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- W2334715082 abstract "To assess the possibility of controlling the desorption temperature of palladium-absorbed hydrogen (Habs) through surface structural manipulation, we investigated coadsorption systems of H and CO on Habs-charged Pd(110) surfaces through temperature-programmed desorption, low-energy electron diffraction, and H-depth profiling by nuclear reaction analysis (NRA). A CO coverage of 0.5 ML lifts the H-induced (1 × 2) pairing-row (PR) reconstruction on Habs precharged Pd(110), and, as on clean Pd(110), heating Pd(110) (1 × 1) holding 0.3–1.0 ML of CO gives rise to a missing-row (MR) structure. Whereas Habs desorbs through surface defects of clean, PR-reconstructed Pd(110) at 160 K, CO coadsorption onto Habs-loaded Pd(110) gives rise to three new high-temperature shifted Habs desorption modes at 200, 270, and 375 K that are assigned to different exit sites for resurfacing Habs atoms at regular terraces of the individual Pd(110) structures, i.e., the (1 × 2) PR, bulk-terminated (1 × 1), and (1 × 2) MR reconstruction, respectively. Our results thus manifest the ability to control the Habs desorption temperature through surface restructuring in well-defined CO coverage regimes. Furthermore, the long-speculated transfer of chemisorbed H into the Pd interior upon CO coadsorption is confirmed directly by NRA, revealing also that all Habs diffuses into the Pd bulk at 200 K." @default.
- W2334715082 created "2016-06-24" @default.
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- W2334715082 date "2015-05-12" @default.
- W2334715082 modified "2023-10-16" @default.
- W2334715082 title "Desorption Temperature Control of Palladium-Dissolved Hydrogen through Surface Structural Manipulation" @default.
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- W2334715082 doi "https://doi.org/10.1021/acs.jpcc.5b02365" @default.
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