Revealing improved electrocatalytic performances of electrochemically synthesized S and Ni doped Fe2O3 nanostructure interfaces

Daewon Lee, Ju Ye kim, Lee Seul Oh, Hyun Woo Kim, Youngmin Kim, Wongeun Yoon, Eunho Lim, Won Bae Kim, Jong Hyeok Park, Hyung Ju Kim

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1 Citation (Scopus)

Abstract

Non-precious-metal oxides provide various physical and chemical controllable properties when their composition and morphology are tuned for electrochemical applications. However, the unstable features due to catalytic degradation caused by the dissolution and agglomeration of the materials in acidic media have prevented the widespread use of these materials in electrocatalysis. We propose a facile and simple method for the synthesis of S and Ni co-doped single-crystal-like iron oxide nanorods (S,Ni_Fe2O3 NR) grown over a MoS2 substrate. The S,Ni_Fe2O3 NR catalyst demonstrated a stable current density of nearly −100 mA/cm2 when operated at a constant potential of −0.31 V (vs. SHE) without structural and chemical deformation of the material. The commercial Fe2O3 showed agglomerated particles after a stability test. In addition, the newly prepared S,Ni_Fe2O3 NR catalyst exhibited excellent catalytic HER performance with an overpotential of −92 mV (vs. SHE) to reach −10 mA/cm2 (a Tafel slope of 54 mV/dec). Our density functional theory (DFT) calculations suggest that a heterogeneously mixed surface with Ni and S atoms on the Fe2O3 surface can improve the HER performance. This work provides information about the design and development of future electrocatalysts with non-precious-metal oxides for use in an acidic environment.

Original languageEnglish
Article number152894
JournalApplied Surface Science
Volume588
DOIs
Publication statusPublished - 2022 Jun 30

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) [grant number: 2020M3H4A1A02084591]. We thank Mr. Hyung Bin Bae from the KAIST Analysis Center for Research Advancement (KARA) for the HAADF-STEM imaging and EDS elemental mapping analyses. The first author (D. L.) also thanks Dr. Joon Ha Chang from KRICT for significant discussions in HR-TEM and FFT analyses.

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) [grant number: 2020M3H4A1A02084591]. We thank Mr. Hyung Bin Bae from the KAIST Analysis Center for Research Advancement (KARA) for the HAADF-STEM imaging and EDS elemental mapping analyses. The first author (D. L.) also thanks Dr. Joon Ha Chang from KRICT for significant discussions in HR-TEM and FFT analyses.

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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