N-doped ordered mesoporous carbons prepared by a two-step nanocasting strategy as highly active and selective electrocatalysts for the reduction of O sub(2) to H sub(2)O sub(2)

A new, two-step nanocasting method was developed to prepare N-doped ordered mesoporous carbon (NOMC) electrocatalysts for the reduction of O sub(2) to H sub(2)O sub(2). Our strategy involves the sequential pyrolysis of two inexpensive and readily available N and C precursors, i.e. aniline and dihydr...

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Veröffentlicht in:Applied catalysis. B, Environmental Environmental, 2015-10, Vol.176-177, p.212-224
Hauptverfasser: Sheng, Xia, Daems, Nick, Geboes, Bart, Kurttepeli, Mert, Bals, Sara, Breugelmans, Tom, Hubin, Annick, Vankelecom, Ivo FJ, Pescarmona, Paolo P
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Sprache:eng
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Zusammenfassung:A new, two-step nanocasting method was developed to prepare N-doped ordered mesoporous carbon (NOMC) electrocatalysts for the reduction of O sub(2) to H sub(2)O sub(2). Our strategy involves the sequential pyrolysis of two inexpensive and readily available N and C precursors, i.e. aniline and dihydroxynaphthalene (DHN), inside the pores of a SBA-15 hard silica template to obtain N-doped graphitic carbon materials with well-ordered pores and high surface areas (764 and 877 m super(2)g super(-1)). By tuning the ratio of carbon sources to silica template, it was possible to achieve an optimal filling of the pores of the SBA-15 silica and to minimise carbon species outside the pores. These NOMC materials displayed outstanding electrocatalytic activity in the oxygen reduction reaction, achieving a remarkably enhanced kinetic current density compared to state-of-the-art N-doped carbon materials (-16.7 mA cm super(-2) at -0.35 V vs. Ag/AgCl in a 0.1 M KOH solution as electrolyte). The NOMC electrocatalysts showed high selectivity toward the two-electron reduction of oxygen to hydrogen peroxide and excellent long-term stability.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2015.03.049