Ni(ii) dithiolate anion composites with two-dimensional materials for electrochemical oxygen evolution reactions (OERs)

Ayushi Singh, Amita Singh, Gabriele Kociok-Köhn, Kieran C. Molloy, Ashish Kumar Singh, Abhinav Kumar, Mohd Muddassir

Research output: Contribution to journalArticlepeer-review

Abstract

In this report, the composites of anionic complex [NEt4][Ni(S2C2Ph2)2] with two-dimensional materials such as graphene oxide (GO), reduced graphene oxide (rGO) or graphitic carbon nitride (g-C3N4) have been prepared by a simple sonochemical technique and utilized for the oxygen evolution half-cell reaction of water splitting. The synthesized complex anion has been characterized spectroscopically and by single-crystal X-ray diffraction, while its composites with GO, rGO and g-C3N4have been characterized using physicochemical characterization techniques,viz.powder X-ray diffraction and scanning electron microscopy. Electrochemical measurements were performed on a three-electrode system having a platinum wire counter electrode, a Ag/AgCl reference electrode and a catalytically modified glassy carbon electrode using linear sweep voltammetry, cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical studies suggest that the [Ni(S2C2Ph2)2]-rGO modified electrode had notable electrocatalytic activity for the oxygen evolution reaction (OER). The fabricated electrode exhibited acceptable repeatability, reproducibility and stability. To the best of our knowledge, there are only a few reports on detailed studies of composites of 2D materials with a nickel-based molecular complex, exhibiting substantial synergistic activity towards electrochemical water splitting.

Original languageEnglish
Pages (from-to)16264-16270
Number of pages7
JournalNew Journal of Chemistry
Volume45
Issue number35
Early online date28 Jul 2021
DOIs
Publication statusPublished - 21 Sep 2021

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Cite this