Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes
A NiOx/Pt nanostructured catalyst was developed on a glassy carbon substrate that was functionalized with “mutli-walled” carbon nanotubes (CNTs) for the electro-oxidation of formic acid (EOFA); the essential oxidation reaction in the direct formic acid fuel cells (DFAFCs). The sequential deposition...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535221003981 |
| _version_ | 1818664363297341440 |
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| author | Islam M. Al-Akraa Ahmed E. Salama Yaser M. Asal Ahmad M. Mohammad |
| author_facet | Islam M. Al-Akraa Ahmed E. Salama Yaser M. Asal Ahmad M. Mohammad |
| author_sort | Islam M. Al-Akraa |
| collection | DOAJ |
| description | A NiOx/Pt nanostructured catalyst was developed on a glassy carbon substrate that was functionalized with “mutli-walled” carbon nanotubes (CNTs) for the electro-oxidation of formic acid (EOFA); the essential oxidation reaction in the direct formic acid fuel cells (DFAFCs). The sequential deposition technique was adapted for the electrodeposition of platinum (n-Pt) and nickel oxide (n-NiOx) nanoparticles onto a CNTs-functionalized glassy carbon (GC) substrate. The presence of CNTs in the catalyst restricted the deposition of n-Pt and n-NiOx mostly onto their walls. Interestingly, this NiOx/Pt/CNTs/GC catalyst displayed a significant enhancement in the catalytic activity toward EOFA. This occurred by driving the reaction mechanism exclusively via the desirable direct dehydrogenation pathway with a large (−116 mV) shift (relative to that of the Pt/GC catalyst) in the onset potential with a complete suppression for the undesirable poisoning dehydration route. It also offered a much (up to 5-fold) better tolerance against the CO poisoning that normally deteriorates the performance of the DFAFCs. The electrochemical impedance spectroscopy and the Tafel representations agreed on the effective role of n-NiOx in improving the electronic properties of Pt at the surface. On parallel, an oxidative stripping voltammetry of CO from the NiOx/Pt/CNTs/GC catalyst confirmed the potential geometrical influence of CNTs in the divergence of n-Pt that mitigated the CO poisoning. |
| first_indexed | 2024-12-17T05:31:33Z |
| format | Article |
| id | doaj.art-9f502b168289408b83d192c6944bd14a |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-17T05:31:33Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-9f502b168289408b83d192c6944bd14a2022-12-21T22:01:43ZengElsevierArabian Journal of Chemistry1878-53522021-10-011410103383Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubesIslam M. Al-Akraa0Ahmed E. Salama1Yaser M. Asal2Ahmad M. Mohammad3Department of Chemical Engineering, Faculty of Engineering, The British University in Egypt, Cairo 11837, Egypt; Corresponding author.Department of Chemical Engineering, Faculty of Engineering, The British University in Egypt, Cairo 11837, EgyptDepartment of Chemical Engineering, Faculty of Engineering, The British University in Egypt, Cairo 11837, EgyptChemistry Department, Faculty of Science, Cairo University, Cairo 12613, EgyptA NiOx/Pt nanostructured catalyst was developed on a glassy carbon substrate that was functionalized with “mutli-walled” carbon nanotubes (CNTs) for the electro-oxidation of formic acid (EOFA); the essential oxidation reaction in the direct formic acid fuel cells (DFAFCs). The sequential deposition technique was adapted for the electrodeposition of platinum (n-Pt) and nickel oxide (n-NiOx) nanoparticles onto a CNTs-functionalized glassy carbon (GC) substrate. The presence of CNTs in the catalyst restricted the deposition of n-Pt and n-NiOx mostly onto their walls. Interestingly, this NiOx/Pt/CNTs/GC catalyst displayed a significant enhancement in the catalytic activity toward EOFA. This occurred by driving the reaction mechanism exclusively via the desirable direct dehydrogenation pathway with a large (−116 mV) shift (relative to that of the Pt/GC catalyst) in the onset potential with a complete suppression for the undesirable poisoning dehydration route. It also offered a much (up to 5-fold) better tolerance against the CO poisoning that normally deteriorates the performance of the DFAFCs. The electrochemical impedance spectroscopy and the Tafel representations agreed on the effective role of n-NiOx in improving the electronic properties of Pt at the surface. On parallel, an oxidative stripping voltammetry of CO from the NiOx/Pt/CNTs/GC catalyst confirmed the potential geometrical influence of CNTs in the divergence of n-Pt that mitigated the CO poisoning.http://www.sciencedirect.com/science/article/pii/S1878535221003981Formic acidPlatinumNickel oxideCarbon nanotubesPoisoningFuel cells |
| spellingShingle | Islam M. Al-Akraa Ahmed E. Salama Yaser M. Asal Ahmad M. Mohammad Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes Arabian Journal of Chemistry Formic acid Platinum Nickel oxide Carbon nanotubes Poisoning Fuel cells |
| title | Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes |
| title_full | Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes |
| title_fullStr | Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes |
| title_full_unstemmed | Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes |
| title_short | Boosted performance of NiOx/Pt nanocatalyst for the electro-oxidation of formic acid: A substrate's functionalization with multi-walled carbon nanotubes |
| title_sort | boosted performance of niox pt nanocatalyst for the electro oxidation of formic acid a substrate s functionalization with multi walled carbon nanotubes |
| topic | Formic acid Platinum Nickel oxide Carbon nanotubes Poisoning Fuel cells |
| url | http://www.sciencedirect.com/science/article/pii/S1878535221003981 |
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