Sulfur enriched cobalt-based layered double hydroxides for oxygen evolution reactions

Sajid Ullah, Umair Shamraiz, Elizbit, Amin Badshah, Bareera Raza, Ahmad Salam Farooqi, Hafiz Muhammad Tofil, Muhammad Adnan Zeb, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Sulfur and zinc substituted Co(OH)2 is synthesized by a simple co-precipitation one-step method followed by solvothermal treatment for oxygen evolution reaction. The high-resolution X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) demonstrates that the Zn and S substitution significantly stabilizes the layered structure and causes an increase in the electron density around the Co center. The role of both cation and anion substitution is evaluated to enhance the oxygen evolution reactions. This enhanced activity is due to the in-situ oxidation of divalent Co into trivalent Co, and partially due to the stabilization of the layered structure, as highlighted by PXRD and TEM analysis, the gap between the layers is slightly reduced from 7.8 Å to 7.5 Å, for S–Zn–Co(OH)2. The in-situ conversion of Co2+ to Co3+ during electrocatalysis improved the OER electrocatalysis. The structural and physical characterizations are performed via XRD, EDX, SEM, TEM, XPS, AFM and BET.

Original languageBritish English
Pages (from-to)30799-30809
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number72
DOIs
StatePublished - 22 Aug 2022

Keywords

  • Cation and anion substitution
  • Cobalt hydroxide
  • High current density
  • Oxygen evolution reaction
  • Water oxidation

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