Enhanced oxygen reduction from the insertion of cobalt into nitrogen-doped porous carbons

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This work addresses unprecedentedly enhanced electrocatalytic activity of oxygen reduction reaction (ORR) by potassium hydroxide (KOH) chemical activation and cobalt doping of nitrogen-doped porous carbon (NPC). Polyacrylonitrile (PAN) and cobalt acetate are used as carbon-nitrogen and cobalt precursors to synthesize the cobalt-doped NPC. The KOH activation primarily enhances the activity of NPCs in the ORR by making them highly porous and forming pyrrolic nitrogen in the carbon network. It is the subsequent cobalt doping process that not only induces more transitions of pyridinic to pyrrolic nitrogen but also generates new active sites of oxide and carbide forms (Co3O4 and CoxC) on the NPCs. A further reduction of hydrogen peroxide can occur on the cobalt-doped NPCs leading more favorably to the four electron pathway. The cobalt-doped NPC has an ORR activity comparable to the commercial Pt catalyst, but it shows higher stability and greater tolerance to methanol poisoning.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2015-09
Language
English
Article Type
Article
Keywords

HEAT-TREATED POLYACRYLONITRILE; HIGH ELECTROCATALYTIC ACTIVITY; NONPRECIOUS METAL CATALYST; FUEL-CELLS; EVOLUTION REACTIONS; BIFUNCTIONAL ELECTROCATALYST; FACILE SYNTHESIS; GRAPHENE; SITE; NANOCOMPOSITES

Citation

RSC ADVANCES, v.5, no.107, pp.87971 - 87980

ISSN
2046-2069
DOI
10.1039/c5ra15635a
URI
http://hdl.handle.net/10203/205335
Appears in Collection
CBE-Journal Papers(저널논문)
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