Hierarchically Coupled Ni:FeOOH Nanosheets on 3D N-Doped Graphite Foam as Self-Supported Electrocatalysts for Efficient and Durable Water Oxidation

  • Mahesh P. Suryawanshi
    Mahesh P. Suryawanshi
    Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
  • Uma V. Ghorpade
    Uma V. Ghorpade
    Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
  • Seung Wook Shin
    Seung Wook Shin
    Future Agricultural Research Division, Water Resource and Environment Research Group, Rural Research Institute, Korea Rural Community Corporation, Ansan-Si, Gyeonggi-do 15634, South Korea
  • Umesh P. Suryawanshi
    Umesh P. Suryawanshi
    Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
  • Eunae Jo
    Eunae Jo
    Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
    More by Eunae Jo
  • , and 
  • Jin Hyeok Kim*
    Jin Hyeok Kim
    Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 61186, South Korea
    *Tel.: +82-62-530-1709. Fax: 82-62-530-1699. E-mail: [email protected]
Cite this: ACS Catal. 2019, 9, 6, 5025–5034
Publication Date (Web):April 26, 2019
Copyright © 2019 American Chemical Society
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Here, a hierarchical nanostructure composed of Ni-doped α-FeOOH (Ni:FeOOH) nanosheets coupled with N-doped graphite foam (NGF) is demonstrated as a three-dimensional (3D) self-supported electrocatalyst for highly efficient and durable water oxidation. A facile, one-step directional growth of catalytically active Ni:FeOOH nanosheets on highly conducting 3D NGF results in a fully integrated, hierarchical, nanostructured electrocatalyst with (i) the high intrinsic activity of Ni:FeOOH, (ii) the outstanding electrical conductivity of NGF, and (iii) a well-defined porous structure with an enhanced active surface area. As a result, the self-supported 3D Ni:FeOOH/NGF electrocatalyst exhibits remarkable electrocatalytic activity for the oxygen evolution reaction (OER) in an alkaline solution with an overpotential of 214 mV at 10 mA/cm2, a high stability for over 60 h, a low Tafel slope of 36.2 mV dec–1, and a capability of delivering a high current density of 300 mA/cm2 at an overpotential of 368 mV. In contrast to photodeposition, electrodeposition, and hydrothermal methods for the formation/integration of (oxy)hydroxides, this facile solution strategy for designing an attractive and efficient structure with a highly active metal (oxy)hydroxide and highly conducting NGF provides a pathway to develop other earth-abundant electrocatalysts for a multitude of energy-conversion-device applications.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acscatal.9b00492.

  • Detailed experimental procedures for the NGF, OER electrocatalysts and electrocatalyst/NGF heterostructure fabrication, characterization methods, and electrochemical measurements; additional FE-SEM images of GFL and NGF; XRD patterns, EDS spectrum of Ni:FeOOH/NGF; different characterizations of FeOOH and NiOOH deposited on NGF; XPS spectra of GFL and NGF; electrochemical performances of FeOOH, NiOOH, and Ni:FeOOH and Ni:FeOOH with different Ni/Fe ratios and on different supports; different characterizations of Ni:FeOOH/NGF after the stability test; BET results of GFL and NGF (PDF)

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