A5046860557- Fluid Dynamics and Mixing
- Electrodeposition and Electroless Coatings
- Hybrid Renewable Energy Systems
- Electrochemical Analysis and Applications
- Particle Dynamics in Fluid Flows
- Electrocatalysts for Energy Conversion
- Transition Metal Oxide Nanomaterials
- Fuel Cells and Related Materials
- Advanced Battery Technologies Research
- Electronic and Structural Properties of Oxides
- Electrohydrodynamics and Fluid Dynamics
- Spacecraft and Cryogenic Technologies
- Analytical Chemistry and Sensors
- Granular flow and fluidized beds
- Coal Combustion and Slurry Processing
- Cyclone Separators and Fluid Dynamics
- Semiconductor materials and devices
- Minerals Flotation and Separation Techniques
- Advanced battery technologies research
Helmholtz-Zentrum Dresden-Rossendorf
2021-2025
Technische Universität Dresden
2025
The growth of single hydrogen bubbles at micro-electrodes is studied in an acidic electrolyte over a wide range concentrations and cathodic potentials. New bubble regimes have been identified which differ terms whether the evolution proceeds presence monotonic or oscillatory variation electric current carpet microbubbles underneath bubble. Key features such as law radius, dynamics microbubble carpet, onset time oscillations oscillation frequencies characterized function concentration...
Emerging manufacturing technologies make it possible to design the morphology of electrocatalysts on nanoscale in order improve their efficiency electrolysis processes. The current work investigates effects electrode-attached hydrogen bubbles performance electrodes depending surface and wettability. Ni-based with hydrophilic hydrophobic nanostructures are manufactured by electrodeposition, properties characterized. Despite a considerably larger electrochemically active area, electrochemical...
Laser-structuring techniques like Direct Laser Interference Patterning show great potential for optimizing electrodes water electrolysis. Therefore, a systematic experimental study is performed to analyze the influence of spatial period and aspect ratio between structure depth on electrode performance pure Ni electrodes. Using statistical design experiments approach, it found that distance laser-structures decisive processing parameter improvement performance. Thus, electrochemically active...
Electrochemical water splitting leads to variations in the electrolyte concentration which might impact surface tension at both hydrogen and oxygen bubbles. Although potentially resulting solutal Marangoni convection has been predicted, it not yet observed experiments. To discover convection, potential applied during evolution reaction microelectrodes, as well concentration, have systematically varied. capture bubble dynamics local of refractive index, a combination high-speed shadowgraphy,...
A novel Y-shaped membraneless flow-through electrolyzer is introduced to achieve a homogeneous electrochemical reaction across the entire electrode in cost-efficient cell design with effective product separation. Numerical simulations of electrolyte flow and electrical current within already known I- T-shaped cells motivate newly proposed Y-shape cell. Furthermore, new criterion developed based on balance between bubble removal gas generation. As proof-of-concept experimental results using...
Improved understandings of two-phase transport in electrochemical gas-evolving systems are increasingly demanded, while high-performance imaging techniques using simplified instrumentations not readily available. This work presents volumetric scanning acoustic microscopy (SAM) for quantifying the dynamics gas bubbles and electrolyte porous Nickel electrodes with different wettability structures during alkaline water electrolysis (AWE). We realize high-resolution 3D at 10's um level high...
Laser-structuring techniques like Direct Laser Interference Patterning show great potential for optimizing electrodes water electrolysis. Therefore, a systematic experimental study based on statistical design of experiments is performed to analyze the influence spatial period and aspect ratio between structure depth electrode performance pure Ni electrodes. The electrochemically active surface area could be increased by factor 12 compared non-structured electrode. For oxygen evolution...
A novel 3-electrode cell type is introduced to run parametrical studies of H$_2$ evolution in an alkaline electrolyte on porous electrodes. Electrochemical methods combined with a high-speed optical measurement system are applied simultaneously characterize the electrodes and bubble dynamics terms size distribution coverage working electrode. Three different cathodes made expanded nickel investigated at current densities |j| = 10 200 mA cm$^{-2}$ without forced flow rate 5 ml min$^{-1}$. The...