Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy
The sluggish kinetics of oxygen reduction to water remains a significant limitation in the viability of proton exchange membrane fuel cells, yet details of the four electron oxygen reduction reaction remain elusive. Here we apply in situ infrared spectroscopy to probe surface chemistry of a commerci...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Wiley‐VCH Verlag
2018
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| _version_ | 1797101200029515776 |
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| author | Nayak, S McPherson, I Vincent, K |
| author_facet | Nayak, S McPherson, I Vincent, K |
| author_sort | Nayak, S |
| collection | OXFORD |
| description | The sluggish kinetics of oxygen reduction to water remains a significant limitation in the viability of proton exchange membrane fuel cells, yet details of the four electron oxygen reduction reaction remain elusive. Here we apply in situ infrared spectroscopy to probe surface chemistry of a commercial carbon‐supported Pt nanoparticle catalyst during oxygen reduction. Infrared spectra show potential dependent appearance of adsorbed superoxide and hydroperoxide intermediates on Pt. This strongly supports an associative pathway for oxygen reduction. Analysis of the adsorbates alongside the catalytic current suggests that another pathway must also be in operation, consistent with a parallel dissociative pathway. |
| first_indexed | 2024-03-07T05:48:28Z |
| format | Journal article |
| id | oxford-uuid:e803dcdc-ce1e-41f5-8028-a1db018de92f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:48:28Z |
| publishDate | 2018 |
| publisher | Wiley‐VCH Verlag |
| record_format | dspace |
| spelling | oxford-uuid:e803dcdc-ce1e-41f5-8028-a1db018de92f2022-03-27T10:43:29ZAdsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e803dcdc-ce1e-41f5-8028-a1db018de92fEnglishSymplectic Elements at OxfordWiley‐VCH Verlag2018Nayak, SMcPherson, IVincent, KThe sluggish kinetics of oxygen reduction to water remains a significant limitation in the viability of proton exchange membrane fuel cells, yet details of the four electron oxygen reduction reaction remain elusive. Here we apply in situ infrared spectroscopy to probe surface chemistry of a commercial carbon‐supported Pt nanoparticle catalyst during oxygen reduction. Infrared spectra show potential dependent appearance of adsorbed superoxide and hydroperoxide intermediates on Pt. This strongly supports an associative pathway for oxygen reduction. Analysis of the adsorbates alongside the catalytic current suggests that another pathway must also be in operation, consistent with a parallel dissociative pathway. |
| spellingShingle | Nayak, S McPherson, I Vincent, K Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title | Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title_full | Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title_fullStr | Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title_full_unstemmed | Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title_short | Adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ IR spectroscopy |
| title_sort | adsorbed intermediates in oxygen reduction on platinum nanoparticles observed by in situ ir spectroscopy |
| work_keys_str_mv | AT nayaks adsorbedintermediatesinoxygenreductiononplatinumnanoparticlesobservedbyinsituirspectroscopy AT mcphersoni adsorbedintermediatesinoxygenreductiononplatinumnanoparticlesobservedbyinsituirspectroscopy AT vincentk adsorbedintermediatesinoxygenreductiononplatinumnanoparticlesobservedbyinsituirspectroscopy |