Raw data for closed-loop optimization of Ni-Mo electrocatalysts for HER.

## Dataset DescriptionThis dataset contains experimental data from the optimization of Ni–Mo electrocatalysts using a closed-loop Bayesian optimization framework.## Folder StructureThe data is organized by optimization strategy. The following strategies are included:- Upper Confidence Bound (UCB), β = 1 - Upper Confidence Bound (UCB), β = 5 - Hybrid approach (combining UCB with varying β and Max Value Entropy Search) - Random search using different random seeds (1 & 42)Each strategy is stored in a separate top-level folder. Please open each .zip file. Within each strategy folder, data is further organized into individual experiment folders, where each folder corresponds to a single experimental run. In each folder using ML, there is also an ML folder where the suggested experiments as well as the calculated average overpotentials are for the optimization runs. Contents of Each Experiment FolderEach experiment folder contains the following files:1. Parameter FileA JSON file describing the experimental parameters used for the run. File naming convention: Exp_<day><month><year><hour><minute>_parameter_dict.json Example: Exp_29_01_06_2025_15_41_parameter_dict.json This file contains all parameters used to define the experimental conditions.2. Raw Experimental DataA CSV file containing the recorded electrochemical measurements. File naming convention: Testing_data_<day><month><year><hour><minute>_exp<number>.csv Example: Testing_data_01_06_2025_15_41__exp_35.csv 3. Temperature DataTemperature measurements recorded during the experiment are stored in: temperature_data.json Raw Data FormatThe raw experimental CSV files contain the following columns:- **Step name** -Name of the experimental protocol step - **Step number** -Numerical index identifying the step - **Timestamp** -Time recorded during the experiment - **Working Electrode Voltage [V]** -Applied voltage at the working electrode - **Current [A]** -Measured current - **Frequency [Hz]** -Frequency (relevant for impedance measurements) - **Re_Z** -Real component of impedance - **Im_Z**- Imaginary component of impedance - **Absolute timestamp** -Absolute time reference - **Scan rate** -Intended scan rate (see note below) Additional Notes- The **experimental protocol** is defined by the *Step name*, while the *Step number* serves as its index.- The **scan rate column is included but does not contain valid data**, as it could not be recorded during experimentation.- All timestamps in filenames correspond to the time at which the experiment was executed.- There are also .png files in each folder showing ECSA, GEIS and stability cycling as well