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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Template dissolution with NaOH–HCl in synthesis of zeolite-templated carbons: Effects on oxygen functionalization and electrical energy storage characteristics

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Title
Template dissolution with NaOH–HCl in synthesis of zeolite-templated carbons: Effects on oxygen functionalization and electrical energy storage characteristics
Author(s)
Hongjun Park; Steven K. Terhorst; Raj Kumar Bera; Ryong Ryoo
Publication Date
2019-12
Journal
CARBON, v.155, no., pp.570 - 579
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
© 2019 Elsevier LtdZeolite-templated synthesis is a versatile route to ordered microporous carbons built with single-walled sp2 framework of various structures, but the use of hazardous HF to dissolve the zeolite template is still a critical safety issue. We investigated the template-removal process using NaOH and HCl, which are safer than HF. The results indicated that the residual ash content in the carbon could be lowered to less than 5 wt% when the template was removed by consecutive treatments using NaOH and HCl in a proper sequence depending on the zeolite framework type. The carbon obtained in this manner exhibited a rather increased supercapacitance in aqueous media at high current density, as compared to carbons from HF-washing. In the case of the non-aqueous supercapacitor, however, the washing with NaOH–HCl resulted in low capacitance. This was due to the effect of NaOH to generate oxygen-functional groups, which could lead to an increase in the hydrophilicity, and a decrease in the electrical conductivity. Furthermore, the oxygen-functional groups could serve as a base to graft organic amines. When the carbon was heated in H2, the oxygen content decreased to a similar level to that of the HF-washed carbon, restoring the conductivity and electrochemical energy storage characteristics
URI
https://pr.ibs.re.kr/handle/8788114/6701
ISSN
0008-6223
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
Carbon 155 (2019) 570-579.pdfDownload

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