Effect of Chemical Etching on Protium Absorbing Properties and Electrochemical Characteristics of LaNi5 Alloys
Effect of Chemical Etching on Protium Absorbing Properties and Electrochemical Characteristics of LaNi5 Alloys
复制标题
化学刻蚀对LaNi5合金吸氕性能和电化学特性的影响
DOI：
10.2497/jjspm.46.131
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Okada
中科院分区：
文献类型：
--
作者：
T. Tamura;T. Kuriiwa;H. Takamura;Hazime Nakamura;M. Okada
当储氢合金用作镍-金属氢化物电池的负电极时，负电极处的氚吸收性能不同于气相处的那些，这是因为由于充电和放电在合金表面上形成氧化物层和富镍层。研究了表面化学刻蚀对LaNi 5合金吸氚性能和电化学性能的影响。使用低于1%的稀HCl溶液作为用于形成富镍层的蚀刻剂，该富镍层用作合金抵抗KOH电解质的保护表面。经0.2NHCl或0.02NHCl短时间刻蚀的LaNi 5退火样品的吸氚性能优于未刻蚀的LaNi 5退火样品。经0.02N HCl腐蚀60 min的退火LaNi 5样品的电化学性能比未经腐蚀的退火LaNi 5样品的循环稳定性好。
When hydrogen storage alloy is used as a negative electrode of nickel-metal hydride batteries, protium absorbing properties at a negative electrode is different from those at a gas phase because of the formation of oxide layers and a nickel-rich layer on the surface of the alloy due to charge and discharge. This paper investigates the effect of surface chemical etching on protium absorbing properties and electrochemical characteristics of LaNi5 alloys. Dilute HCI solution under 1% was used as etchants for the formation of a nickel-rich layer which works as a protection surface of the alloy against the KOH electrolyte. Protium absorbing properties of annealed LaNi5 samples which were etched shortly with 0.2N HCl or 0.02N HCl were better protium storage capacity than those of unetched annealed LaNi5 samples. Electrochemical characteristics of annealed LaNi5 samples which were etched for 60min with 0.02N HCl were better cycle stability than those of unetched annealed LaNi5 samples.