Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts

被引:1156
作者
Parvez, Khaled [1 ]
Wu, Zhong-Shuai [1 ]
Li, Rongjin [1 ]
Liu, Xianjie [2 ]
Graf, Robert [1 ]
Feng, Xinliang [1 ,3 ]
Muellen, Klaus [1 ]
机构
[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[2] Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden
[3] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China
关键词
FLEXIBLE SUPERCAPACITORS; CARBON NANOTUBES; FILMS; OXIDE; ELECTRODES; TRANSPARENT; SHEETS; FLAKES; CELLS; LAYER;
D O I
10.1021/ja5017156
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mass production of high-quality graphene sheets is essential for their practical application in electronics, optoelectronics, composite materials, and energy-storage devices. Here we report a prompt electrochemical exfoliation of graphene sheets into aqueous solutions of different inorganic salts ((NH4)(2)SO4, Na2SO4, K2SO4, etc.). Exfoliation in these electrolytes leads to graphene with a high yield (>85%, <= 3 layers), large lateral size (up to 44 mu m), low oxidation degree (a C/O ratio of 17.2), and a remarkable hole mobility of 310 cm(2) V-1 s(-1). Further, highly conductive graphene films (11 Omega sq(-1)) are readily fabricated on an A4-size paper by applying brush painting of a concentrated graphene ink (10 mg mL(-1), in N,N'-dimethylformamide). All-solid-state flexible supercapacitors manufactured on the basis of such graphene films deliver a high area capacitance of 11.3 mF cm(-2) and an excellent rate capability of 5000 mV s(-1). The described electrochemical exfoliation shows great promise for the industrial-scale synthesis of high-quality graphene for numerous advanced applications.
引用
收藏
页码:6083 / 6091
页数:9
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