▎ 摘　　要

A novel, one-step, wet-free, environmental friendly and high-yield method for producing few-layer graphene powders with large surface areas (up to 800 m(2)/g) and narrow nanopore sizes (0.7-0.8 nm) using plasma-induced exfoliation of natural graphite is presented. Advanced characterization techniques were employed, including scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and N-2 gas adsorption/desorption measurements at 77 K, to investigate the morphological, elemental, structural and textural/porosity properties of these nanomaterials. Fully reversible H-2 gas adsorption/desorption isotherms with maximum gravimetric capacities of up to similar to 2 wt.% at 77 K and similar to 60 bar are reported here. The H-2 storage performance at 77 K is well correlated with certain textural features such as specific surface area and microporosity. The results of this work provide a valuable feedback for further research on plasma-processed graphene-based materials towards efficient H-2 storage via cryo-adsorption. (C) 2016 Elsevier Inc. All rights reserved.