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. 2015 Jun 4;6:7345. doi: 10.1038/ncomms8345

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(a), Voltammograms in O₂-saturated 0.1 M KOH electrolyte by subtracting the voltammograms in Ar. The electrode rotation rate is 900 r.p.m. (b), Kinetic current densities at 0.7 V and required potentials for I_k=3 mA cm⁻². (c), Electron transfer number (n) at different potentials. (d), Tafel plots constructed from the voltammetry data. The slope unit is mV dec⁻¹.