Hydrogen evolution and capacitance behavior of Au/Pd nanoparticle-decorated graphene heterostructures. (September 2017)

• Record Type: Journal Article
• Authors: Toth, Peter S.; Velický, Matěj; Slater, Thomas J.A.; Worrall, Stephen D.; Haigh, Sarah J.
• Is Part Of: Applied materials today. Volume 8(2017)
• Page Start: 125
• Page End: 131
• Publication Date: 2017-09
• Subjects: CVD chemical vapor deposition -- GR graphene -- Pd/GR palladium NPs on the topside of graphene -- Au/GR gold NPs on the topside of graphene -- GR/Pd palladium NPs on the underside of graphene -- Au/GR/Pd gold NPs on the topside and palladium NPs on the underside of graphene -- 2D two-dimensional -- 3D three-dimensional -- HAADF-STEM high-angle annular dark-field scanning transmission electron microscope -- EDXS energy-dispersive X-ray spectroscopy -- PMMA polymethyl methacrylate; Graphene -- Metal nanoparticles -- Electron tomography -- Hydrogen evolution -- Capacitance; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2017.07.008
• Languages: English
• ISSNs: 2352-9407

Abstract

Graphical abstract: Highlights: Single-metal and bi-metal graphene heterostructures are prepared at liquid/liquid interfaces. The asymmetrically decorated graphene nanocomposites are characterized using high-resolution transmission electron microscopy and 3D electron tomography. The electrochemical performances of the graphene-based hybrid materials are investigated using micro-droplet setup. Abstract: The outstanding properties of two-dimensional materials such as graphene offer the possibility to produce novel hybrid materials with boosted functionality for use in catalysis and electrochemical energy storage. The hydrogen evolution reaction and interfacial capacitance performance of monolayer graphene sheets decorated with various metal nanoparticles are studied herein. Chemical vapor deposition grown graphene monolayer was decorated with Au and/or Pd nanoparticles, either on one side or both sides, forming single- or bi metal graphene heterostructures. These asymmetrically decorated graphene nanocomposites were characterized using high-resolution scanning transmission electron microscopy and 3D electron tomography. Electrochemical characterization reveals enhanced hydrogen evolution activity and outstanding capacitance for the resultant composite materials in comparison to pristine graphene and other recently developed graphene-based energy storage devices.