Co- and defect-rich carbon nanofiber films as a highly efficient electrocatalyst for oxygen reduction

Il To Kim, Myeong Jun Song, Seoyoon Shin, Moo Whan Shin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Many efforts are continuously devoted to developing high-efficiency, low-cost, and highly scalable oxygen reduction reaction (ORR) electrocatalysts to replace precious metal catalysts. Herein, we successfully synthesize Co- and defect-rich carbon nanofibers (CNFs) using an efficient heat treatment approach involving the pyrolysis of electrospun fibers at 370 °C under air. The heat treatment process produces Co-decorated CNFs with a high Co mass ratio, enriched pyridinic N, Co-pyridinic N x clusters, and defect-rich carbon structures. The synergistic effects from composition and structural changes in the designed material increase the number of catalytically active sites for the ORR in an alkaline solution. The prepared Co- and defect-rich CNFs exhibit excellent ORR activities with a high ORR onset potential (0.954 V vs. RHE), a large reduction current density (4.426 mA cm −2 at 0.40 V), and a nearly four-electron pathway. The catalyst also exhibits a better long-term durability than commercial Pt/C catalysts. This study provides a novel hybrid material as an efficient ORR catalyst and important insight into the design strategy for CNF-based hybrid materials as electrochemical electrodes.

Original languageEnglish
Pages (from-to)1159-1167
Number of pages9
JournalApplied Surface Science
Volume435
DOIs
Publication statusPublished - 2018 Mar 30

Fingerprint

Carbon nanofibers
Electrocatalysts
Oxygen
Defects
Catalysts
Hybrid materials
Electrochemical electrodes
Heat treatment
Precious metals
Durability
Pyrolysis
Current density
Carbon
Thermodynamic properties
Electrons
Fibers
Air
Chemical analysis
Costs

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

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abstract = "Many efforts are continuously devoted to developing high-efficiency, low-cost, and highly scalable oxygen reduction reaction (ORR) electrocatalysts to replace precious metal catalysts. Herein, we successfully synthesize Co- and defect-rich carbon nanofibers (CNFs) using an efficient heat treatment approach involving the pyrolysis of electrospun fibers at 370 °C under air. The heat treatment process produces Co-decorated CNFs with a high Co mass ratio, enriched pyridinic N, Co-pyridinic N x clusters, and defect-rich carbon structures. The synergistic effects from composition and structural changes in the designed material increase the number of catalytically active sites for the ORR in an alkaline solution. The prepared Co- and defect-rich CNFs exhibit excellent ORR activities with a high ORR onset potential (0.954 V vs. RHE), a large reduction current density (4.426 mA cm −2 at 0.40 V), and a nearly four-electron pathway. The catalyst also exhibits a better long-term durability than commercial Pt/C catalysts. This study provides a novel hybrid material as an efficient ORR catalyst and important insight into the design strategy for CNF-based hybrid materials as electrochemical electrodes.",
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Co- and defect-rich carbon nanofiber films as a highly efficient electrocatalyst for oxygen reduction. / Kim, Il To; Song, Myeong Jun; Shin, Seoyoon; Shin, Moo Whan.

In: Applied Surface Science, Vol. 435, 30.03.2018, p. 1159-1167.

Research output: Contribution to journalArticle

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