Nanoclay assisted electrochemical exfoliation of pencil core to high conductive graphene thin-film electrode

详细信息    查看全文

• 作者：Kunfeng Chen^a ; Dongfeng Xue^a ; ^{dongfeng@ciac.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Sridhar Komarneni^b ; ^{komarneni@psu.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Graphene colloid ; Electrochemical exfoliation ; High conductive ; Energy storage ; Electrode materials ; Pencil
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：487
• 期：Complete
• 页码：156-161
• 全文大小：1761 K

文摘

Nanoclay assisted electrochemical exfoliation was developed to in-situ form functionalized graphene electrode materials from pencil core with different ratios of graphite and clay. This method made a positive transformation from solid graphite to graphene colloidal solution, which can be used to construct binder- and additive-free thin-film electrodes. Exfoliated graphene can be served as both conductive current collector (film resistance of 33 Ω/square) and electrode materials. Graphene thin-film electrodes from pencil cores displayed higher capacity of 224 than 80 mA h/g of that from pure graphite. The electrochemical performance can be controlled by the ratio of graphite and clay and the oxidation reaction of surface oxygen functional groups. The described nanoclay-assisted electrochemical oxidation route shows great potential for the synthesis of functionalized graphene electrode materials for high-conductive thin-film lithium ion batteries and supercapacitors.