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Enhanced visible-light photocatalytic performance of Fe3O4 nanopyramids for water splitting and dye degradation

  • I. Neelakanta Reddy
  • Adem Sreedhar
  • Ch. Venkata Reddy
  • Jaesool Shim
  • Migyung Cho
  • Dongseob Kim
  • Jin Seog Gwag
  • Kisoo Yoo
Original Paper

Abstract

Iron oxide (Fe3O4) pyramid nanostructures were synthesized via a co-precipitation method, without using surfactants or template, for photocatalytic and photoelectrocatalytic activities. The as-made Fe3O4 was characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), UV–vis spectroscopy, photoluminescence spectroscopy, N2 adsorption–desorption analysis, and X-ray photoelectron spectroscopy (XPS). The data clearly demonstrate that the Fe3O4 nanostructures display excellent crystallinity, uniform morphology with a Brunauer–Emmett–Teller (BET) surface area of 52.95 m2 g−1, and an optical bandgap of 2.17 eV, which allows them to serve as outstanding catalysts under visible irradiation. The highest photocatalytic activity of ~ 97% was achieved in the degradation of rhodamine B under visible irradiation, with a degradation rate constant of 0.0322 min−1 at room temperature. Further, electrochemical studies demonstrated that the Fe3O4 electrode possesses good electrocatalytic activity in 0.1 M KOH electrolyte. The highest photocurrent density of 1.2 × 10−4 mA cm−2 was observed in the water splitting reaction. The Fe3O4 nanostructures exhibited superior performance in terms of both dye degradation and photoelectrochemical activity.

Keywords

Fe3O4 Nanostructures Degradation Photoelectrochemical Pyramid-like structures 

Notes

Funding information

This work was supported by the National Research Foundation of Korea grant funded by the Korea government (No. 2015R1A2A2A01003741, 2015R1C1A2A01052256, 2018R1D1A1B07048307, and 2017R1A4A1015581).

Supplementary material

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ESM 1

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High Resolution Image (TIFF 616 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Mechanical EngineeringYeungnam UniversityGyeongsanSouth Korea
  2. 2.Department of PhysicsYeungnam UniversityGyeongsanSouth Korea
  3. 3.School of Information EngineeringTongmyong UniversityBusanSouth Korea
  4. 4.Aircraft System Technology GroupKorea Institute of Industrial TechnologyYeongcheon-siSouth Korea

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