Characterization of Pt-Pd/C Electrocatalyst for Methanol Oxidation in Alkaline Medium

Table 1

Variation of long-term poisoning rate (δ), charge transfer resistance (𝑅_ct), and solution resistance (𝑅_𝑠) for methanol oxidation on Pt-Pd/C electrode at various methanol and NaOH concentrations at −160 mV.

	Methanol concentration (M)						NaOH concentration (M)
	0.1	0.2	0.5	1.0	2.0	3.0	0.1	0.5	1.0	2.0	3.0
δ (% per sec)	0.006	0.008	0.013	0.027	0.031	0.034	0.009	0.024	0.021	0.035	0.040
𝑅ct (ohm)	9.59	7.23	6.10	4.17	4.05	3.96	19.00	4.17	2.94	2.14	2.10
𝑅𝑠 (ohm)	4.30	4.35	4.40	4.47	4.50	4.52	19.15	4.47	2.72	1.88	1.02