Preparation of ZrMn_2 hydrogen storage alloy by electro-deoxidation in molten calcium chloride  

熔盐电脱氧法制备ZrMn_2储氢合金(英文)

作　　者：戴磊[1,2] 王硕[1] 王岭[1] 余瑶[1] 邵光杰[2] 

机构地区：[1]河北联合大学化学工程学院,唐山063009 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第9期2883-2889,共7页中国有色金属学报（英文版）

基　　金：Project(51201058)supported by the National Natural Science Foundation of China;Projects(E2010000941,E2014209009)supported by Hebei Provincial Natural Science Foundation of China

摘　　要：ZrMn2 alloy was electro-synthesized directly from cathode pellets compacted with powdered mixture of MnO2 and ZrO2 in molten calcium chloride. Sintering temperature, cell voltage and electrolysis time were the dominant factors that affected the characteristics of the final product. The results confirmed the formation of pure ZrMn2 alloy through the electro-deoxidation of the mixed oxide pellets at 3.1 V for 12 h in 900 °C CaCl2 melt. The X-ray diffraction（XRD） and cyclic voltammetry analysis suggested that the electro-deoxidation proceeded from the reduction of manganese oxides to Mn, followed by ZrO2 or CaZrO3 reduction on the pre-formed Mn to ZrMn2 alloy. The cyclic voltammetry measurements using powder microelectrode showed that the prepared ZrMn2 alloy has a good electrochemical hydrogen storage property.采用熔盐电脱氧法,由MnO2和ZrO2混合氧化物直接合成ZrMn2合金。研究烧结温度、电解电压及电解时间等工艺参数对产物组成的影响。在900°C的CaCl2熔盐中,经900°C烧结的混合氧化物阴极在3.1 V恒电压下电解12 h,可制备出纯相的ZrMn2合金。XRD和循环伏安结果表明,在电解过程中,Mn-O化合物首先还原成单质Mn,ZrO2和CaZrO3再在单质Mn表面还原,并与其合金化,形成ZrMn2合金。以粉末微电极为工作电极,循环伏安测试结果表明,所制备的ZrMn2合金表现出良好的电化学储氢性能。

关 键 词：ELECTRO-DEOXIDATION ZrMn2 alloy CaCl2 melt OXIDES hydrogen storage property 

分 类 号：TG139.7[一般工业技术—材料科学与工程]