Fe-N-Doped Carbon Capsules with Outstanding Electrochemical Performance and Stability for the Oxygen Reduction Reaction in Both Acid and Alkaline Conditions

The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsnano.6b01247. Tables of reported ORR performance; Figures S1−S9 showing additional data as discussed in the text (PDF)This research work was supported by the Spanish Ministerio de Economıa y Competitividad, MINECO (MAT2012-31651), ́ Fondo Europeo de Desarrollo Regional (FEDER), and FICYT Regional Project (GRUPIN14-102). G.A.F. thanks the MINECO for his predoctoral contract, and M.S. thanks the Spanish Ministerio de Ciencia e Innovacion for her Ramo ́ n y ́ Cajal contract