Dataset title: Iron-Containing Nitrogen-Doped Carbon Nanomaterials Prepared via NaCl Template as Efficient Electrocatalysts for Oxygen Reduction Reaction Silver Juvanen, Ave Sarapuu, Sergei Vlassov, Mati Kook, Vambola Kisand, Maike Käärik, Alexey Treshchalov, Jaan Aruväli, Jekaterina Kozlova, Aile Tamm, Jaan Leis, and Kaido Tammeveski Contact information: Ave Sarapuu (ave.sarapuu@ut.ee), Kaido Tammeveski (kaido.tammeveski@ut.ee) Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia This dataset contains the data presented in the figures of published paper: "Iron-Containing Nitrogen-Doped Carbon Nanomaterials Prepared via NaCl Template as Efficient Electrocatalysts for Oxygen Reduction Reaction", ChemElectroChem 8 (2021) 2288-2297 (https://doi.org/10.1002/celc.202100571) The data is for Figure 4a, 5, 6a, 7a and 7b and the nomenclature of the catalysts is the same as in the published paper. Data was collected using Autolab potentiostat/galvanostat PGSTAT30 (Metrohm Autolab, The Netherlands) controlled with General Purpose Electrochemical System (GPES version 4.9.007) software. The experimental details are provided in the published paper. For the data in Fig 4a, 5, 7a and 7b the measured currents have been converted from current (A) to current densities (mA/cm2, that is multiplied by 1000 and divided by 0.2 cm2). For data in Fig 4a, 5, 6a, 7a and 7b the background currents, measured in Ar-saturated solution, have been subtracted. Licence: This dataset is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Funding: This work was supported by the Estonian Research Council (grant PRG723 and PRG4) and by institutional research funding (IUT34-14) of the Estonian Ministry of Education and Research. This research was also supported by the EU through the European Regional Development Fund (TK141, “Advanced materials and high-technology devices for energy recuperation systems” and TK134, “Emerging orders of quantum and nanomaterials”).