Stable Acidic Water Oxidation with a Cobalt–Iron–Lead Oxide Catalyst Operating via a Cobalt‐Selective Self‐Healing Mechanism
| Autor: | Alexandr N. Simonov, Manjunath Chatti, Antonio Tricoli, Pavel V. Cherepanov, Jie Xiao, Dijon A. Hoogeveen, Marc F. Tesch, Shannon A. Bonke, James Gardiner, Douglas R. MacFarlane, Ronny Golnak, Darcy Simondson |
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| Rok vydání: | 2021 |
| Předmět: |
010405 organic chemistry
Chemistry Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology General Medicine General Chemistry Electrolyte Overpotential 021001 nanoscience & nanotechnology 010402 general chemistry Electrocatalyst Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound 0210 nano-technology Platinum Cobalt |
| Zdroj: | Angewandte Chemie International Edition. 60:15821-15826 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | The instability and expense of anodes for water electrolyzers with acidic electrolytes can be overcome through the implementation of a cobalt-iron-lead oxide electrocatalyst, [Co-Fe-Pb]Ox , that is self-healing in the presence of dissolved metal precursors. However, the latter requirement is pernicious for the membrane and especially the cathode half-reaction since Pb2+ and Fe3+ precursors poison the state-of-the-art platinum H2 evolving catalyst. To address this, we demonstrate the invariably stable operation of [Co-Fe-Pb]Ox in acidic solutions through a cobalt-selective self-healing mechanism without the addition of Pb2+ and Fe3+ and investigate the kinetics of the process. Soft X-ray absorption spectroscopy reveals that low concentrations of Co2+ in the solution stabilize the catalytically active Co(Fe) sites. The highly promising performance of this system is showcased by steady water electrooxidation at 80±1 °C and 10 mA cm-2 , using a flat electrode, at an overpotential of 0.56±0.01 V on a one-week timescale. |
| Databáze: | OpenAIRE |
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