Preparation of Activated Ordered Mesoporous Carbons with a Channel Structure

Abstract

Activated ordered mesoporous carbons with a channel structure (AOMCs-CS) were successfully prepared by imposing CO(2) activation on ordered mesopore carbon C-FDU-15. It is found that the continuous carbon framework of the precursor C-FDU-15 plays an important role in keeping the order structure of the resulting AOMCs-CS. The mild activation (e.g., 31 wt % burnoff) does not impair the order degree. After that, the order degree gradually decreases with further increasing burnoff. However, the basic hexagonal mesostructure of C-FDU-15 can still be found in the AOMCs-CS when the burnoff is up to 73 wt %, although many carbon walls are punched and thus many larger mesopores and marcropores are generated. With increasing burnoff, the surface area and volume of micropores increase first and then decrease, and the surface area and volume of mesopores continuously increase. The highest measured Brunaruer-Emmett-Teller (BET) surface area, micropore volume, and total pore volume of the AOMCs-CS reach 2004 m(2)/g, 0.50 cm(3)/g, and 1.22 cm(3)/g, respectively.

Development of Microporosity in Mesoporous Carbons

“…The same was recently reported for mesoporous carbons fabricated by using colloidal silica as a hard template [18]. Also, the soft-templated mesoporous carbons were activated by KOH [42][43][44] and CO 2 [45,46]. Especially, our previous contribution [42] was focused on the creation of microporosity without deteriorating the mesoporous structure.…”

“…Especially, our previous contribution [42] was focused on the creation of microporosity without deteriorating the mesoporous structure. The aforementioned works [37][38][39][40][41][42][43][44][45][46] show that both CO 2 and KOH activations can be used to create effectively microporosity in the HT and ST mesoporous carbons.…”

Catalytic methane decomposition over activated carbons prepared from direct coal liquefaction residue by KOH activation with addition of SiO 2 or SBA-15

“…All the isotherms are characterized by a hysteresis loop, proving the presence of the slitshaped pores, typical of a lot of ACs [21]. The occurrence of hysteresis loop is also a proof of a certain contribution of mesopores to the total porosity of the carbons [22]. The pore size distribution of R(KOH) was bimodal with peaks at about 5.2 nm and 18 nm in Fig.…”

N‐doping Hierarchical Porosity Carbon from Biowaste for High‐Rate Supercapacitive Application

“…The micro‐pores contribute to the enhancement of specific surface area to store more energy. Meso‐pores mainly supply favorable shortcuts for electrolyte penetration to facilitate swift ion diffusion ,,,. Another protocol to improve the electrochemical performance of electrodes is the incorporation of nitrogen‐containing functional groups, which can induce pseudo‐capacitance and also improve the electrical conductivity.…”