Sulfide interlayered cobalt-based oxynitrides for efficient oxygen evolution reaction in neutral pH water and seawater

Ahmed Badreldin, Jehad Abed, Noor Hassan, Abdellatif El-Ghenymy, Wafa Suwaileh, Yiming Wubulikasimu, Zafar Khan Ghouri, Karim Youssef, Dharmesh Kumar, Khaled Elsaid, Edward H. Sargent, Ahmed Abdel-Wahab*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Sluggish kinetics of the anodic oxygen evolution reaction (OER) and minor upstream upsets in feed water quality remain bottlenecks for efficient water electrolysis, which is exacerbated under near-neutral pH environments due to H2O dissociation. In this work, we report the introduction of a NiSx interlayer in a Co-(NiFe) oxide/nitride catalyst on nickel foam substrate. Postmortem OER characterization in neutral pH synthetic seawater (SSW) shows that stable cationic [Co-(NiFe)]δ+ and anionic [O-N]δ– surface species coupled with the NiSx interlayer accelerate H2O dissociation, thereby enhancing activity and kinetics. The electrocatalysts exhibit stable performance at 100 mA cm−2 for 50 h in alkaline and neutral pH SSW with 350 and 425 mV of overpotential, respectively. The faradaic efficiency of the NiSx interlayer catalysts is enhanced by 10.3% and 8.5% achieving 94.5% and 87.4% under alkaline and neutral pH SSW, respectively, during chronoamperometry tests at a high applied voltage of 1.75 V (vs. RHE).

Original languageEnglish
Article number122599
JournalApplied Catalysis B: Environmental
Volume330
DOIs
Publication statusPublished - 5 Aug 2023
Externally publishedYes

Keywords

  • Electrochemical water oxidation
  • Impure water electrolysis
  • Neutral pH water electrolysis
  • Oxygen evolution reaction
  • Seawater electrolysis

Fingerprint

Dive into the research topics of 'Sulfide interlayered cobalt-based oxynitrides for efficient oxygen evolution reaction in neutral pH water and seawater'. Together they form a unique fingerprint.

Cite this