A novel Enteromorpha based hydrogel for copper and nickel nanoparticle preparation and their use in hydrogen production as catalysts. (9th March 2017)

• Record Type: Journal Article
• Authors: Zhao, Liwei; Li, Qian; Su, Yuan; Yue, Qinyan; Gao, Baoyu
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 10(2017)
• Page Start: 6746
• Page End: 6756
• Publication Date: 2017-03-09
• Subjects: Enteromorpha based hydrogel -- In situ metal nanoparticles -- Catalysis -- Hydrogen generation -- Kinetics; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.02.092
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel ploy(Enteromorpha-g-acrylic acid) p(EP-g-AA) hydrogel was synthesized and used as a template to prepare Cu and Ni nanoparticles. Then the hydrogel-metal nanoparticles (hydrogel-M (M: Cu, Ni)) were employed as catalyst in the generation of hydrogen from the hydrolysis of NaBH4 . X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), energy-dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD) were employed to determine the structure of p(EP-g-AA)-M (M: Cu, Ni) composite hydrogels. The effects of several parameters such as the amount of catalyst, initial concentration of NaBH4 and reaction temperature on the hydrolysis reaction were investigated. The kinetics of the hydrolysis reaction under different temperatures was also evaluated to determine the activation parameters. Experimental results showed that the catalytic efficiency of p(EP-g-AA)-Ni was much better than the catalytic efficiency of p(EP-g-AA)-Cu. And increasing the amount of catalyst and decreasing the NaBH4 concentration help to improve the reaction rate. Activation energy for the hydrolysis reaction was 42.61 kJ mol −1 catalyzed by p(EP-g-AA)-Cu and 39.10 kJ mol −1 by p(EP-g-AA)-Ni, respectively. At the end of five repetitive uses, p(EP-g-AA)-Cu composites possessed 64% activity and p(EP-g-AA)-Ni owned 70% activity. And after being stored for 30 days, p(EP-g-AA)-Cu and p(EP-g-AA)-Ni both remained 85% activity. Graphical abstract: Highlights: Enteromorpha based hydrogel for copper and nickel nanoparticle was prepared. Hydrogel-metal nanoparticle composite were characterized. Hydrogel-metal nanoparticle composite were utilized as catalysts for hydrogen generation from hydrolysis of NaBH4 . Hydrogen production rate under various conditions were studied.