Bi2S3 and NiBiS3 electrocatalysts for alkaline hydrogen evolution reactions

Basit Öğe Kaydı
dc.authoridDoğru Mert, Başak/0000-0002-2270-9032
dc.authoridAksaray, Goncagül/0000-0003-4338-6049
dc.authoridtezcan, fatih/0000-0001-7656-3529
dc.authoridMERT, MEHMET ERMAN/0000-0002-0114-8707
dc.contributor.authorAksaray, Goncagul
dc.contributor.authorMert, Mehmet Erman
dc.contributor.authorMert, Basak Dogru
dc.contributor.authorKardas, Gulfeza
dc.date.accessioned2026-02-27T07:33:10Z
dc.date.available2026-02-27T07:33:10Z
dc.date.issued2025
dc.description.abstractDeveloping efficient and available catalysts is important for advancing hydrogen evolution reaction (HER) in alkaline water electrolysis, a promising technology for sustainable hydrogen production. This study reports the synthesis and electrochemical performance of Bi2S3 and NiBiS3 catalysts for the HER in alkaline water electrolysis. The catalysts were prepared via a hydrothermal method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The electrochemical behavior was evaluated using cyclic voltammetry (CV), cathodic current-potential curves (Tafel polarization), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA) in 1 M KOH. The graphite electrode modified with NiBiS3 exhibited high catalytic activity. The significant increase in current density and decrease in polarization resistance from 3000 S2 cm2 (bare graphite) to 18.55 S2 cm2 were detected. The G/NiBiS3 electrode outperformed both the bare graphite and G/Bi2S3 electrodes, with the current density reaching-2.3 x 10-3 A cm-2 at-0.26 V. Morphological analysis revealed that Bi2S3 forms flower-like structures, while NiBiS3 exhibits a cauliflower-like morphology, providing increased active surface areas important for catalytic activity. The Tafel slope analysis confirmed the Volmer step as the rate-determining step in the HER mechanism, with the adsorbed hydrogen subsequently forming molecular hydrogen. Stability testing through CA demonstrated consistent catalytic activity, with the current density maintained at-0.014 A cm-2 over 75000 s. These findings demonstrate the potential of NiBiS3 as a reliable and effective catalyst for alkaline electrolysis-based sustainable hydrogen production.
dc.identifier.doi10.1016/j.ijhydene.2025.01.500
dc.identifier.endpage1338
dc.identifier.issn0360-3199
dc.identifier.issn1879-3487
dc.identifier.startpage1330
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijhydene.2025.01.500
dc.identifier.urihttps://hdl.handle.net/20.500.14669/4455
dc.identifier.volume143
dc.identifier.wosWOS:001512904900014
dc.indekslendigikaynakWeb of Science
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofInternational Journal of Hydrogen Energy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20260302
dc.subjectHydrothermal synthesis
dc.subjectElectrocatalysts
dc.subjectHER
dc.subjectNiBiS3
dc.subjectAlkaline electrolysis
dc.titleBi2S3 and NiBiS3 electrocatalysts for alkaline hydrogen evolution reactions
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu