Dataset title: Electroreduction of oxygen on iron- and cobalt-containing nitrogen-doped carbon catalysts prepared from the rapeseed press cake Silver Juvanen, Ave Sarapuu, Marek Mooste, Maike Käärik, Uno Mäeorg, Arvo Kikas, Vambola Kisand, Jekaterina Kozlova, Alexey Treshchalov, Jaan Aruväli, Jaan Leis, Aile Tamm and Kaido Tammeveski Contact information: Silver Juvanen (silver.juvanen@ut.ee), 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: "Electroreduction of oxygen on iron- and cobalt-containing nitrogen-doped carbon catalysts prepared from the rapeseed press cake", Journal of Electroanalytical Chemistry 920 (2022) 116599 (https://doi.org/10.1016/j.jelechem.2022.116599) The data is for Figures 3 and 4 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). The working electrode was bulk glassy carbon disk (0.2 cm2) covered with 200 ug cm-2 of catalyst. The experimental details are provided in the published paper. For the data in Figures 3 and 4 the measured currents have been converted from current (A) to current densities (mA/cm2). For data in Figures 3 and 4 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 Ministry of Education and Research, Estonia through Estonian Research Council (grant numbers PRG4, PRG723 and PRG1509). This research was also supported by the EU through the European Regional Development Fund (grant numbers TK141, "Advanced materials and high-technology devices for energy recuperation systems"; TK134, "Emerging orders of quantum and nanomaterials" and TK143, "Centre of Excellence in Molecular Cell Engineering").