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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MDPI AG
2021-10-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/11/1322 |
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| author | Osami Seri Kazunao Furumata |
| author_facet | Osami Seri Kazunao Furumata |
| author_sort | Osami Seri |
| collection | DOAJ |
| description | 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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| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T05:38:33Z |
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| spelling | doaj.art-a40d71a757eb427da88dfbf4fedd5a412023-11-22T22:45:29ZengMDPI AGCatalysts2073-43442021-10-011111132210.3390/catal11111322Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization CurveOsami Seri0Kazunao Furumata1Department of Mechanical System Engineering, Muroran Institute of Technology, 27-Mizumoto-cho, Muroran 050-8585, JapanProduction System Engineering, National Institute of Technology, Hakodate College, Hakodate 042-8501, JapanThe 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.https://www.mdpi.com/2073-4344/11/11/1322hydrogen evolution reactionplatinum electrodeCO poisoningpolarization resistance curveTafel slope |
| spellingShingle | Osami Seri Kazunao Furumata Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve Catalysts hydrogen evolution reaction platinum electrode CO poisoning polarization resistance curve Tafel slope |
| title | Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve |
| title_full | Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve |
| title_fullStr | Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve |
| title_full_unstemmed | Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve |
| title_short | Poisoning Effect of CO: How It Changes Hydrogen Electrode Reaction and How to Analyze It Using Differential Polarization Curve |
| title_sort | poisoning effect of co how it changes hydrogen electrode reaction and how to analyze it using differential polarization curve |
| topic | hydrogen evolution reaction platinum electrode CO poisoning polarization resistance curve Tafel slope |
| url | https://www.mdpi.com/2073-4344/11/11/1322 |
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