Pore Formation Mechanism of Nanoporous Glassy Carbon and " Shell-core " Structure

As the first-selected electrode material for supercapacitors, activated carbon should possess high specific surface area, high conductivity and density which are difficult to be provided by the same kind of carbon material. A nanoporous glassy carbon (NPGC)electrode slice with monolithic nano-open porous structure and excellent capacitance properties was made. The properties of NPGCs completely exceeded that of carbon aerogels, and pore-forming mechanism of NPGCs was investigated. Results show that a shell and core structure is formed in cured resin particles due to different cross-linkage degrees in inside and outside layers of cured resins by adding an amount of curing agent-hexamine, mill-mixing and adjusting the curing temperature. When crushed and compacted, cured resin can be compacted into a slice due to the adhesive effect of core and core is prevented from fusion to become GC due to non-fusion of shell in carbonization. Then, an abundant of open pores is formed inside and outside carbon particles through which activation agent gases can diffuse into the internal parts of the matrix and the nanoporous glassy carbon is obtained.