Enhanced hydrogen storage performance of reduced graphene oxide hybrids with nickel or its metallic mixtures based on spillover mechanism. (20th July 2016)

• Record Type: Journal Article
• Authors: Wei, Lin; Mao, Yuanbing
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 27(2016)
• Page Start: 11692
• Page End: 11699
• Publication Date: 2016-07-20
• Subjects: Graphene -- Nickel -- Metallic -- Spillover -- Hydrogen storage; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.04.030
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, as a fascinating 2-dimensional carbon material, reduced graphene oxide (rGO) has been decorated with Ni, Ni/Pd, and Ni/Ag/Pd nanoparticles on its surface to enhance its hydrogen storage performance based on the spillover mechanism. First, graphene oxide (GO) was fabricated from graphite by a modified Hummer method. Next the GO was dispersed in water and mixed with nickel chloride, palladium chloride, and/or silver nitrate to synthesize parental Ni(OH)2 /GO, Ni(OH)2 /Pd(OH)2 /GO, and Ni(OH)2 /Pd(OH)2 /AgOH/GO hybrids through hydrothermal treatment with HMTA as a capping and precipitation agent. After in situ reduction of these parental hybrids with hydrogen flow and heat treatment at 350 °C, nanostructured Ni/rGO, Ni/Pd/rGO, and Ni/Ag/Pd/rGO hybrids were obtained. These Ni (Ni/Pd, or Ni/Ag/Pd)/rGO hybrids show great potential in hydrogen storage at ambient environment, as measured at room temperature (293.15 K) and 800 mmHg, 0.007, 0.13, and 0.055 wt% hydrogen adsorption capacity was obtained from the Ni/rGO, Ni/Pd/rGO, and Ni/Ag/Pd/rGO hybrids, respectively. Graphical abstract: Highlights: Reduced graphene oxide (rGO) was decorated with metallic nanoparticles. Ni/rGO, Ni/Pd/rGO and Ni/Ag/Pd/rGO hybrids were synthesized. High hydrogen adsorption capability was observed at ambient environment. Enhancement on H2 storage performance was attributed to the spillover mechanism. Composition of the metallic NPs affects H2 adsorption/desorption reversibility.