High micropore number and specific surface of carbon fibers pretreated with a swarm of CO2 micro–nanobubbles
2021
Lee, Joon Hyuk | Yi, Sun-hong | Suh, Dong Hack
Carbon materials are of fundamental importance in the fields of energy, electronics, and the environment. Using petroleum pitch has been proposed as a sustainable method to fabricate carbon fibers, yet the process requires further advancements due to an decrease in pores during post-treatment. Here we hypothesized that dissolving micro–nanobubbles of CO₂ in a pretreatment should favor the pore growth of carbon fibers during activation. Results show that when a swarm of CO₂ micro–nanobubbles is employed as the sacrificial catalyst, the samples display a specific surface of up to 792 m² g⁻¹. The high density of the CO₂ dissociated products caused the sample to include 70.71% micropores, thereby producing a disordered etching texture. The chemical state of the elements revealed that there were no marked impurities. This study provides a new strategy for the development of highly porous materials, that may possibly stimulate more research on advanced performance adsorbents or electrode materials.
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