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Preparation of LaNi5 by Electro-Deoxidation in Eutectic CaCl2-NaCl Melt

Author: MaSuJuan
Tutor: XuZuo
School: Northeastern University
Course: Chemical processes
Keywords: Hydrogen storage materials LaNi5 Electric deoxy Molten salt Coprecipitation
CLC: O614.331
Type: Master's thesis
Year: 2008
Downloads: 66
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Abstract


Metal hydrogen storage materials LaNi5 can be used for energy , mechanical energy , thermal energy and chemical energy conversion and storage , with a wide range of application areas . The process of the preparation of hydrogen storage materials is a complex process , energy consumption , environmental requirements , environmental pollution , and other shortcomings . In this paper, the FFC Cambridge Process method , also known as the molten salt electrical deoxy method direct preparation of hydrogen storage materials of LaNi5 . Molten salt electrical deoxy method is a novel , green production process , the method has a simple process , easy oxides before processing , easy to trace components doping advantages . In this article uses a total of precipitation and mechanical milling method prepared by two methods the cathode tablets, investigated the decomposition temperature of the preparation of the cathode sheet , sintering temperature , sintering time , sintering phase of the microscopic structure and material of the sheet body and the electrically deoxy results the impact; electrically deoxygenation process investigated voltage manner and the size of the applied voltage is applied to the pair of electrical deoxy results . Experimental results show that : La2O3 and NiO or La (NO3) 3 and Ni ( NO3) 3 as raw materials , using molten salt electrical deoxy legal system prepared hydrogen storage materials LaNi5 is feasible . The conditions for the preparation of the cathode sheet : The molding pressure was 10MPa, 1200 ℃ sintered 2H . The molten salt electrolysis conditions : graphite rod as anode , CaCl2-NaCl molten salt electrolyte , electrolysis temperature of 800 ° C , the operating voltage range of 3.2V to 5.0V ; the cathode sheet material after sintering at 1200 ℃ is and phase composition La3Ni2O7 and La2NiO4 the microwave sintering the La2NiO4 phase , the cathode La3Ni2O7 and La2NiO4 phase composition in lanthanum nickel oxide the raw electricity deoxy electrolysis successfully prepared LaNi5 important factor ; deoxidation process of molten salt electrical operating voltage from 3.2V to 5.0V the application manner can strengthen the molten salt power deoxidation process , guide to the LaNi5 alloy in a short period of electrolytic time .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section III group metal elements and their compounds > Lanthanides ( rare earth elements ) > Lanthanum La
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