October 29, 2024 Dataset Open Access

Data publication: Boosting electrode performance and bubble management via Direct Laser Interference Patterning

Rox, Hannes; Ränke, Fabian; Mädler, Jonathan; Marzec, Mateusz M.; Sokolowski, Krystian; Baumann, Robert; Hamedi, Homa; Yang, Xuegeng; Mutschke, Gerd; Urbas, Leon; Lasagni, Andrés Fabián; Eckert, Kerstin

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