DC Field | Value | Language |
---|---|---|
dc.contributor.author | Choi, Chang-Hyuck | ko |
dc.contributor.author | Park, Sung-Hyeon | ko |
dc.contributor.author | Woo, Seong-Ihl | ko |
dc.date.accessioned | 2013-03-12T09:51:18Z | - |
dc.date.available | 2013-03-12T09:51:18Z | - |
dc.date.created | 2012-08-08 | - |
dc.date.created | 2012-08-08 | - |
dc.date.issued | 2012-04 | - |
dc.identifier.citation | JOURNAL OF MATERIALS CHEMISTRY, v.22, no.24, pp.12107 - 12115 | - |
dc.identifier.issn | 0959-9428 | - |
dc.identifier.uri | http://hdl.handle.net/10203/101952 | - |
dc.description.abstract | A new strategy for enhancing the oxygen reduction reaction (ORR) activity of carbon-based catalysts in acidic media is proposed and characterized; the strategy consists in modifying the ORR through dual doping of nitrogen and phosphorus into the carbon. The P, N-doped carbon is prepared via pyrolysis of a mixture composed of dicyandiamide (DCDA), phosphoric acid, cobalt chloride, and iron chloride at 900 degrees C under an Ar atmosphere. The P-doping induces an uneven surface with many open edged sites in the carbon morphology and increases the carbon surface area from 108.1 to 578.8 m(2) g(-1). The XRD, XPS-C-1s, and Raman spectroscopy results reveal that the crystallinity and degree of the sp(2)-carbon network decrease and the number of defect sites of the carbon increase as the amount of P-doping increases. All catalysts demonstrated similar proportions of N-doping types regardless of the P-doping amount: pyridinic-N and graphitic-N were dominant phases in the carbon lattice. In the ORR, the onset potential of the prepared catalysts was 0.6 V (vs. Ag/AgCl) in 1 M HClO4. The N-doped carbon records -0.69 mA mg(-1) of mass activity at 0.5 V (vs. Ag/AgCl), but additional P-doping results in an increase of activity (-2.88 mA mg(-1)) that is more than fourfold that produced without the additional P-doping. Moreover, additional P-doping also modifies the ORR pathway, as the N-doped carbon induces more than 10% of H2O2; however, the P, N-doped carbon produced below 4% of H2O2 during the ORR. | - |
dc.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.subject | MEMBRANE FUEL-CELLS | - |
dc.subject | METAL-FREE ELECTROCATALYSTS | - |
dc.subject | X-RAY PHOTOELECTRON | - |
dc.subject | O-2 REDUCTION | - |
dc.subject | COMPOSITE CATALYSTS | - |
dc.subject | ACTIVE-SITES | - |
dc.subject | NANOTUBES | - |
dc.subject | DURABILITY | - |
dc.subject | IRON | - |
dc.subject | SPECTROSCOPY | - |
dc.title | Phosphorus-nitrogen dual doped carbon as an effective catalyst for oxygen reduction reaction in acidic media: effects of the amount of P-doping on the physical and electrochemical properties of carbon | - |
dc.type | Article | - |
dc.identifier.wosid | 000304561900034 | - |
dc.identifier.scopusid | 2-s2.0-84862233148 | - |
dc.type.rims | ART | - |
dc.citation.volume | 22 | - |
dc.citation.issue | 24 | - |
dc.citation.beginningpage | 12107 | - |
dc.citation.endingpage | 12115 | - |
dc.citation.publicationname | JOURNAL OF MATERIALS CHEMISTRY | - |
dc.identifier.doi | 10.1039/c2jm31079a | - |
dc.contributor.localauthor | Woo, Seong-Ihl | - |
dc.contributor.nonIdAuthor | Park, Sung-Hyeon | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | MEMBRANE FUEL-CELLS | - |
dc.subject.keywordPlus | METAL-FREE ELECTROCATALYSTS | - |
dc.subject.keywordPlus | X-RAY PHOTOELECTRON | - |
dc.subject.keywordPlus | O-2 REDUCTION | - |
dc.subject.keywordPlus | COMPOSITE CATALYSTS | - |
dc.subject.keywordPlus | ACTIVE-SITES | - |
dc.subject.keywordPlus | NANOTUBES | - |
dc.subject.keywordPlus | DURABILITY | - |
dc.subject.keywordPlus | IRON | - |
dc.subject.keywordPlus | SPECTROSCOPY | - |
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