Dataset title: Data of electrospun carbon nanofibre-based catalysts prepared with Co and Fe phthalocyanine for oxygen reduction in acidic medium Kaur Muuli, Marek Mooste, Srinu Akula, Viktoria Gudkova, Markus Otsus, Arvo Kikas, Jaan Aruväli, Alexey Treshchalov, Vambola Kisand, Aile Tamm, Andres Krumme, Sara Cavaliere, Kaido Tammeveski Contact information: Marek Mooste (marek.mooste@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 pulbished paper "Electrospun Carbon Nanofibre-Based Catalysts Prepared with Co and Fe Phthalocyanine for Oxygen Reduction in Acidic Medium" ChemElectroChem, e202300131 (https://doi.org/10.1002/celc.202300131). The electrochemical characterisation data, which was measured in University of Tartu Institute of Chemistry, is for Figures 1, 2, 4, 5, 6 and the nomenclature of the catalysts is the same as in the mentioned article. Data was collected using Autolab potentiostat/galvanostat PGSTAT30 (Metrohm Autolab, The Netherlands) controlled with NOVA version 2.1.4 software. The working electrode was glassy carbon electrode with diameter of 5 mm. For Figures 1, 2, 4, ,5, 6 electrochemical data, the measured currents have been converted from current (A) to current (mA) or current (ĀµA). For Figure 6a, the electrochemical data the time has been converted from time (s) to time (h). For Figures 2, 4, 5, 6, the background currents, measured in Ar-saturated solution, have been subtracted, in addition to conversion to current (mA). 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 investigation was financed by the Estonian Research Council (grants PRG4 and PRG723) and the M-ERA.Net project "C-MOF.cell"¯ (SLTKT20445). Present study was also funded by the European Union (EU) through the European Regional Development Fund (MOBJD671 and TK141 "Advanced materials and high-technology devices for energy recuperation systems"¯ and TK134 "Emerging orders in quantum and nanomaterials"¯). Authors would like to thank Dr. Maike Käärik and Dr. Jaan Leis for performing the low-temperature N2 physisorption investigation.