119th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Material Chemists
Room No. 402호
Time THU 09:50-:
Code MAT.O-6
Subject Hierarchically N-doped porous carbon nanofibers derived from crab shell: Application for CO2 adsorption and Metal oxide@Carbon supercapacitors
Authors 김희수, 김동관, 정희승, 유원철*
한양대학교 응용화학과, Korea
Abstract Crab shell, a plentiful food waste and high volume organic resource, has been used to synthesize nitrogen and oxygen doped activated porous carbon. Crab shell (CS) that consists of chitin materials with CaCO3 and MgCO3 is changed to organic nanofibers using acid (HCl) treatment for removal CaCO3 and MgCO3. And these organic nanofibers were used to prepare micro- mesoporous crab shell derived carbon nanofibers (CSCNs) by a two-step carbonization, and subsequent CO2 activation process was performed to fine-tune specific surface area (SSA) and pore size distribution (PSD), denoted as CSCN_CXX, XX stands for the treatment time. The activated porous carbon shows high SSA of 2430 m2 g-1 and a large pore volume of 1.21 cm3 g-1 and high N-doping levels of 4.6 wt%. As a CO2 adsorbent, the porous carbon has good CO2 adsorption capacities (6.09 mmol g-1 at 273K and 3.72 mmol g-1 at 298K under 1bar) and a good CO2/N2 selectivity (33.6@298K), which is calculated from the single-component adsorption isotherms based on the ideal adsorption solution theory (IAST) method. As an electrode material, the porous carbon exhibits good electrochemial performance in 6M KOH aqueous electrolyte, with the specific capacitance of 220 F g-1 at a discharge current density of 1 A g-1 and prominent cycling stability (80%) for over 10000 cycles (current density at 2 Ag-1) . In addition, highly N-doped hierarchical CSNCs are used as hybrid supercapacitors decorated with Fe2O3 and CO3O4 metal oxide nanoparticles (Fe2O3@CSCN, Co3O4@CSCN). Fe2O3@CSCN and Co3O4@CSCN composites show outstanding capacitances of 291 Fg-1 and 508 Fg-1 at 1 Ag-1, excellent retention of 183 Fg-1 (63%) and 374 Fg-1 (74%) at 50 Ag-1. And these hybrid materials also show outstanding long-term cycling stabilities of 253 Fg-1 (91%) and 470 Fg-1 (95%) at 2 Ag-1 over 10000 cycles. This works shows a good instance for taking advantage of recycling food garbage and proving applications in energy storage materials and CO2 gas sorbents.
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