Geng Shiyu, Wei Jiayuan, Jonasson Simon, Hedlund Jonas, Oksman Kristiina
Division of Materials Science, Department of Engineering Sciences and Mathematics , Luleå University of Technology , SE-971 87 Luleå , Sweden.
Chemical Technology, Department of Civil, Environmental and Natural Resources Engineering , Luleå University of Technology , SE-97 187 Luleå , Sweden.
ACS Appl Mater Interfaces. 2020 Feb 12;12(6):7432-7441. doi: 10.1021/acsami.9b19955. Epub 2020 Jan 29.
In current times, CO capture and lightweight energy storage are receiving significant attention and will be vital functions in next-generation materials. Porous carbonaceous materials have great potential in these areas, whereas most of the developed carbon materials still have significant limitations, such as nonrenewable resources, complex and costly processing, or the absence of tailorable structure. In this study, a new strategy is developed for using the currently underutilized lignin and cellulose nanofibers, which can be extracted from renewable resources to produce high-performance multifunctional carbon aerogels with a tailorable, anisotropic pore structure. Both the macro- and microstructure of the carbon aerogels can be simultaneously controlled by carefully tuning the weight ratio of lignin to cellulose nanofibers in the precursors, which considerably influences their final porosity and surface area. The designed carbon aerogels demonstrate excellent performance in both CO capture and capacitive energy storage, and the best results exhibit a CO adsorption capacity of 5.23 mmol g at 273 K and 100 kPa and a specific electrical double-layer capacitance of 124 F g at a current density of 0.2 A g, indicating that they have great future potential in the relevant applications.
当前，二氧化碳捕获和轻质储能受到了广泛关注，并且将成为下一代材料的关键功能。多孔碳质材料在这些领域具有巨大潜力，然而，大多数已开发的碳材料仍存在显著局限性，例如不可再生资源、复杂且昂贵的加工过程，或者缺乏可定制的结构。在本研究中，开发了一种新策略，利用目前未充分利用的木质素和纤维素纳米纤维，它们可从可再生资源中提取，以制备具有可定制各向异性孔结构的高性能多功能碳气凝胶。通过仔细调节前驱体中木质素与纤维素纳米纤维的重量比，可同时控制碳气凝胶的宏观和微观结构，这对其最终孔隙率和表面积有很大影响。所设计的碳气凝胶在二氧化碳捕获和电容式储能方面均表现出优异性能，最佳结果显示在273 K和100 kPa下二氧化碳吸附容量为5.23 mmol g，在电流密度为0.2 A g时比双电层电容为124 F g，表明它们在相关应用中具有巨大的未来潜力。
