Details

Autor(en) / Beteiligte

• Parvez, Khaled
• Wu, Zhong-Shuai
• Li, Rongjin
• Liu, Xianjie
• Graf, Robert
• Feng, Xinliang
• Müllen, Klaus

Titel

Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts

Ist Teil von

• Journal of the American Chemical Society, 2014-04, Vol.136 (16), p.6083-6091

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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)2SO4, Na2SO4, K2SO4, etc.). Exfoliation in these electrolytes leads to graphene with a high yield (>85%, ≤3 layers), large lateral size (up to 44 μm), low oxidation degree (a C/O ratio of 17.2), and a remarkable hole mobility of 310 cm2 V–1 s–1. Further, highly conductive graphene films (11 Ω 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.