Exfoliation of graphite into graphene in aqueous solutions of inorganic salts

Parvez K, Wu ZS, Li R, Liu X, Graf R, Feng X, Muellen K (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Journal of the American Chemical Society American Chemical Society

Book Volume: 136

Pages Range: 6083-6091

Journal Issue: 16

DOI: 10.1021/ja5017156

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 ((NH 4)2SO4, Na2SO4, K 2SO4, 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. © 2014 American Chemical Society.

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research

Germany (DE) Linköpings universitet / Linköping University

Sweden (SE)

How to cite

APA:

Parvez, K., Wu, Z.-S., Li, R., Liu, X., Graf, R., Feng, X., & Muellen, K. (2014). Exfoliation of graphite into graphene in aqueous solutions of inorganic salts. Journal of the American Chemical Society, 136(16), 6083-6091. https://doi.org/10.1021/ja5017156

MLA:

Parvez, Khaled, et al. "Exfoliation of graphite into graphene in aqueous solutions of inorganic salts." Journal of the American Chemical Society 136.16 (2014): 6083-6091.

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