DC Field | Value | Language |
---|---|---|
dc.contributor.author | Byon, Hye Ryung | ko |
dc.contributor.author | Suntivich, Jin | ko |
dc.contributor.author | Crumlin, Ethan J. | ko |
dc.contributor.author | Shao-Horn, Yang | ko |
dc.date.accessioned | 2016-05-12T03:05:10Z | - |
dc.date.available | 2016-05-12T03:05:10Z | - |
dc.date.created | 2016-02-17 | - |
dc.date.created | 2016-02-17 | - |
dc.date.issued | 2011-12 | - |
dc.identifier.citation | PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.13, no.48, pp.21437 - 21445 | - |
dc.identifier.issn | 1463-9076 | - |
dc.identifier.uri | http://hdl.handle.net/10203/207230 | - |
dc.description.abstract | We report a facile synthesis of Fe-N-C catalysts based on the surface functionalization of multi-walled carbon nanotubes (MWCNTs), which show high activity and stability for oxygen reduction reaction (ORR) in acid. Fe-N-MWCNT catalysts, whose ORR mass activities could vary by 3-4 times depending on the choice of Fe precursors, were found to have considerably higher ORR mass activity and higher stability than N-modified MWCNTs (N-MWCNTs). The Fe-N-MWCNT catalyst with a dominant Fe-N(x) moiety (with x approximate to 4) and a surface Fe/C ratio of similar to 0.004 exhibits the highest ORR mass activity in acid (similar to 0.7 mA mg(-1) Fe-N-MWCNT at 0.8 V vs. RHE), where the lower mass activity of other Fe-N-MWCNT catalysts can be attributed to lower Fe/C ratios and Fe-N(x) moieties (with x smaller than 4) as revealed from X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Moreover, the enhanced stability of Fe-N-MWCNTs in comparison to N-MWCNTs can be attributed to less H(2)O(2) production during ORR as determined from rotating ring disk electrode (RRDE) measurements, and higher activity for H(2)O(2) electro-reduction by rotating disk electrode (RDE) measurements. The large surface Fe/C ratio and Fe-N(x) moiety corresponding to high ORR activity and stability of Fe-N-MWCNTs demonstrate that surface functionalization can be very helpful to graft active catalytic sites onto carbon nanostructures, and to provide insights into the ORR mechanism of non-noble metal catalysts (NNMCs) for proton exchange membrane fuel cells (PEMFCs). | - |
dc.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.subject | PEM FUEL-CELLS | - |
dc.subject | HIGH ELECTROCATALYTIC ACTIVITY | - |
dc.subject | ACTIVE-SITES | - |
dc.subject | O-2 REDUCTION | - |
dc.subject | METAL ELECTROCATALYSTS | - |
dc.subject | HEAT-TREATMENT | - |
dc.subject | CATALYSTS | - |
dc.subject | ELECTROLYTE | - |
dc.subject | NITROGEN | - |
dc.subject | IRON | - |
dc.title | Fe-N-modified multi-walled carbon nanotubes for oxygen reduction reaction in acid | - |
dc.type | Article | - |
dc.identifier.wosid | 000297560200030 | - |
dc.identifier.scopusid | 2-s2.0-82655180413 | - |
dc.type.rims | ART | - |
dc.citation.volume | 13 | - |
dc.citation.issue | 48 | - |
dc.citation.beginningpage | 21437 | - |
dc.citation.endingpage | 21445 | - |
dc.citation.publicationname | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | - |
dc.identifier.doi | 10.1039/c1cp23029h | - |
dc.contributor.localauthor | Byon, Hye Ryung | - |
dc.contributor.nonIdAuthor | Suntivich, Jin | - |
dc.contributor.nonIdAuthor | Crumlin, Ethan J. | - |
dc.contributor.nonIdAuthor | Shao-Horn, Yang | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | PEM FUEL-CELLS | - |
dc.subject.keywordPlus | HIGH ELECTROCATALYTIC ACTIVITY | - |
dc.subject.keywordPlus | ACTIVE-SITES | - |
dc.subject.keywordPlus | O-2 REDUCTION | - |
dc.subject.keywordPlus | METAL ELECTROCATALYSTS | - |
dc.subject.keywordPlus | HEAT-TREATMENT | - |
dc.subject.keywordPlus | CATALYSTS | - |
dc.subject.keywordPlus | ELECTROLYTE | - |
dc.subject.keywordPlus | NITROGEN | - |
dc.subject.keywordPlus | IRON | - |
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