title: Nanoclay assisted electrochemical exfoliation of pencil core to high conductive graphene thin-film electrode.
abstract: 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 33Ω/square) and electrode materials. Graphene thin-film electrodes from pencil cores displayed higher capacity of 224 than 80mAh/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.
authors: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors: Kunfeng
authors: K
authors: Chen
authors: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. Electronic address: dongfeng@ciac.ac.cn.
authors: Dongfeng
authors: D
authors: Xue
authors: Materials Research Institute, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, United States. Electronic address: komarneni@psu.edu.
authors: Sridhar
authors: S
authors: Komarneni
keywords: Electrochemical exfoliation; Electrode materials; Energy storage; Graphene colloid; High conductive; Pencil