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• W1993524121 abstract "Abstract FeTi is an excellent hydrogen storage material; however, it deactivates after numerous charge-discharge cycles. This study investigates the mechanism for deactivation as well as the use of a protective palladium coating to eliminate deactivation using a non-destructive technique which samples the integrity of the FeTi below the palladium coating. Specifically, conversion electron Mossbauer spectroscopy (CEMS), X-ray photoelectron spectroscopy (XPS) and “static” secondary ion mass spectrometry (SIMS) were used to analyze the topmost 10nm, 2nm and monolayer respectively of a 10nm FeTi specimen after various annealings and reduction treatments. A 5 nm palladium coating was applied to an identical specimen and analyzed with CEMS after similar treatments. Analyses of the uncoated specimen revealed that titanium, initially in FeTi, reacted with O2-H2O impurities in the H2 charging gas to produce TiO2 at the outermost surface while forming iron domains in the near-surface region. During annealing at 450 K for 3 h, a solid state reaction was also noted to occur in which Fe2O3 was reduced by adjacent titanium in FeTi. This solid state reaction parallels the gas phase reaction for initial activation of FeTi after exposure to air. Analyses of the palladium-coated specimen could only be performed using CEMS because of its unique ability to probe below the coating at the Pd-FeTi interface, a region which is below the sampling depths of both XPS and static SIMS. The palladium coating provided an effective oxygen barrier which prevented deactivation and maintained the integrity of FeTi." @default.
• W1993524121 created "2016-06-24" @default.
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• W1993524121 date "1988-12-01" @default.
• W1993524121 modified "2023-09-24" @default.
• W1993524121 title "Chemical characterization of the deactivation and protection of FeTi thin films using complementary non-destructive techniques" @default.
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• W1993524121 doi "https://doi.org/10.1016/0040-6090(88)90383-5" @default.
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