Overcoming the Instability of Nanoparticle-Based Catalyst Films in Alkaline Electrolyzers by using Self-Assembling and Self-Healing Films
| Autor: | Justus Masa, Stefan Barwe, Wolfgang Schuhmann, Corina Andronescu, Edgar Ventosa, Bastian Mei |
|---|---|
| Přispěvatelé: | Photocatalytic Synthesis |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Catalyst support Nanoparticle Nanotechnology 02 engineering and technology Electrolyte 010402 general chemistry 01 natural sciences Catalysis Nanopowder catalyst law.invention law Water splitting Self-healing films Electrolysis Alkaline water electrolysis Self-assembly General Chemistry 021001 nanoscience & nanotechnology n/a OA procedure Cathode 0104 chemical sciences Anode Chemical engineering Electrocatalysis 0210 nano-technology |
| Zdroj: | Angewandte Chemie (international edition), 56(29), 8573-8577. Wiley |
| ISSN: | 1433-7851 |
| Popis: | Engineering stable electrodes using highly active catalyst nanopowders for electrochemical water splitting remains a notorious challenge. We report an innovative and general approach for attaining highly stable catalyst films with self-healing capability based on in-situ self-assembly of catalyst particles during electrolysis. The catalyst particles are added to the electrolyte forming a suspension that is pumped through the electrolyzer. Particles with negatively charged surfaces stick onto the anode, while particles with positively charged surfaces stick to the cathode. The self-assembled catalyst films possess self-healing properties as long as a sufficient amount of catalyst particles are present in the electrolyte. The proof-of-concept was demonstrated in a non-zero gap alkaline electrolyzer using NiFe LDH and NixB catalyst nanopowders for anode and cathode, respectively. Steady cell voltages were maintained for at least three weeks during continuous electrolysis at 50-100 mA cm-2 |
| Databáze: | OpenAIRE |
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