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Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts
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Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts
Posted:2016-03-18 17:07    Column:2014
K. Parvez, Z.-S. Wu, R. Li, X. Liu, R. Graf, X. Feng*, K. Müllen*,
Journal of the American Chemical Society 2014, 136 (16): 6083-6091. 
DOI: 10.1021/ja5017156  [PDF]

Abstract
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 cm2V–1s–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, inN,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–2and 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.

Dalian Institute of Chemical Physics, CAS
457 Zhongshan Road Dalian, China 116023
E-mail: wuzs@dicp.ac.cn
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