快速微波还原电化学衍生氧化石墨烯制备高结晶石墨烯膜  

Rapid microwave reduction of electrochemically-derived graphene oxide for high-crystalline graphene membranes

作　　者：熊志远 于沛 梁庆华 李丹 Zhiyuan Xiong;Pei Yu;Qinghua Liang;Dan Li(School of Light Industry and Engineering,South China University of Technology,Guangzhou 510614,China;Department of Chemical Engineering,The University of Melbourne,Parkville,Victoria 3010,Australia;Department of Materials Science and Engineering,Monash University,Clayton,Victoria 3800,Australia;Key Laboratory of Rare Earth,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China)

机构地区：[1]School of Light Industry and Engineering,South China University of Technology,Guangzhou 510614,China [2]Department of Chemical Engineering,The University of Melbourne,Parkville,Victoria 3010,Australia [3]Department of Materials Science and Engineering,Monash University,Clayton,Victoria 3800,Australia [4]Key Laboratory of Rare Earth,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China

出　　处：《Science China Materials》2023年第12期4733-4741,共9页中国科学（材料科学）（英文版）

基　　金：supported by Australian Research Council (FL180100029, DP220103498, and DE190100445);the financial support from the South China University of Technology;the financial support from the Chinese Academy of Sciences (CAS) and Ganjiang Innovation Academy, CAS

摘　　要：电化学氧化石墨,可用于大规模合成氧化石墨烯,是一种可持续且直接的方法.然而,关于电化学衍生氧化石墨烯(EGO)进一步还原的研究却很缺少.本文中,我们报道了EGO膜的快速微波还原过程.化学法合成的氧化石墨烯膜需要数分钟微波辐射才能被还原,但是我们制备的EGO膜经3秒微波辐射即可转化为高结晶石墨烯膜(HCGM),并且该过程无需对膜进行预处理或添加微波增敏剂.与以前报道的微波法制备的石墨烯相比,本文制备的HCGM具有大尺寸芳香区(约100 nm)、高碳/氧原子比(约33)和高电导率(约5×10^(4)S m^(−1)).EGO的高微波还原效率可以归因于其独特分子结构,EGO中丰富的芳香区可高效吸收微波,引发EGO膜实现瞬时体相加热.该研究加深了对氧化石墨烯微波还原机理的理解,并为HCGM的生产提供了一条便捷途径.Electrochemical oxidation of graphite has emerged as a sustainable and straightforward approach for the scalable synthesis of graphene oxide(GO).However,the reduction of electrochemically-derived GO(EGO)has received limited attention.Here,we present a rapid microwave reduction process specifically tailored for EGO,which exhibits distinct properties compared with chemically-derived GO(CGO).Unlike CGO membranes that require several minutes of microwave irradiation for reduction,EGO membranes can be transformed into high-crystalline graphene membranes(HCGM)in just 3 s,without pre-treatment or additional triggers.The resulting HCGM displays a significant aromatic domain size(~100 nm),a high C/O atomic ratio(~33),and impressive electrical conductivity(~5×10^(4)S m^(−1)),surpassing previously reported microwave-reduced graphene.The remarkable efficiency of microwave reduction can be attributed to the unique molecular structure of EGO with abundant aromatic domains which enable efficient microwave absorption,inducing transient volumetric heating of EGO membranes.This study provides mechanistic insights into the microwave reduction process of GO and offers a facile and scalable pathway for HCGM production.

关 键 词：graphene oxide graphene membrane electrochemical oxidation high crystallinity microwave reduction 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TQ127.11[化学工程—无机化工]