10.26165/JUELICH-DATA/XF24KT Borowec, Julian0000-0003-3290-500X(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen)Poc, Jean-Pierre0009-0005-8675-5547(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen)Basak, Shibabrata0000-0002-4331-4742(IET-1 Forschungszentrum Jülich)Dobrenizki, Ladislaus(Siemens Energy Global GmbH & Co KG, SE TI SES PRM)Schmid, Günter0000-0001-7836-5171(Siemens Energy Global GmbH & Co KG, SE TI SES PRM)Jodat, Eva0009-0004-8214-2981(IET-1 Forschungszentrum Jülich)Karl, André0000-0003-2289-5987(IET-1 Forschungszentrum Jülich)Eichel, Rüdiger-A.0000-0002-0013-6325(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen, Faculty of Mechanical Engineering RWTH Aachen)Hausen, Florian0000-0001-5712-6761(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen) Jülich DATA 2025 This replication data set provides the raw data for the publication: "Proton Exchange Membrane Water Electrolyzer Cathode: A Nanomechanical and Nanoelectrical Analysis" (DOI: 10.1149/1945-7111/add213) It contains the PeakForce Tunnelling Atomic Force Microscopy (PF-TUNA, Bruker, USA) experiments on pristine and operated membrane electrode assembly (MEA) cathodes and the respective polystyrene - low density polyethylene (PS-LDPE) calibration files. All PF-TUNA files were generated with a Dimension Icon and the Nanoscope software (Bruker, USA). Additionally, nanoindentation data is stored herein with respective optical microscope images of the indented area. The nanoindentation data were generated with a Hysitron TI 980 and the TriboScan software (Bruker, USA) on the same MEAs as the AFM data. The data provides information about local MEA cathode aging upon long-term operation in a proton membrane electrolyzer cell with respect to porous transport layer related compression. Folder contents (switch to "tree view" to see the folders): - AFM: AFM data. Read the _README_AFM.txt file within this folder for more information - Nanoindenter: Nanoindentation data. Read the _README_NANOINDENTATION.txt file within this folder for more information Borowec, Julian(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen)Hausen, Florian(IET-1 Forschungszentrum Jülich, IPC RWTH Aachen)