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Individual Nanoporous Carbon Spheres with High Nitrogen Content from Polyacrylonitrile Nanoparticles with Sacrificial Protective Layers
journal contribution
posted on 2017-10-17, 12:05 authored by Jianan Zhang, Rui Yuan, Sittichai Natesakhawat, Zongyu Wang, Yepin Zhao, Jiajun Yan, Siyuan Liu, Jaejun Lee, Danli Luo, Eric Gottlieb, Tomasz Kowalewski, Michael R. Bockstaller, Krzysztof MatyjaszewskiFunctional
nanoporous carbon spheres (NPC-S) are important for
applications ranging from adsorption, catalysis, separation to energy
storage, and biomedicine. The development of effective NPC-S materials
has been hindered by the fusion of particles during the pyrolytic
process that results in agglomerated materials with reduced activity.
Herein, we present a process that enables the scalable synthesis of
dispersed NPC-S materials by coating sacrificial protective layers
around polyacrylonitrile nanoparticles (PAN NPs) to prevent interparticle
cross-linking during carbonization. In a first step, PAN NPs are synthesized
using miniemulsion polymerization, followed by grafting of 3-(triethoxysilyl)propyl
methacrylate (TESPMA) to form well-defined core–shell structured
PAN@PTESPMA nanospheres. The cross-linked PTESPMA brush layer suppresses
cross-linking reactions during carbonization. Uniform NPC-S exhibiting
diameters of ∼100 nm, with relatively high accessible surface
area (∼424 m2/g), and high nitrogen content (14.8
wt %) was obtained. When compared to a regular nanoporous carbon monolith
(NPC-M), the nitrogen-doped NPC-S demonstrated better performance
for CO2 capture with a higher CO2/N2 selectivity, an increased efficiency in catalytic oxygen reduction
reactions, as well as improved electrochemical capacitive behavior.
This miniemulsion polymerization-based strategy for the preparation
of functional PAN NPs provides a new, facile approach to prepare high-performance
porous carbon spheres for diverse applications.
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Individual Nanoporous Carbon Spheresoxygen reduction reactionsNPC-Mnanoporous carbon monolithelectrochemical capacitive behaviorcarbonizationcross-linked PTESPMA brush layercross-linkingCOPAN NPsapplicationNPC-S materialsLayers Functional nanoporous carbon spheresminiemulsion polymerization-based strategy
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