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Issue 24, 2012
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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

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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 °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 m2 g−1. The XRD, XPS-C1s, and Raman spectroscopy results reveal that the crystallinity and degree of the sp2-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.

Graphical abstract: 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

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Publication details

The article was received on 21 Feb 2012, accepted on 02 Apr 2012 and first published on 02 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM31079A
J. Mater. Chem., 2012,22, 12107-12115

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    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

    C. H. Choi, S. H. Park and S. I. Woo, J. Mater. Chem., 2012, 22, 12107
    DOI: 10.1039/C2JM31079A

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