Abstract
Recently, phenolic resin has been a promising precursor to synthesize electrospun carbon ultrafine fibers with well-controlled pore structure favorable for CO2 capture. We report the facile and large-scale preparation of freestanding microporous carbon ultrafine fibers from resole-type phenolic resin by electrospinning and following one-step carbonization, and investigate for the first time their CO2 adsorption performance at ambient temperature. The obtained samples were characterized by scanning electron microscopy, Raman spectra, X-ray photoelectron spectroscopy and N2 adsorption. Small average diameter of 820nm, high specific surface area (650m2g−1) and narrow micropore size distribution are associated with the prepared fibers. Remarkably, the ultrafine fibers possess much more ultra-small micropores (0.50–0.63nm) than common polyacrylonitrile-based activated carbon nanofibers and commercial porous carbon samples. With such well-designed structure, the resultant fibers show outstanding CO2 equilibrium adsorption capacities and good reversibility. At 25°C, the stable capture capacity of the fiber is 2.92mmolg−1 at 1bar and 0.44mmolg−1 at 40mbar, which offers great potentials for CO2 capture and storage.
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