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

Figure 4

Cyclic voltammograms in the absence and presence of 2 mol L⁻¹ methanol of the osmium catalysts synthesized at (a) 180°C/30 min/80 watts; (b) 180°C/30 min/100 watts; (c) 180°C/60 min/100 watts; (d) 30% Pt/Vulcan XC-72. The electrolyte was 0.5 mol L⁻¹  H₂SO₄ and the sweep rate 20 mV/s for the osmium electrocatalysts and 50 mV/s for Pt.

(a)

(b)

(c)

(d)