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Type |
Poster Presentation |
Area |
Inorganic Chemistry |
Room No. |
Event Hall |
Time |
4월 19일 (목요일) 11:00~12:30 |
Code |
INOR.P-70 |
Subject |
Highly activated and heteroatom-doped nanoporous carbon spheres for gas sorption and oxygen reduction reaction (ORR) applications |
Authors |
Hee Soo Kim, So Young Lim1, Hyuna Kyung1, Won Cheol Yoo* Department of Applied Chemistry, Hanyang University, Korea 1Department of Applied chemistry, Hanyang University, Korea |
Abstract |
Herein, we controlled the porosity (pore size distribution (PSD) and specific surface area (SSA)) and polarity (N-doping and Fe-N codoping) of various carbonaceous materials for CO2, CH4, and N2 adsorption and oxygen reduction reaction catalyst. Two different carbons (resorcinol-formaldehyde carbon (RFC) and highly N-doped melanin carbon (MC)) with different N-doping levels are utilized and further activated by CO2 treatment to closely control PSD and SSA. In case of CH4 adsorption, the accumulated ultramicropore (<0.7 nm or <1 nm) volume of both carbons is strongly correlated with CH4 adsorption regardless of surface polarity of carbons (R2=0.99 for CO2). This is probably due to the high polarizability and nonpolar nature CH4 (RFC_C60 and MC_C55). Especially, CO2 adsorption is affected by specific ultramicropore volume and chemisorption effect by nitrogen groups is also critical to CO2 sorption. Therefore, RFC_N10 (Post-synthetic treatment for N doping by NH3 activation) and MC_C65 showed higher CO2 adsorption capacity even though they had the almost same ultramicropore volume of RFC samples (RFC_N10 and MC_C65). In addition, these materials can be used as Fe-N-C catalyst support and metal free N-doped catalyst for ORR catalysts. The most active Fe–N–C (Fe–N–RFC_C240) and N-doped MC (MC_C125) with ultrahigh surface areas of 2913 and 2677 m2g-1 showed an excellent ORR activities with a favored four electron reduction pathway, long-term durability, and better methanol tolerance, comparable to a commercial Pt-based catalyst.
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E-mail |
catacylsm@naver.com |
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