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

Table 2

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

Shell	𝑁^a	𝑅^b	1000×Δ𝜎^2c	Δ𝐸0^d	EXAFS reference
		(Å)	(Å^2)	(eV)
(a) Pt-Rublack
Ru-Ru	4.2 (2)	2.65 (4)	7.0 (3)	6.6 (3)	RuRu
Ru-Pt	2.6 (2)	2.71 (1)	5.8^∗f	9.9 (7)	RuPt
(b) Pt-Ruco/C
Ru-Cl	1.1 (1)	2.31 (1)	6.5 (2)	5 (2)	RuCl
Ru-Ru	3.8 (3)	2.65 (4)	5.2 (5)	5 (1)	RuRu
Ru-Pt	1.1 (3)	2.70 (2)	4.3^∗f	5 (3)	RuPt
Ru-Os	1.0 (3)	3.39 (4)	2.4 (5)	−8 (2)	RuO
(c) Pt-Ruse/C
Ru-Cl	0.8 (2)	2.32 (3)	8.2 (4)	7 (1)	RuCl
Ru-Ru	4.1 (2)	2.64 (3)	6.1 (3)	6 (1)	RuRu
Ru-Pt	0.4 (1)	2.68 (3)	4.7^∗f	−5 (3)	RuPt

^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.
∗fTuned parameter.