Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play?
The effect of the nature of the catalyst on the performance and mechanism of the hydrogen oxidation reaction (HOR) is discussed for the first time in this work. HOR is an anodic reaction that takes place in anionic exchange membrane fuel cells (AEMFCs) and hydrogen pumps (HPs). Among the investigate...
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2021
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oai:doaj.org-article:5382561bfec94392adbcfc25b110dc6d2021-11-25T18:32:53ZUltra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play?10.3390/nano111131562079-4991https://doaj.org/article/5382561bfec94392adbcfc25b110dc6d2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3156https://doaj.org/toc/2079-4991The effect of the nature of the catalyst on the performance and mechanism of the hydrogen oxidation reaction (HOR) is discussed for the first time in this work. HOR is an anodic reaction that takes place in anionic exchange membrane fuel cells (AEMFCs) and hydrogen pumps (HPs). Among the investigated catalysts, Pt exhibited the best performance in the HOR. However, the cost and the availability limit the usage. Co is incorporated as a co-catalyst due to its oxophylic nature. Five different PtCo catalysts with different Pt loading values were synthesized in order to decrease Pt loading. The catalytic activities and the reaction mechanism were studied via electrochemical techniques, and it was found that both features are a function of Pt loading; low-Pt-loading catalysts (Pt loading < 2.7%) led to a high half-wave potential in the hydrogen oxidation reaction, which is related to higher activation energy and an intermediate Tafel slope value, related to a mixed HOR mechanism. However, catalysts with moderate Pt loading (Pt loading > 3.1%) exhibited lower E<sub>1/2</sub> than the other catalysts and exhibited a mechanism similar to that of commercial Pt catalysts. Our results demonstrate that Co plays an active role in the HOR, facilitating H<sub>ads</sub> desorption, which is the rate-determining step (RDS) in the mechanism of the HOR.Felipe de Jesús Anaya-CastroMara Beltrán-GastélumOmar Morales SotoSergio Pérez-SicairosShui Wai LinBalter Trujillo-NavarreteFrancisco Paraguay-DelgadoLuis Javier Salazar-GastélumTatiana Romero-CastañónEdgar Reynoso-SotoRosa María Félix-NavarroMoisés Israel Salazar-GastélumMDPI AGarticlehydrogen oxidation reactionanodic catalystnanomaterialanionic exchange membrane fuel cellhydrogen pumpenergy storageChemistryQD1-999ENNanomaterials, Vol 11, Iss 3156, p 3156 (2021) |
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hydrogen oxidation reaction anodic catalyst nanomaterial anionic exchange membrane fuel cell hydrogen pump energy storage Chemistry QD1-999 |
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hydrogen oxidation reaction anodic catalyst nanomaterial anionic exchange membrane fuel cell hydrogen pump energy storage Chemistry QD1-999 Felipe de Jesús Anaya-Castro Mara Beltrán-Gastélum Omar Morales Soto Sergio Pérez-Sicairos Shui Wai Lin Balter Trujillo-Navarrete Francisco Paraguay-Delgado Luis Javier Salazar-Gastélum Tatiana Romero-Castañón Edgar Reynoso-Soto Rosa María Félix-Navarro Moisés Israel Salazar-Gastélum Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| description |
The effect of the nature of the catalyst on the performance and mechanism of the hydrogen oxidation reaction (HOR) is discussed for the first time in this work. HOR is an anodic reaction that takes place in anionic exchange membrane fuel cells (AEMFCs) and hydrogen pumps (HPs). Among the investigated catalysts, Pt exhibited the best performance in the HOR. However, the cost and the availability limit the usage. Co is incorporated as a co-catalyst due to its oxophylic nature. Five different PtCo catalysts with different Pt loading values were synthesized in order to decrease Pt loading. The catalytic activities and the reaction mechanism were studied via electrochemical techniques, and it was found that both features are a function of Pt loading; low-Pt-loading catalysts (Pt loading < 2.7%) led to a high half-wave potential in the hydrogen oxidation reaction, which is related to higher activation energy and an intermediate Tafel slope value, related to a mixed HOR mechanism. However, catalysts with moderate Pt loading (Pt loading > 3.1%) exhibited lower E<sub>1/2</sub> than the other catalysts and exhibited a mechanism similar to that of commercial Pt catalysts. Our results demonstrate that Co plays an active role in the HOR, facilitating H<sub>ads</sub> desorption, which is the rate-determining step (RDS) in the mechanism of the HOR. |
| format |
article |
| author |
Felipe de Jesús Anaya-Castro Mara Beltrán-Gastélum Omar Morales Soto Sergio Pérez-Sicairos Shui Wai Lin Balter Trujillo-Navarrete Francisco Paraguay-Delgado Luis Javier Salazar-Gastélum Tatiana Romero-Castañón Edgar Reynoso-Soto Rosa María Félix-Navarro Moisés Israel Salazar-Gastélum |
| author_facet |
Felipe de Jesús Anaya-Castro Mara Beltrán-Gastélum Omar Morales Soto Sergio Pérez-Sicairos Shui Wai Lin Balter Trujillo-Navarrete Francisco Paraguay-Delgado Luis Javier Salazar-Gastélum Tatiana Romero-Castañón Edgar Reynoso-Soto Rosa María Félix-Navarro Moisés Israel Salazar-Gastélum |
| author_sort |
Felipe de Jesús Anaya-Castro |
| title |
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| title_short |
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| title_full |
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| title_fullStr |
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| title_full_unstemmed |
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play? |
| title_sort |
ultra-low pt loading in ptco catalysts for the hydrogen oxidation reaction: what role do co nanoparticles play? |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/5382561bfec94392adbcfc25b110dc6d |
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