January 28, 2025 Dataset Open Access

Rox, Hannes; Ränke, Fabian; Zschach, Lis Geraldine; Yang, Xuegeng; Mutschke, Gerd; Eckert, Kerstin; Lasagni, Andrés Fabián; Baumann, Robert

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    <subfield code="a">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).</subfield>
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    <subfield code="a">Ränke, Fabian</subfield>
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    <subfield code="a">Alkaline water electrolysis</subfield>
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    <subfield code="a">Hydrogen evolution reaction</subfield>
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    <subfield code="a">Bubble dynamics</subfield>
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    <subfield code="a">Dual wetting</subfield>
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    <subfield code="a">&lt;p&gt;Tuning the electrode surfaces for better bubble management is a promising approach to increase the efficiency of alkaline water electrolysis. Therefore, Direct Laser Writing was used to structure Nickel electrodes with a dual wetting surface. The applied pillar-like structure combines superhydrophilic behavior and strong spreading of the liquid across the electrode with hydrophobic bubble nucleation sites. In addition, the electrochemically active surface area is increased by a factor of 9. As a result, the overpotential has been significantly reduced, while the size of the detached bubble has increased. The present data set compares three different electrodes, a non-structured reference electrode and two laser structured electrodes with different depths of the structure, at applied current densities of&lt;strong&gt; &lt;em&gt;j&lt;/em&gt; = -20, -50 and -100 mA/cm&amp;sup2;&lt;/strong&gt; in terms of electrode potential, detached bubble size and number of nucleation sites. As electrolyte &lt;strong&gt;1 M KOH&lt;/strong&gt; was used. All experiments were carried out under ambient conditions (&lt;strong&gt;&lt;em&gt;T&lt;/em&gt; = 293 K,&lt;em&gt;p&lt;/em&gt; = 1 bar&lt;/strong&gt;).&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Description of &lt;em&gt;Data.zip&lt;/em&gt;:&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;An overview of all performed experiments is given in the file &lt;strong&gt;&lt;em&gt;Summary.csv&lt;/em&gt;&lt;/strong&gt;. The data is analyzed as described in the corresponding journal publication &lt;strong&gt;&lt;em&gt;Dual wetting electrode surfaces for alkaline water electrolysis&lt;/em&gt;&lt;/strong&gt;. 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:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Electrochemical Measurement Data
	&lt;ul&gt;
		&lt;li&gt;Galvanostatic Measurement Data&lt;/li&gt;
		&lt;li&gt;CV double-layer capacitance&lt;/li&gt;
		&lt;li&gt;LSV onset potential&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Results
	&lt;ul&gt;
		&lt;li&gt;Detected Bubbles Sideview&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;&lt;em&gt;Sideview Raw Images (only for &lt;strong&gt;SH2_LS_Pil_01.hdf5&lt;/strong&gt;)&lt;/em&gt;&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;With the exception of a single comprehensive data set comprising unprocessed images (&lt;strong&gt;SH2_LS_Pil_01.hdf5&lt;/strong&gt;), the remaining raw images from all performed measurements can be made available upon request.&lt;/p&gt;</subfield>
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