Oxidation of Different Microporous Carbons by Chemical and Electrochemical Methods

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/92610
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Title: Oxidation of Different Microporous Carbons by Chemical and Electrochemical Methods
Authors: Berenguer Betrián, Raúl | Morallon, Emilia
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Microporous carbons | Chemical oxidation | Electrochemical oxidation | Functionalization | Oxidation kinetics | Selectivity
Knowledge Area: Química Física
Issue Date: 4-Jun-2019
Publisher: Frontiers Media
Citation: Berenguer R and Morallón E (2019) Oxidation of Different Microporous Carbons by Chemical and Electrochemical Methods. Front. Mater. 6:130. doi: 10.3389/fmats.2019.00130
Abstract: The functionalization of high surface area microporous carbon materials by oxidative treatments receives great interest for multiple applications. The micropore structure of the material and the oxidation method could play an important role in the process. In this work, we analyze and compare the effects of liquid-phase chemical and alternative electrochemical oxidation treatments in the textural and chemical properties of four microporous carbon materials, namely a granular-, cloth-, and powder-like activated carbon (AC) and a powdery zeolite templated carbon (ZTC). Particularly, we provide new data on oxidation kinetics and changes on microporosity and surface chemistry of various microporous carbons. Characterization techniques reveal that the extent, textural changes, and selectivity of the oxidation greatly depend on the type of microporous material and the oxidation method. The incorporation of surface oxygen groups (SOGs) generally causes a more-or-less significant decrease in the measured micropore volume and the specific surface area. In the studied ACs, the extent of oxidation and BET surface area reduction augment with their micropore volume, and the textural changes seem to be governed by the micropore blockage by SOGs. The disordered microporous structure of these materials is then quite robust toward oxidation, but its heterogeneity may contribute to the lack of selectivity during this process. By contrast, the regular micropore framework of the ZTC is rapidly destroyed even under soft oxidizing conditions, but it is proposed to promote certain selectivity during oxidation. The high reactivity and structural fragility of ZTC are assigned to the weak interconnections and large number of exposed edge sites in its structure. Our results demonstrate the fast oxidation rate of chemical treatments under different conditions, especially in the case of ZTC, what is proposed to restrict the control and to limit the oxidizability and selectivity of these functionalization processes. Contrarily, the electrochemical treatments are proved to better control the kinetics of oxidative functionalization, what may explain the observed higher efficiency and selectivity for SOGs introduction and the minimization of degradation in fragile microporous structures.
Sponsor: Financial support from the Spanish Ministerio de Economía y Competitividad and FEDER funds (RYC-2017-23618, MAT2016-76595-R) is gratefully acknowledged.
URI: http://hdl.handle.net/10045/92610
ISSN: 2296-8016
DOI: 10.3389/fmats.2019.00130
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Berenguer and Morallón. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Peer Review: si
Publisher version: https://doi.org/10.3389/fmats.2019.00130
Appears in Collections:INV - GEPE - Artículos de Revistas

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