EXAFS Peaks and TPR Characterizing Bimetallic Interactions: Effects of Impregnation Methods on the Structure of Pt-Ru/C Catalysts

Table 1

Summary of EXAFS analysis results for Pt-Ru catalysts at Pt_LIII edge.

Shell	𝑁^a	R ^b	1000×Δ𝜎^2c	Δ𝐸0^d	EXAFS reference
		(Å)	(Å^2)	(eV)
(a) Pt-Rublack
Pt-Pt	5.1 (3)^*e	2.74 (1)	5.9 (5)	−2 (1)	PtPt
Pt-Ru	2.7 (3)	2.70 (1)	5.5 (5)	−2 (1)	PtRu
(b) Pt-Ruco/C
Pt-Pt	5.6 (3)	2.73 (1)	6.1 (6)	−1 (1)	PtPt
Pt-Ru	1.8 (2)	2.69 (2)	4.1 (6)	−1 (1)	PtRu
(c) Pt-Ruse/C
Pt-C	1.2 (4)	2.08 (1)	5.1 (3)	−1 (1)	PtC
Pt-Pt	8.0 (3)	2.74 (1)	7.3 (4)	−2 (1)	PtPt
Pt-Ru	0.7 (2)	2.66 (2)	4.8 (3)	3 (2)	PtRu

^a𝑁: the coordination number for the absorber-backscattering pair.
^b𝑅: the average absorber-backscattering distance.
^cΔ𝜎²: the difference in Debye-Waller factors between sample and standard.
^dΔ𝐸₀: the inner potential correction.
∗eValue in the parentheses is standard deviation (in the last given digit) calculated from the covariance matrix and the estimates of the noise level in the raw data.