Direct Laser Intereference Patterning is a promising approach to structure electrodes for alkaline water electrolysis to improve the electrode performance. By increasing the electrochemical active surface area and apply a superhydrophilic surface structure, the overpotential could be decreased significantly. The present data set compares three different spatial period and aspect ratios, defined as the ratio between structure depth and period, at applied current densities of j = 10, 31.62 and 100 mA/cm² in terms of electrode potential, detached bubble size and number of nucleation sites. As electrolyte 1 M KOH was used. All experiments were carried out under ambient conditions (T = 293 K,p = 1 bar).

A.) Description of Data.zip:

An overview of all performed experiments is given in the file Summary.csv. The data is analyzed as described in the corresponding journal publication Boosting electrode performance and bubble management via Direct Laser Interference Patterning. Each data set is stored in a .hdf5-file, with the relevant metadata incorporated into the attributes assigned to the groups/datasets within the .hdf5-file. The data files are structured in groups as follows:

Electrochemical Measurement Data

    Galvanostatic Measurement Data
    CV double-layer capacitance
    LSV onset potential


Results

    Detected Bubbles Sideview
    Detected Bubbles Topview


Sideview Raw Images (only for SH2_LS_DoE_01.hdf5)
Topview Raw Images (only for SH2_LS_DoE_01.hdf5)

With the exception of a single comprehensive data set comprising unprocessed images (SH2_LS_DoE_01.hdf5), the remaining raw images from all performed measurements can be made available upon request.

B.) Description of Videos.zip:

Example videos for non-structured and laser-structured electrodes at a current density of j = 100 mA/cm² are given for both, sideview and topview. The provided characteristic videos are named after following scheme:

Perspective_Electrode_CurrentDensity
E.g.: Sideview_#1_NSE_100mAcm-2

This project is supported by the Federal State of Saxony in terms of the "European Regional Development Fund" (H2-EPF-HZDR), the Helmholtz Association Innovation pool project "Solar Hydrogen", the Hydrogen Lab of the School of Engineering of TU Dresden, and BMBF (project ALKALIMIT, grant no. 03SF0731A).