Microwave Assisted Synthesis of Osmium Electrocatalysts for the Oxygen Reduction Reaction in the Absence and Presence of Aqueous Methanol

Table 2

Open circuit potential values and ORR kinetic parameters of the osmium electrocatalysts in O₂-saturated 0.5 mol L⁻¹  H₂SO₄, at 25°C.

Power (Watts)	Temperature (°C)	Time (Min)	𝐸oc (V/NHE)	[CH3OH] (mol L^−1)	b (mV/decade)	𝛼	j0 (mA/cm^2)
100	180	60	0.761	0	332.32	0.1805	4.49 𝐸−04
			0.598	2	261.58	0.2262	6.50 𝐸−05
100	180	30	0.755	0	382.85	0.1551	7.31 𝐸−04
			0.599	2	302.95	0.1953	1.84 𝐸−05
80	180	30	0.758	0	356.18	0.1667	3.83 𝐸−04
			0.591	2	215.43	0.2743	1.35 𝐸−05
30% Pt/Vulcan			1.006	0	91.46	0.6469	5.87 𝐸−04
			0.5416	2	—	—	—
Os3(CO)12-Vulcan/n-octane, 30 h^a			0.743	0	233	0.2584	7.31 𝐸−04
Osx(CO)y/1,2-dichlorobenzene^b			0.707	0	193.81	0.3060	1.25 𝐸−04
(insoluble in the reaction mixture)			0.707	2	216.75	0.2736	2.52 𝐸−04
Osx(CO)y/1,2-dichlorobenzene^b			0.777	0	193.32	0.3061	3.84 𝐸−04
(soluble in the reaction mixture)			0.777	2	187.88	0.3149	2.92 𝐸−04

^aReference [6]; ^bReference [7].