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Direct Electrolysis Process of Hydrogen absorbing alloy films from Molten Salts and Film Characterization

熔盐直接电解吸氢合金膜工艺及膜表征

基本信息

批准号：
10450280
负责人：
OKIDO Masazumi
金额：
$ 4.29万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450280/
关键词：
Hydrogen absorbing alloy Molten salt electrolysis Lanthanum Intermetallic compound Functional film Hydride battery LaNi5 MgzNi

项目摘要

Hydrogen absorbing. alloy, HAA, consists of element A (La, Mg, Ca, Ti, etc) and element B (Ni, Fe, Cu, etc). The elements A, which are generally very active metals, were electrodeposited on substrate B in molten salts and diffused each other to make intermetallic compounds with hydrogen absorbing property. This process for HAA production has an advantage to produce directly from resources of active element A and film type.Lanthanum was electrodeposited on nickel substrate in chloride bath. The phase formed on the substrate depends on electrolysis conditions such as temperature, current density, electrolysis duration, etc. The HAA film, LaNi_5, can be obtained by controlling the electrolysis condition. The charge-discharge property for the HAA films were estimated electrochemically in an alkaline solution at ambient temperature. In La electrolysis, LaNi_5 layer with 25 μm formed on Ni substrate during 0.4 ks under the current density of 0.1 Acm^<-2> at 1023 K.This film showed better cyclic charge-discharge property for hydrogen adsorption/disorption than commercial LaNi5 ingot. The Ni substrate inhibited the embrittlement of HAA film on the surface during charge-discharge test. On the other hand, co-electrodeposition of La and Co on Ni sheet gave LaNi_<5-x>Co_x (X<1%) layer. This Co addition also improved cyclic property.

吸氢。合金HAA由A元素(La、Mg、Ca、Ti等)和B元素(Ni、Fe、Cu等)组成。A元素通常是非常活泼的金属，在熔盐中电沉积在B衬底上，然后相互扩散，形成具有吸氢性能的金属间化合物。该工艺具有从活性元素A和膜型资源直接生产的优点。在氯化物溶液中，在镍衬底上电沉积La。在衬底上形成的相取决于电解条件，如温度、电流密度、电解时间等，通过控制电解条件可以得到HAA膜LaNi5。用电化学方法研究了HAA薄膜在常温碱性溶液中的充放电性能。在La电解法中，在1023K，电流密度为0.1acm~(-2)的条件下，0.4k内在Ni基片上形成了25μm的LaNi5层，表现出比商品LaNi5合金更好的充放氢循环性能。在充放电测试中，镍衬底对表面HAA膜的脆化有抑制作用。另一方面，La和Co在镍片上共电沉积得到LaNi_x；5-x&Gt；Co_x(X&lt；1%)层。这种Co的加入也改善了循环性能。