Fig. 4
From: −60 °C solution synthesis of atomically dispersed cobalt electrocatalyst with superior performance
Electrocatalysis in O2-saturated near neutral electrolyte and free-energy calculation. a Rotating disk electrode (RDE) polarization curves of atomic Co catalyst (Co/NMC-LT900), Co clusters or nanoparticles catalyst (Co/NMC-RT900), and commercial platinum–carbon catalyst (Pt/C) in 0.05 M phosphate buffer solution (PBS) solution at 1600 rpm calibrated with linear sweep voltammetry (LSV) data tested in N2. b Comparison of Jk at different potential values. b Tafel slope values at low over-potential regions with sweep rate 10 mV s−1 and rotation rate 1600 rpm. d Electron transfer number n (top) and H2O2 yield (bottom) vs. potential. e RDE polarization curves of Co/NMC-LT900 before and after 10,000 and 20,000 potential cycles, calibrated with LSV data tested in N2. f Calculated free-energy profiles for oxygen reduction reaction (ORR) steps on Co/NMC-LT900, and U is the applied potential (vs. RHE) during the ORR process. Detailed experimental data are listed in Supplementary Tables 4 and 5
