Figure 2.
High-energy resolution XPS spectra showing (a) Pd 3d and (b) Pt 4f peaks of the PtPd/HPC-1 sample, (c) Pd 3d and (d) Pt 4f peaks of the PtPd/HPC-2 sample, and (e) Pd 3d and (f) Pt 4f lines of the PtPd/HPC-3 sample.
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