1. Nate Leonard

3. Pore Size Distribution of various carbon precursors and the associated catalysts modeled from DFT calculations based on nitrogen adsorption at 77K.

4. RRDE polarization curves plotted along with percent peroxide generation. Experimental conditions: 0.5M H 2 SO 4, 1200 rpm, catalyst loading 0.5 mg/cm 2 on glass carbon electrode.

5. Tafel plot of four different catalysts. Experimental conditions: 0.5M H 2 SO 4, 1200 rpm, catalyst loading 0.5 mg/cm2 on glass carbon electrode.

6. Relationship between mesoporous area of four different catalysts and two different parameters: nitrogen content and iR-free activity at 0.8 V vs. RHE.

7.  carbon mesoporosity can impact nitrogen adsorption electrochemical activity. substrates that can adsorb the most nitrogen show the highest activity. transport of precursors important to potential active sites. mesoporosity increases, both nitrogen adsorption and activity increase. Therefore activity maybe tied to both mesoporous transport and surface chemistry.