Mesoporous carbon derived from pyrolysis of metal-organic frameworks (MOFs) is advantageous owing to its high specific surface area, large pore volume, and versatility in both structure and composition. Heteroatom doping on mesoporous carbon by synthesizing with heteroatom containing ligands (pre-synthetic process) or incorporating heteroatom-containing compounds during pyrolysis (post-doping) can further enhance its electrochemical properties. Although both methods have been applied to increase the doping content, the effects of the pre-synthetic process and post-doping have not yet been systematically studied. Herein, we have synthesized mesoporous carbon derived from sulfur-containing MOFs for the first time using 2,5-disulfanylterephthalic acid as a ligand and added dopants (melamine for N-doping and thiourea for N,S-codoping). We systematically compared the performance of mesoporous carbon as cathodes for the oxygen reduction reaction (ORR) and lithium-sulfur (Li-S) batteries with previous studies, which used terephthalic acid and its analogues as pre-synthetic ligands and various dopants as post-doping sources. Our work showed the synergetic effect of heteroatoms from dual-doping process - especially sulfur (S from pre-synthetic process and N,S from post-doping), which not only enhanced catalytic activity (limiting current density (JL) of -5.19 mA·cm-2), stability, and methanol tolerance as an ORR catalyst but also rendered superior stability of 85.2% over 100 cycles as a cathode of Li-S batteries.
|Number of pages||12|
|Journal||ACS Sustainable Chemistry and Engineering|
|Publication status||Published - 2020 Jun 15|
Bibliographical noteFunding Information:
This research was supported by the MSIT (Ministry of Science and ICT), Korea, under the “ICT Consilience Creative Program” (IITP-2019-2017-0-01015) supervised by the IITP (Institute for Information & communications Technology Planning & Evaluation), and also by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2019R1A2C4069922) grant funded by the Korea government (MEST). This research is also supported by the “LG Research Fund for New Faculty” by LG Chem. We would like to express a great appreciation to Dr. Myeong Jun Song and Dr. Il To Kim for their valuable and constructive suggestions during the planning and development of this work.
© 2020 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment