Carbon aerogels with integrated engineered macroporous architectures for improved mass transport. (July 2021)

• Record Type: Journal Article
• Authors: Chandrasekaran, Swetha; Forien, Jean-Baptiste; Campbell, Patrick G.; Oakdale, James S.; Mancini, Julie A.; Worsley, Marcus A.; Biener, Juergen
• Is Part Of: Carbon. Volume 179(2021)
• Page Start: 125
• Page End: 132
• Publication Date: 2021-07
• Subjects: Hierarchical porous carbon -- Carbon aerogels -- Templating -- Three-dimensional printing -- Mass transport; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.04.017
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Carbon aerogels (CAs) combine unique properties including ultra-high surface area, high electrical conductivity, corrosion resistance, and robust mechanical properties making them ideal materials for electrochemical applications. Traditional CA synthesis results in isotropic, random nanoporous networks that work well for applications relying on diffusional mass transport. However, many applications would benefit from integration of engineered macroporous network structures that enable directed pressure-gradient-driven mass transport. Here, we report on using 3D-printed sacrificial polymeric templates to generate templated CAs (t-CAs) with integrated engineered nonrandom macroporous network structures. Specifically, we used projection micro-stereo-lithography (PμSL) and two-photon polymerization direct laser writing (2PP-DLW) to fabricate millimeter-to-centimeter-sized 3D sacrificial polymeric templates with features ranging from tens of microns (PμSL) to 100s of nanometers (2PP-DLW). T-CAs were fabricated by infiltrating the templates with resorcinol-formaldehyde (RF) precursor solution, followed by carbonization at 1050 °C to simultaneously convert the RF gel to a CA and decompose the 3D-printed template, leaving an embedded templated macroporous network structure behind. X-ray computer tomography confirms integration of the macroporous architecture defined by the template. The templated macroporous architecture improves mass transport in t-CAs compared to traditional bulk CA as demonstrated by more uniform activation and their response in electrochemical cyclic voltammetry and galvanostatic charge-discharge tests. Graphical abstract: Image 1 Highlights: Fabrication of carbon aerogels with engineered nonrandom macropore networks. Using 3D printed sacrificial polymeric templates as molds for carbon aerogels. Integrated macroporosity improves energy storage performance of carbon aerogels. Integrated macropores enable more uniform activation of carbon aerogels. Integration of macroporosity designed for pressure driven mass transport.