Bubble size distribution and electrode coverage at porous nickel electrodes in a novel 3-electrode flow-through cell
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
A novel 3-electrode cell type is introduced to run parametrical studies of H2 evolution in an alkaline electrolyte on porous electrodes. Electrochemical methods combined with a high-speed optical measurement system are applied simultaneously to characterize the electrodes and the bubble dynamics in terms of bubble size distribution and coverage of the working electrode. Three different cathodes made of expanded nickel are investigated at applied current densities of |j| = 10–200 mA cm−2 without forced flow and at a flow rate of 5 ml min−1. The applied current density is found to significantly influence both the size of detached bubbles and the surface coverage of the working electrode. The forced flow through the cathodes is found to strongly reduce the bubble size up to current densities of about 100 mA cm−2, whereas the initial transient until the cathode surface is completely covered by bubbles is only marginally affected by the flow-through.
Details
Original language | English |
---|---|
Pages (from-to) | 2892-2905 |
Number of pages | 14 |
Journal | International journal of hydrogen energy |
Volume | 48 |
Issue number | 8 |
Publication status | Published - 26 Jan 2023 |
Peer-reviewed | Yes |
Keywords
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- Additive manufacturing, Alkaline electrolysis, Bubble dynamics, Machine learning, Membraneless electrolyzer, Porous electrodes