Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve
The hydrogen electrode reaction (<i>HER</i>) on Pt electrode in a H<sub>2</sub>SO<sub>4</sub> solution when CO gas was injected/stopped was studied using polarization resistance curve. In order to elucidate and confirm the CO poisoning effect, a few curve techniqu...
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| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/a40d71a757eb427da88dfbf4fedd5a41 |
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| Sumario: | The hydrogen electrode reaction (<i>HER</i>) on Pt electrode in a H<sub>2</sub>SO<sub>4</sub> solution when CO gas was injected/stopped was studied using polarization resistance curve. In order to elucidate and confirm the CO poisoning effect, a few curve techniques were proposed. Applying them, the kinetic parameters such as the number of electrons transferred (<i>z</i>) and the cathodic transfer coefficient (<i>α</i><sub>c</sub>) were determined. The <i>HER</i> in a 0.5 mol dm<sup>−3</sup> H<sub>2</sub>SO<sub>4</sub> solution saturated with H<sub>2</sub> was confirmed as a reversible reaction having <i>z</i> = 2. When the above solution was injected with CO, the reversible <i>HER</i> changed to an irreversible reaction having <i>z</i> = 1 and <i>α</i><sub>c</sub> ≈ 0.6. Once we stopped the CO injection, alteration from the irreversible to quasireversible reaction was gradually made after several cyclic polarizations. The proposed curve techniques can provide a reliable way to determine the kinetic parameters changing among reversible, irreversible, and quasireversible reactions. |
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