs. In this paper, we show that, with increasing carbonization temperature, the arrangement of the PAN-based CNF's structure along the stack and lateral directions takes place independently: gradually aligning and merging along the stack direction and enlarging along the lateral direction. Further, we correlate the structural arrangement and the CO adsorption properties of the PAN-based CNFs to propose a comprehensive structural mechanism. This mechanism provides the knowledge to understand and tailor the gas adsorption properties of PAN-based CNFs.
基于聚丙烯腈的碳纳米纤维（PAN基CNF）因其优异的CO吸附性能而具有用于二氧化碳（CO₂）捕获的巨大潜力。PAN基CNF的多孔结构源于其 turbostratic结构，该结构由大量无序堆叠的石墨层组成。在碳化过程中，内部结构朝着有序的石墨结构排列，这对PAN基CNF的气体吸附性能有显著影响。然而，结构转变与CO₂捕获之间的关系仍不够清晰，无法对PAN基CNF进行调控。在本文中，我们表明，随着碳化温度的升高，PAN基CNF结构沿堆叠方向和横向的排列是独立发生的：沿堆叠方向逐渐排列和合并，沿横向扩大。此外，我们将PAN基CNF的结构排列与CO₂吸附性能相关联，提出了一种全面的结构机制。该机制为理解和定制PAN基CNF的气体吸附性能提供了知识。
