M3C (M: Fe, Co, Ni) Nanocrystals Encased in Graphene Nanoribbons : An Active and Stable Bifunctional Electrocatalyst for Oxygen Reduction and Hydrogen Evolution Reactions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiujun Fan
  • Zhiwei Peng
  • Ruquan Ye
  • Haiqing Zhou
  • Xia Guo

Detail(s)

Original languageEnglish
Pages (from-to)7407-7418
Journal / PublicationACS Nano
Volume9
Issue number7
Online published30 Jun 2015
Publication statusPublished - 28 Jul 2015
Externally publishedYes

Abstract

Transition metal carbide nanocrystalline M3C (M: Fe, Co, Ni) encapsulated in graphitic shells supported with vertically aligned graphene nanoribbons (VA-GNRs) are synthesized through a hot filament chemical vapor deposition (HF-CVD) method. The process is based on the direct reaction between iron group metals (Fe, Co, Ni) and carbon source, which are facilely get high purity carbide nanocrystals (NCs) and avoid any other impurity at relatively low temperature. The M3C-GNRs exhibit superior enhanced electrocatalystic activity for oxygen reduction reaction (ORR), including low Tafel slope (39, 41, and 45 mV dec-1 for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively), positive onset potential (∼0.8 V), high electron transfer number (∼4), and long-term stability (no obvious drop after 20 000 s test). The M3C-GNRs catalyst also exhibits remarkable hydrogen evolution reaction (HER) activity with a large cathodic current density of 166.6, 79.6, and 116.4 mA cm-2 at an overpotential of 200 mV, low onset overpotential of 32, 41, and 35 mV, small Tafel slope of 46, 57, and 54 mV dec-1 for Fe3C-GNRs, Co3C-GNRs, and Ni3C-GNRs, respectively, as well as an excellent stability in acidic media.

Research Area(s)

  • hydrogen evolution reaction (HER), M3C (M: Fe Co Ni), nanocrystals (NCs), oxygen reduction reaction (ORR), vertically aligned graphene nanoribbons (VA-GNRs)

Citation Format(s)

M3C (M: Fe, Co, Ni) Nanocrystals Encased in Graphene Nanoribbons : An Active and Stable Bifunctional Electrocatalyst for Oxygen Reduction and Hydrogen Evolution Reactions. / Fan, Xiujun; Peng, Zhiwei; Ye, Ruquan; Zhou, Haiqing; Guo, Xia.

In: ACS Nano, Vol. 9, No. 7, 28.07.2015, p. 7407-7418.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review