Differentiation between Carbon Corrosion and Oxygen Evolution Catalyzed by Ni x B/C Hybrid Electrocatalysts in Alkaline Solution using Differential Electrochemical Mass Spectrometry
| Autor: | Wolfgang Schuhmann, Sandra Möller, Corina Andronescu, Justus Masa, Stefan Barwe, Stefan Dieckhöfer |
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| Rok vydání: | 2020 |
| Předmět: |
Chemistry
020209 energy Inorganic chemistry Chemie Oxygen evolution 02 engineering and technology 021001 nanoscience & nanotechnology Mass spectrometry Electrochemistry Catalysis Carbon corrosion 13. Climate action ddc:540 0202 electrical engineering electronic engineering information engineering 0210 nano-technology Differential (mathematics) |
| Zdroj: | ChemElectroChem |
| ISSN: | 2196-0216 |
| DOI: | 10.1002/celc.202000697 |
| Popis: | Carbon is a frequently used electrode material and an important additive in catalyst films. Its corrosion is often reported during electrocatalysis at high anodic potentials, especially in acidic electrolyte. Investigation of the carbon corrosion in alkaline environment is difficult due to the CO\(_{2}\)/CO\(_{3}\)\(^{2}\)− equilibrium. We report the on-line determination of electrolysis products generated on Ni\(_{x}\)B/C hybrid electrocatalysts in alkaline electrolyte at anodic potentials using differential electrochemical mass spectrometry (DEMS). Ni\(_{x}\)B/C catalyst films were obtained from mixtures containing different ratios of NiXB and benzoxazine monomers followed by polymerization and pyrolysis. The impact of the composition of the electrocatalyst on the dominant electrolysis process allows to distinguish between the oxygen evolution reaction and carbon corrosion using DEMS results as well as the catalyst surface composition evaluated from X-ray photoelectron spectra. At the imposed highly oxidative conditions, an increasing amount of Ni\(_{x}\)B in the electrocatalyst leads to a suppression of carbon corrosion. |
| Databáze: | OpenAIRE |
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