氧化物直接制备储氢合金LaNi_5新工艺  

Direct preparation of LaNi_5 hydrogen storage alloy from oxide precursors by a new process

作　　者：赵炳建[1] 赵艳琴 司新国[1] 袁辉[1] 鲁雄刚 

机构地区：[1]唐山钢铁集团有限责任公司,唐山063016 [2]华北理工大学,唐山063009 [3]上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《粉末冶金材料科学与工程》2016年第1期154-159,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(50774052);上海大学研究生创新基金资助项目(SHUCX101052)

摘　　要：以La2O3和Ni O为原料,通过压制与烧结制成La2O3-Ni O圆形阴极片,然后采用固体透氧膜法(solid oxygenion membrane,SOM)直接制备LaNi5储氢材料,分析La2O3-Ni O烧结片的物相组成,及Ca Cl2熔盐中的侵蚀反应;结合循环伏安曲线和电解中间产物的组成,分析电解反应机理。结果表明:SOM法电解La2O3-Ni O烧结片直接制备LaNi5是可行的,电解3 h后,La2O3-Ni O电极片呈海绵状,其成分为LaNi5;电解机理为La4Ni3O10在氩气气氛下转变为La2Ni O4,La2Ni O4与Ca Cl2熔盐反应生成La OCl和Ni O,随后Ni O电解还原出的金属Ni与La OCl反应生成LaNi5;电解的电流效率为86.7%,能耗为3.55(k W·h)/kg,电流效率、能耗及产品形貌方面都优于熔盐电解法和合金熔炼法,有良好的应用前景。La2O3-Ni O rotundity negative cathode was fabricated by pressing and sintering procedures using La2O3 and Ni O as raw materials, then a new process（solid oxygen-ion membrane, SOM process） was taken to produce LaNi5 alloy directly from its oxide precursors. The phase composition, corrosion in the molten salt of the sintered pellets were examined, the reduction mechanism was investigated by analyzing the CV curve and phase constitution of the intermediate product. The results show that direct electrochemical reduction of mixed Ni O and La2O3 powders to the LaNi5 alloy by SOM process is feasible. La2O3-Ni O cathode plate composed of LaNi5 appears apongy. The reduction of sintered pellet started from La4Ni3O10 deoxidizes into La2 Ni O4, La2 Ni O4 reacts with Ca Cl2 to form La OCl and Ni O, Ni O is deoxidized into Ni, then Ni reacts with La OCl into LaNi5. The current efficiency is 86.7%, the electrolysis energy consumption is as low as 3.55（k W·h）/kg, which are all better than that of FFC and alloy smelting processes, and shows favorable apply foreground.

关 键 词：透氧膜 电解 电流 能耗 熔盐 LANI5合金 

分 类 号：TG146.4[一般工业技术—材料科学与工程]