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Electrochemically Exfoliated β-Co(OH)2 Nanostructures for Enhanced Oxygen Evolution Electrocatalysis

  • Naduvile Purayil Dileep
    Naduvile Purayil Dileep
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
  • Thazhe Veettil Vineesh
    Thazhe Veettil Vineesh
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
  • Prasad V. Sarma
    Prasad V. Sarma
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
  • Muhsin V. Chalil
    Muhsin V. Chalil
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
  • Ciril Samuel Prasad
    Ciril Samuel Prasad
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
  • , and 
  • M. M. Shaijumon*
    M. M. Shaijumon
    School of Physics, IISER Thiruvananthapuram, Maruthamala PO, Vithura, Kerala 695551, India
    *E-mail: [email protected]
Cite this: ACS Appl. Energy Mater. 2020, 3, 2, 1461–1467
Publication Date (Web):January 24, 2020
Copyright © 2020 American Chemical Society

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    Exploring highly efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is very important for the development of renewable energy conversion and storage systems. Layered metal hydroxides have been studied with great interest owing to their high electrochemical activity and stability toward OER. Herein, we demonstrate an efficient approach to engineer the surface active sites in β-Co(OH)2 for enhanced electrocatalysis of OER. We employ a single-step bipolar electrochemical technique for the exfoliation of pristine β-Co(OH)2(Co(OH)2-Bulk) into thinner and smaller sheets. The as-synthesized Co(OH)2 nanostructures with improved active sites exhibit enhanced electrocatalytic activity toward OER with a very low overpotential of 390 mV at 10 mA cm–2 and a Tafel slope of 57 mV dec–1 in alkaline media. The results provide a promising lead for the development of efficient and economically viable electrode materials for oxygen evolution electrocatalysis.

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