Regulating Oxygen Configuration in Hierarchically Porous Carbon Nanosheets for High-Rate and Durable Na + Storage.

Autor: Wang L; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China., Cen M; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China., El-Khodary SA; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China., Ramachandran K; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China., Huang J; Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 211800, Nanjing, China., Cui Y; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China., Ng DHL; School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen), 518172 Longgang, Shenzhen, China., Wang C; Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 211800, Nanjing, China., Lian J; Institute for Energy Research, Jiangsu University, 212013, Zhenjiang, China.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2022 Dec 06; Vol. 28 (68), pp. e202202358. Date of Electronic Publication: 2022 Oct 10.
DOI: 10.1002/chem.202202358
Abstrakt: Surface oxygen functionalities (particularly C-O configuration) in carbon materials have negative influence on their electrical conductivity and Na + storage performance. Herein, we propose a concept from surface chemistry to regulate the oxygen configuration in hierarchically porous carbon nanosheets (HPCNS). It is demonstrated that the C-O/C=O ratio in HPCNS reduces from 1.49 to 0.43 and its graphitization degree increases by increasing the carbonization temperature under a reduction atmosphere. Remarkably, such high graphitization degree and low C-O content of the HPCNS-800 are favorable for promoting its electron/ion transfer kinetics, thus endowing it with high-rate (323.6 mAh g -1 at 0.05 A g -1 and 138.5 mAh g -1 at 20.0 A g -1 ) and durable (96 % capacity retention over 5700 cycles at 10.0 A g -1 ) Na + storage performance. This work permits the optimization of heteroatom configurations in carbon for superior Na + storage.
(© 2022 Wiley-VCH GmbH.)
Databáze: MEDLINE
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