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Design of 2D Nanocrystalline Fe2Ni2N Coated onto Graphene Nanohybrid Sheets for Efficient Electrocatalytic Oxygen Evolution

Journal Article


Abstract


  • We report successfully synthesizing two-dimensional (2D) and nanocrystalline (NC) Fe2Ni2N/rGO nanohybrid sheets (NHSs) via ammonolysis of as-prepared 2D Ni2.25Fe0.75[Fe(CN)6]2/rGO precursors. We compared the electrochemical properties of the 2D-NC Fe2Ni2N/rGO NHSs as non-precious-metal nitride and graphene nanohybrid electrocatalysts for an oxygen evolution reaction (OER) with those of NiFe-based composition. The overpotential and Tafel plot of the 2D-NC Fe2Ni2N/rGO NHSs had their lowest values of 290 and 49.1 mV dec-1, respectively, at a current density of 10 mA cm-2 (0.1 M, KOH). The 2D-NC Fe2Ni2N/rGO NHS catalyst was stable under OER conditions, and X-ray photoelectron spectroscopy and scanning transmission electron microscopy confirmed the stability of the catalysts after electrochemical testing (24 h). The synergistic interactions between the transition-metal nitride and graphene represent unique 2D nanostructured, metallic properties, and graphene sheets with nanocrystalline Fe2Ni2N on them are significantly more efficient and active electrocatalysts. The presented strategy of transition-metal nitride/graphene hybrid nanostructures provides potential for more efficient and outstanding OER electrocatalysts.

Authors


  •   Kwag, Sung Hoon. (external author)
  •   Lee, Yang Soo. (external author)
  •   Lee, Jooyoung (external author)
  •   Jeong, Dong (external author)
  •   Kwon, Seok Bin. (external author)
  •   Yoo, Jung Hyeon. (external author)
  •   Woo, Seongwon (external author)
  •   Lim, Byeong (external author)
  •   Park, Won (external author)
  •   Kim, Min-Jun (external author)
  •   Kim, Jung Ho
  •   Lim, Byungkwon (external author)
  •   Kang, Bong Kyun. (external author)
  •   Yang, Woo Seok. (external author)
  •   Yoon, Dae (external author)

Publication Date


  • 2019

Citation


  • Kwag, S. Hoon., Lee, Y. Soo., Lee, J., Jeong, D. In., Kwon, S. Bin., Yoo, J. Hyeon., Woo, S., Lim, B. Seok., Park, W. Kyu., Kim, M., Kim, J., Lim, B., Kang, B. Kyun., Yang, W. Seok. & Yoon, D. Ho. (2019). Design of 2D Nanocrystalline Fe2Ni2N Coated onto Graphene Nanohybrid Sheets for Efficient Electrocatalytic Oxygen Evolution. ACS Applied Energy Materials, Online First 1-9.

Scopus Eid


  • 2-s2.0-85074710554

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3945

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Volume


  • Online First

Place Of Publication


  • United States

Abstract


  • We report successfully synthesizing two-dimensional (2D) and nanocrystalline (NC) Fe2Ni2N/rGO nanohybrid sheets (NHSs) via ammonolysis of as-prepared 2D Ni2.25Fe0.75[Fe(CN)6]2/rGO precursors. We compared the electrochemical properties of the 2D-NC Fe2Ni2N/rGO NHSs as non-precious-metal nitride and graphene nanohybrid electrocatalysts for an oxygen evolution reaction (OER) with those of NiFe-based composition. The overpotential and Tafel plot of the 2D-NC Fe2Ni2N/rGO NHSs had their lowest values of 290 and 49.1 mV dec-1, respectively, at a current density of 10 mA cm-2 (0.1 M, KOH). The 2D-NC Fe2Ni2N/rGO NHS catalyst was stable under OER conditions, and X-ray photoelectron spectroscopy and scanning transmission electron microscopy confirmed the stability of the catalysts after electrochemical testing (24 h). The synergistic interactions between the transition-metal nitride and graphene represent unique 2D nanostructured, metallic properties, and graphene sheets with nanocrystalline Fe2Ni2N on them are significantly more efficient and active electrocatalysts. The presented strategy of transition-metal nitride/graphene hybrid nanostructures provides potential for more efficient and outstanding OER electrocatalysts.

Authors


  •   Kwag, Sung Hoon. (external author)
  •   Lee, Yang Soo. (external author)
  •   Lee, Jooyoung (external author)
  •   Jeong, Dong (external author)
  •   Kwon, Seok Bin. (external author)
  •   Yoo, Jung Hyeon. (external author)
  •   Woo, Seongwon (external author)
  •   Lim, Byeong (external author)
  •   Park, Won (external author)
  •   Kim, Min-Jun (external author)
  •   Kim, Jung Ho
  •   Lim, Byungkwon (external author)
  •   Kang, Bong Kyun. (external author)
  •   Yang, Woo Seok. (external author)
  •   Yoon, Dae (external author)

Publication Date


  • 2019

Citation


  • Kwag, S. Hoon., Lee, Y. Soo., Lee, J., Jeong, D. In., Kwon, S. Bin., Yoo, J. Hyeon., Woo, S., Lim, B. Seok., Park, W. Kyu., Kim, M., Kim, J., Lim, B., Kang, B. Kyun., Yang, W. Seok. & Yoon, D. Ho. (2019). Design of 2D Nanocrystalline Fe2Ni2N Coated onto Graphene Nanohybrid Sheets for Efficient Electrocatalytic Oxygen Evolution. ACS Applied Energy Materials, Online First 1-9.

Scopus Eid


  • 2-s2.0-85074710554

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3945

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Volume


  • Online First

Place Of Publication


  • United States