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. 2014 Jul 10;4:5639. doi: 10.1038/srep05639

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(a) RDE polarization curves in O₂ saturated 0.1 M KOH (rotation speed, 1600 rpm; scan rate, 5 mV s⁻¹) and (b) K-L plots of the samples derived from RDE data at different rotating speeds (0.6 V_RHE).