NiS@CuBi2O4/ERGO heterostructured electro-catalyst for enhanced hydrogen evolution reaction

ÖZTÜRK DOĞAN H., Kurt Urhan B.

Micro and Nanostructures, cilt.183, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 183
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.micrna.2023.207666
  • Dergi Adı: Micro and Nanostructures
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Copper bismuthate, Electrochemical deposition, Electroreduced graphene oxide, HER, Nickel sulfide
  • Atatürk Üniversitesi Adresli: Evet

Özet

In this study, nickel sulfide (NiS)-decorated copper bismuthate/electro-reduced graphene oxide nanocomposites (NiS@CuBi2O4/ERGO) were fabricated on nickel foam (NF) electrodes by a two-step synthesis method including electrochemical deposition technique and thermally annealing. The prepared electrode materials were characterized using XRD, XPS, EDS, and SEM techniques. The NiS@CuBi2O4/ERGO electrode was used as a promising electrocatalyst for hydrogen evolution reaction (HER). The resulting electrode exhibited superb electrocatalytic activity, probably originating from more active sites and a higher electron transfer rate than the NF. HER activity of the electrode was investigated in 0.5 M H2SO4 solution and had an overpotential of 210 mV at the current density of 10 mA cm−2. Thanks to the NiS decoration, the HER stability of the thin films in the acidic environment has shown a remarkable improvement. Moreover, the electrocatalyst material, produced using a simple method, retained its activity by about ∼71% after stability tests at 100 mA cm−2.