The hydrogen electrode reaction characteristics of thin film electrodes of Ni-based hydrogen storage alloys

✍ Scribed by K. Machida; M. Enyo; G. Adachi; J. Shiokawa

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 731 KB
• Volume: 29
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(84)80018-3

✦ Synopsis

Absrmct-Film-type electrodes of hydrogen absorbing intermetallic compound and alloys, LaNi,, Ni0.11Ti0,89, NiO.,OTiO.,O and NiO.,,TL, were prepared by a Aash evaporation method. The hydrogen electrode reaction characteristics of the LaNi, and Ni-Ti alloy films in 1 h4 NaOH are very similar to each other. The reaction proceeds vin the Volmer-Tafel reaction route with mixed rate-determining characteristics. The exchange current densities of the constituent steps, as well as the overall reaction, are in the range of 10e6 A crK2 (true). Surface analysis by an XPS technique has shown that La or Ti on the electrode surface exists as an electrocatalytically innert oxide of La,O, or TiOz. Close similarities of these electrodes with riure Ni electrodes indicate that Ni IS reseonsible for the electrocatalytic activity. No synergistic effect is thus noticeable.