Article history: Pd-coated Nb Ti Ni (Nb–TiNi) is considered a promising material for hydrogen-permeable mem- 40 30 30 Received 24 September 2015 branes because of the low usage of Pd metal. This paper reports the degradation of hydrogen permeability Accepted 27 October 2015 occurring during the permeation experiment above 773 K. Surface analysis using X-ray photoelectron Available online 2 November 2015 spectroscopy revealed that interdiffusion between the Pd coating and the constituent elements of Nb and Ti progressed during the permeation experiment. The diffused Ti was concentrated near the topmost Keywords: surface and then formed TiO , which resulted in a decrease in the Pd concentration at the topmost surface. XPS However, the diffused Nb was observed to bind to Pd in the surface and formed a Pd–Nb alloy beneath Hydrogen permeable membrane the topmost surface. We concluded that these changes caused the decline of the hydrogen permeability Nb-based alloy at high-temperature conditions. Decline of permeability © 2015 Elsevier B.V. All rights reserved. Interdiffusion 1. Introduction membrane mechanical strength [12,13]. Based on this unique struc- ture, the Nb–TiNi alloy shows high permeability against adsorbed Hydrogen fuel cells are a next-generation energy system that hydrogen atoms without hydrogen brittleness. However,
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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