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Title: Identify the Removable Substructure in Carbon Activation

Abstract

Activated carbon plays a pivotal role in achieving critical functions, such as separation, catalysis, and energy storage. A remaining question of carbon activation is which substructures in amorphous carbon are preferentially removed during activation. Herein, we report the first structure–activation correlation elucidated on the basis of unprecedented comprehensive characterization on carbon activation. We discover that activation under CO2 preferentially removes graphenic layers that are more defective. Therefore, the resulting activated carbon contains thinned turbostratic nanodomains that are of a higher local graphenic order. The mechanistic insights explain why more defective soft carbon is “burned” under CO2 at a much faster rate than hard carbon. The mechanism leads to an activation-based design principle of mesoporous carbon. Guided by this principle, a bimodal micromesoporous carbon is prepared simply by CO2 activation. Our findings may cause a paradigm shift for the rational design of nanoporous carbon.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); National Science Foundation (NSF)
OSTI Identifier:
1530180
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 17
Country of Publication:
United States
Language:
English

Citation Formats

Xing, Zhenyu, Qi, Yitong, Tian, Ziqi, Xu, Jing, Bommier, Clement, Lu, Jun, Tong, Wei, Jiang, De-en, and Ji, Xiulei. Identify the Removable Substructure in Carbon Activation. United States: N. p., 2017. Web. doi:10.1021/acs.chemmater.7b01937.
Xing, Zhenyu, Qi, Yitong, Tian, Ziqi, Xu, Jing, Bommier, Clement, Lu, Jun, Tong, Wei, Jiang, De-en, & Ji, Xiulei. Identify the Removable Substructure in Carbon Activation. United States. doi:10.1021/acs.chemmater.7b01937.
Xing, Zhenyu, Qi, Yitong, Tian, Ziqi, Xu, Jing, Bommier, Clement, Lu, Jun, Tong, Wei, Jiang, De-en, and Ji, Xiulei. Tue . "Identify the Removable Substructure in Carbon Activation". United States. doi:10.1021/acs.chemmater.7b01937.
@article{osti_1530180,
title = {Identify the Removable Substructure in Carbon Activation},
author = {Xing, Zhenyu and Qi, Yitong and Tian, Ziqi and Xu, Jing and Bommier, Clement and Lu, Jun and Tong, Wei and Jiang, De-en and Ji, Xiulei},
abstractNote = {Activated carbon plays a pivotal role in achieving critical functions, such as separation, catalysis, and energy storage. A remaining question of carbon activation is which substructures in amorphous carbon are preferentially removed during activation. Herein, we report the first structure–activation correlation elucidated on the basis of unprecedented comprehensive characterization on carbon activation. We discover that activation under CO2 preferentially removes graphenic layers that are more defective. Therefore, the resulting activated carbon contains thinned turbostratic nanodomains that are of a higher local graphenic order. The mechanistic insights explain why more defective soft carbon is “burned” under CO2 at a much faster rate than hard carbon. The mechanism leads to an activation-based design principle of mesoporous carbon. Guided by this principle, a bimodal micromesoporous carbon is prepared simply by CO2 activation. Our findings may cause a paradigm shift for the rational design of nanoporous carbon.},
doi = {10.1021/acs.chemmater.7b01937},
journal = {Chemistry of Materials},
number = 17,
volume = 29,
place = {United States},
year = {2017},
month = {9}
}