GENERAL INFORMATION Title: Data from "Direct Observation of Structural Disorder Effects on Iridium Dioxide Nanocrystal Dissolution" Author information: Matteo Fratarcangeli Duke University 124 Science Drive Durham, NC 27708 matteo.fratarcangeli@duke.edu S. Avery Vigil Duke University 124 Science Drive Durham, NC 27708 avery.vigil@duke.edu Ziqing Lin Duke University 124 Science Drive Durham, NC 27708 ziqing.lin@duke.edu Conner J. Soderstedt Duke University 124 Science Drive Durham, NC 27708 conner.soderstedt@duke.edu Ivan A. Moreno-Hernandez* Duke University 124 Science Drive Durham, NC 27708 ivan.moreno-hernandez@duke.edu *Corresponding author, principal investigator Dates of data collection: 2024 02 21 - 2024 06 05 Collected at: Shared Materials Instrumentation Facility at Duke University, using a Tecnai G2 Twin microscope equipped with a Gatan Oneview camera. Keywords: Iridium dioxide, oxygen evolution reaction, liquid phase transmission electron microscopy, dissolution, heterogeneity, structural disorder DATA AND FILE OVERVIEW README: This document, aiming to assist in the interpretation of the provided data. Written on 2024 11 04. Consisting of: GENERAL INFORMATION DATA AND FILE OVERVIEW SHARING AND ACCESS INFORMATION METHODOLOGICAL INFORMATION TIFF_files: A collection of the videos analyzed for the publication. All video files were created on 2024 08 14. These videos are stored as collections of .tif files, at a framerate of 1 fps, and at a resolution of 1024x1024. This is a subset of the data collected, as the full-fidelity dataset is 10 fps and 2048x2048. However, due to institutional restrictions on the maximum size of data that is storable, these reductions were necessary. The full-fidelity dataset will be provided upon request. Videos are first organized into 4 subfolders which describe the experimental conditions and then by date of collection. Experimental conditions are described as followed: 1. 900c_data - videos of the dissolution of nanocrystals grown at 900 C in a 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl electrolyte. 2. 800c_data - videos of the dissolution of nanocrystals grown at 800 C in a 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl electrolyte. 3. 700c_data - videos of the dissolution of nanocrystals grown at 700 C in a 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl electrolyte. 4. Mg_control - videos of the dissolution of nanocrystals grown at 900 C in a 25 mM MgCl2, and 100 mM HCl electrolyte. The pixel values for these .tif files represent the electron count on those pixels from the Gatan Oneview. Code: 1. dmread - Read Digital Micrograph version 3 and 4 file and return the tag structure and the image. Written by Andreas Korinek, korinek@mcmaster.ca 2. read_frame - short functionalization of dmread, allowing for the extraction of specific frames. 3. video_info_IrO2_900c - Summary of the experimental data extracted from each video file for nanocrystal synthesized at 900 C. The chemical naming convention for the videos listed in video_info files are for the electrolyte solution as prepared - upon mixing with the nanoparticle suspension, these values will change to their published concentrations, 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl. Last updated 2024 08 02. 4. video_info_IrO2_800c - Summary of the experimental data extracted from each video file for nanocrystal synthesized at 800 C. The chemical naming convention for the videos listed in video_info files are for the electrolyte solution as prepared - upon mixing with the nanoparticle suspension, these values will change to their published concentrations, 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl. Last updated 2024 05 16. 5. video_info_IrO2_700c - Summary of the experimental data extracted from each video file for nanocrystal synthesized at 700 C. The chemical naming convention for the videos listed in video_info files are for the electrolyte solution as prepared - upon mixing with the nanoparticle suspension, these values will change to their published concentrations, 25mM FeCl3, 25 mM MgCl2, and 100 mM HCl. Last updated 2024 07 02. 6. video_info_IrO2_900c_MgCl - Summary of the experimental data extracted from each video file for nanocrystal synthesized at 900 C. The chemical naming convention for the videos listed in video_info files are for the electrolyte solution as prepared - upon mixing with the nanoparticle suspension, these values will change to their published concentrations, 25 mM MgCl2, and 100 mM HCl. Last updated 2024 05 03. 4. tiff_maker - The code that was used to convert .dm4 files to .tif files. Last updated 2024 08 14. 5. tiff_reader - Sample code for reading the provded .tif files. SHARING AND ACCESS INFORMATION The data herein is licensed as a CC0 public domain dedication. No rights reserved. METHODOLOGICAL INFORMATION Data generation: Liquid phase TEM data were generated via previously detailed methods, such as those in Crook et al. (10.1021/jacs.2c07778) and Vigil et al. (10.1021/jacs.3c13709). Data processing: Data were processed using a custom MATLAB script that read .dm4 files, resized the images to 1024x1024, rounded the measured pixel values to 1 decimal place, and compressed them using the Lempel-Ziv-Welch lossless compression algorythm. Fully commented code is provided.