Effect of Dissolution Temperature on Purity of LaNi5 Powder Synthesized with the Combustion-Reduction Method
Keywords:characterization, combustion-reduction, dilanthanum nickel oxide (La2NiO4), lanthanum pentanickel (LaNi5), synthesis temperature
The LaNi5 intermetallic phase has been extensively investigated because of its excellent properties, such as attractive hydrogen storage, medium plateau pressure, and easy activation. LaNi5 phase is generally produced by a complicated method, which involves several steps, i.e. melting, alloying, casting, softening and making them into powder. This study aimed to develop a new LaNi5 synthesis process by modifying the combustion-reduction method. In this method it is very important to produce La2NiO4, because LaNi5 is formed from the process of reducing this phase. The precursor powders La(NO3)3.6H2O and Ni(NO3)2.6H2O were reacted with distilled water as a solvent medium and mixed using magnetic stirring. The synthesis process was carried out at room temperature, 60C, 70C, and 80C for 10 minutes until the solution became transparent green. The solution was then dried for 2 hours at 100C to form a transparent green gel. The gel was calcined at a temperature of 500C for 2 hours, producing a black powder. The optimal black powder was then reduced using CO gas at 600C for 2 hours. The powder samples were characterized using XRD, FTIR, and SEM-EDX. The analysis revealed that synthesis at room temperature was the most optimal method for the reduction process because it produced the most La2NiO4, at 12.135 wt%.
Henao, J. & Martinez-Gomez, L., Review: On Rare-earth Perovskite-type Negative Electrodes in Nickel-Hydride (Ni/H) Secondary Batteries, Materials for Renewable and Sustainable Energy, 6(2), pp.1-14, 2017.
Li, M.M., Yang, C.C., Wang, C.C., Wen, Z., Zhu, Y.F., Zhao, M., Li, J.C., Zheng, W.T., Lian, J.S. & Jiang, Q., Design of Hydrogen Storage Alloys/Nanoporous Metals Hybrid Electrodes for Nickel-Metal Hydride Batteries, Scientific Reports., 6, pp. 1-10, 2015.
Ruiz, F.C., Martez, P.S., Castro, E.B., Humana, R., Peretti, H.A. & Visintin, A., Effect of Electrolyte Concentration on the Electrochemical Properties of an AB5-type Alloy for Ni/MH Batteries, International Journal of Hydrogen Energy, 38(1), pp. 240-245, 2013.
Liu, W. & Aguey-Zinsou, K.F., Low Temperature Synthesis of LaNi5 Nanoparticles for Hydrogen Storage, International Journal of Hydrogen Energy, 41(3), pp. 1679-1687, 2016.
Schlapbach, L., Magnetic Properties of Lani5 and Their Variation with Hydrogen Absorption and Desorption, Journal of Physics F Metal Physics, 10(11), pp. 2477-2490, 1980.
Aldebert, P. & Traverse, J.P., ude par Diffraction Neutronique des Structures de Haute, Materials Research Bulletin, 14(3), pp. 303-323, 1979.
Smith, B.B.C., Fundamentals of Fourier Transform Infrared Spectroscopy, Ed. 2, CRC Press, 2011.
Masterton, W.L., Hurley, C.N. & Neth, E.J., Chemistry Principles and Reactions, ed. 7, Cengage Learning, 2011.
Silvesterstein, R.M., Webster, F.X. & Kiemle, D.J., Spectrometric Identification of Organic Compounds ,ed. 7, John Willey & Sons, 2005.
Sudirman, S., Indriyati, I., Adi, W.A., Yudianti, R. & Budianto, E., Structural Analysis of Platinum Nanoparticles on Carbon Nanotube Surface as ElectrocatalystSystem, International Journal of Chemistry, 9(2), pp. 60-66, 2017.
Liu, W., Novel Approaches to Store Hydrogen in High Capacity Hydride, PhD Dissertation, School of Chemical Engineering, Faculty of Engineering, University of New South Wales, UNSW Australia, Sydney, 2015.