Fig. 1.

(A) Schematic illustration of the homemade device for the in situ synchrotron-based (XRD study). (B) XRD patterns of the as-synthesized Pt₃Co/C alloy and Pt₃Co/C after further annealing at 700 °C in the in-situ heating cell. (C) Quantitative analysis of the peak integral of the (110) ordering peak and the (111) and (200) major peaks. (C, Inset) Illustration of background subtraction. (D) Quantitative calculations of the relative content of ordered intermetallic based on the assumption of a linear relationship between the ratio of the integrated areas of the ordered intermetallic peak at (110) to the sum of the (111) and (200) peaks.