Fig. 2: Physical and chemical characteristics of catalyst supports and catalysts.

a XRD patterns of KB and S-KB. b HAADF-STEM images, and the corresponding EDS elemental mappings of C and S in S-KB. c High-resolution deconvoluted XPS spectra of S2p for KB and S-KB. d XRD patterns of Pt/C, Pt3Co/KB and Pt3Co/S-KB. e TEM image of Pt3Co/S-KB. Inset: histogram of particle size statistics. f EDS electronic mappings of Pt, Co, and S of representative Pt3Co/S-KB.