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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.

吸收氢气。HAA合金由A元素（La、Mg、Ca、Ti等）和B元素（Ni、Fe、Cu等）组成。元素A通常是非常活泼的金属，在熔融盐中电沉积在基底B上，并相互扩散，形成具有吸氢性能的金属间化合物。该工艺具有直接从活性元素A源和薄膜型原料中生产的优点。在基体上形成的物相取决于电解条件，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薄膜LaNi_5。用电化学方法研究了HAA薄膜在碱性溶液中的充放电性能。在1023 K下，电流密度为0.1 Acm ↑ [2]，电解时间为0.4 ks时，在Ni基体上形成了25 μm的LaNi_5薄膜<-2>，该薄膜具有比工业LaNi_5锭更好的循环充放电吸放氢性能。Ni基体抑制了HAA膜在充放电过程中的脆化。而在Ni片上共电沉积La和Co则得到LaNi_<5-x>Co_x（X<1%）层。这种Co的加入也改善了循环性能。