Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media

Seung Hyo Noh, Min Ho Seo, Joonhee Kang, Takeyoshi Okajima, Byungchan Han, Takeo Ohsaka

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The identification and development of efficient catalysts made of non-precious materials for oxygen reduction reaction (ORR) are essential for the successful operation of a wide range of energy devices. This study provides evidence that earth-abundant nanoparticles of transition metals encapsulated in a nitrogen-doped carbon shell (M@N-C, M=Fe, Co, Ni, Cu or Fe alloys) are promising catalysts in acidic solutions. By density functional theory calculations and experimental validations, we quantitatively propose a method of tuning the ORR activity of M@N-C by controlling the nitrogen-doping level, the thickness of the N-C shells and binary alloying. FeCo@N-C/KB was chosen as the best ORR catalyst because of its onset and half-wave potentials of 0.92 and 0.74 V vs a reversible hydrogen electrode (RHE), respectively, and its excellent durability. Furthermore, FeCo@N-C/KB possesses a high activity for the hydrogen evolution reaction (HER; - 0.24 V vs RHE at - 10 mA cm- 2), thus demonstrating that it is a good bi-functional ORR and HER catalyst in acidic media.

Original languageEnglish
Article numbere233
JournalNPG Asia Materials
Volume8
Issue number9
DOIs
Publication statusPublished - 2016 Sep 23

Fingerprint

Catalyst
Carbon
Oxygen
catalysts
Hydrogen
Catalysts
carbon
oxygen
Nitrogen
Electrode
Shell
hydrogen
Electrodes
nitrogen
Alloying
electrodes
Durability
Transition metals
Density functional theory
Experimental Validation

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Noh, Seung Hyo ; Seo, Min Ho ; Kang, Joonhee ; Okajima, Takeyoshi ; Han, Byungchan ; Ohsaka, Takeo. / Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media. In: NPG Asia Materials. 2016 ; Vol. 8, No. 9.
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Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media. / Noh, Seung Hyo; Seo, Min Ho; Kang, Joonhee; Okajima, Takeyoshi; Han, Byungchan; Ohsaka, Takeo.

In: NPG Asia Materials, Vol. 8, No. 9, e233, 23.09.2016.

Research output: Contribution to journalArticle

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