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β-like FeOOH Nanoswords Activated by Ni Foam and Encapsulated by rGO toward High Current Densities, Durability, and Efficient Oxygen Evolution

  • Nishad G. Deshpande
    Nishad G. Deshpande
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
  • Dong Su Kim
    Dong Su Kim
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
    More by Dong Su Kim
  • Cheol Hyoun Ahn
    Cheol Hyoun Ahn
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
  • Sung Hyeon Jung
    Sung Hyeon Jung
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
  • Young Been Kim
    Young Been Kim
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
  • Ho Seong Lee
    Ho Seong Lee
    School of Materials Science and Engineering, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu 41566, Republic of Korea
    More by Ho Seong Lee
  • , and 
  • Hyung Koun Cho*
    Hyung Koun Cho
    School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
    Research Center for Advanced Materials Technology, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
    *Email: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2021, 13, 16, 18772–18783
Publication Date (Web):April 15, 2021
https://doi.org/10.1021/acsami.1c01428
Copyright © 2021 American Chemical Society
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Abstract

As an alternative to the oxygen evolution reaction (OER) electrocatalyst developed by a complex bi- or multimetal ion with layered double hydroxide (LDH) structures, we design a simple, self-supported, and single-metal-ion OER electrocatalyst having lower overpotentials and high current densities in alkaline water electrolyzers. Here, β-like FeOOH nanosword structures encapsulated by reduced graphene oxide (rGO) were cost-effectively synthesized on formable Ni foam substrates as an efficient and highly durable OER catalyst. It is revealed that the rGO uniformly covered the β-like FeOOH nanoswords to form a porous network achieving a lower overpotential of only 210 mV at 10 mA cm–2 with a stable operation for more than 40 h in alkali media. Moreover, a high current density of ∼300 mA cm–2 was achieved at less than 1.8 V. In-depth physical and electrochemical analysis indicated that the intrinsic charge transfer through activated Ni-foam, β-like phase, and nanosword morphology was evidently beneficial for enhancing the OER activity of the bare FeOOH, and its encapsulation by rGO further improved the conductivity and long-life durability. Our integrated OER electrocatalyst developed by a simple method (repeated soaking and quenching process) will aid in scaling up β-like FeOOH nanoswords for preparing uniform and large-area electrodes for industrial purposes.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.1c01428.

  • FESEM images (Figure S1); elemental mapping studies (Figure S2); XPS analysis (Figure S3); FESEM images for samples on FTO substrate with the corresponding EDAX and LSV data (Figure S4); possible charge transfer mechanism (Scheme S1); CV curves of bare Ni foam and β-like FeOOH samples (Figure S5); quenching temperature effect on β-like FeOOH nanosword formation and the corresponding LSV data (Figure S6); soaking effect on β-like FeOOH nanosword formation and the corresponding LSV data (Figure S7); Raman data of rGO on Ni foam and stability curve (Figure S8); comparative LSV before and after stability studies (Figure S9); FESEM images after stability studies (Figure S10); comparative chart of similar electrocatalyst materials and their OER performance (Table S1); and comparison of current density measured at 1.23 VRHE (Table S2) (PDF)

  • O2 and H2 evolution (Video V1) (MP4)

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