In situ synthesis of graphene supported Co-Sn-B alloy as an efficient catalyst for hydrogen generation from sodium borohydride hydrolysis. (21st January 2016)

• Record Type: Journal Article
• Authors: Cui, Zhenkai; Guo, Yueping; Ma, Jiantai
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 3(2016)
• Page Start: 1592
• Page End: 1599
• Publication Date: 2016-01-21
• Subjects: Co-Sn-B -- Graphene -- In-situ -- Sodium borohydride -- Hydrogen generation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.11.081
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, graphene (GP) supported Co-Sn-B alloy were synthesized via in situ chemical reduction reactions for hydrogen generation (HG) from alkaline sodium borohydride (NaBH4 ). X-ray diffraction (XRD), high resolution transmission electron Microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) were employed to verify the structure, morphology and the surface element composition of the alloy. Coupled plasma-atomic emission spectrometry (ICP-AES) were used to analyze the surface composition of the alloy. The effects of complexing agent addition, Co/Sn molar ratio, graphene loading on catalytic activity of the alloy were studied. The maximum hydrogen generation rate reached 11, 272 mL min −1 gCo −1 at 30 °C in 5 wt. % NaOH and 5 wt. % NaBH4 solution, which was three times higher than unsupported Co-B catalysts. The activation energy of the catalytic hydrolysis reaction of sodium borohydride was 39.57 kJ/mol, which is comparable to the noble metal catalysts. Highlights: The Co-Sn-B/GP catalyst was synthesized via in situ chemical reduction reactions. The effects of complexing agent, molar ratios of Co/Sn and the graphene loading were studied. The highest hydrogen generation rate of 11, 272 mL gCo −1 min −1 was achieved.