Publication:
Compositional alteration of low dimensional nickel sulfides under hydrogen evolution reaction conditions in alkaline media

dc.contributor.departmentGraduate School of Sciences and Engineering
dc.contributor.departmentDepartment of Computer Engineering
dc.contributor.departmentDepartment of Chemistry
dc.contributor.departmentKUTEM (Koç University Tüpraş Energy Center)
dc.contributor.kuauthorKarakaya, Cüneyt
dc.contributor.kuauthorKaya, Sarp
dc.contributor.kuauthorŞimşek, Kaan
dc.contributor.kuauthorSolati, Navid
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.contributor.schoolcollegeinstituteResearch Center
dc.contributor.schoolcollegeinstituteGRADUATE SCHOOL OF SCIENCES AND ENGINEERING
dc.date.accessioned2024-12-29T09:38:51Z
dc.date.issued2024
dc.description.abstractDeveloping cost-effective electrodes for electrochemical water splitting with minimal kinetic losses remains a primary challenge in water electrolysis. Nickel-based dichalcogenides, particularly sulfides, have emerged as promising candidates for the hydrogen evolution reaction (HER). However, the stability of various nickel sulfide (NixSy) phases under cathodic potentials in alkaline electrolytes is subject to debate. In this study, we investigate the HER activity and durability of both 2-dimensional (2D) and 3-dimensional (3D) NixSy nanostructures with diverse chemical compositions. Through cross-correlation analysis of spectroscopic and electrochemical characterization data, we elucidate the transformation behavior of these materials under operating conditions. Our findings reveal that NiS2 tends to undergo conversion to nickel hydroxide (Ni(OH)2), while Ni-rich phases like Ni3S4 and NiS exhibit greater stability. Furthermore, we demonstrate that in 3D nanostructures, the initial formation of a protective hydroxide layer on the surface inhibits further sulfide transformation. This nickel sulfide/hydroxide composite shows an improved HER activity with lower onset potential (−0.25 V), Tafel slope (105 mV s−1), and charge transfer resistance (17.3 Ω).
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.sponsorshipThe authors would also like to thank Ko\u00E7 University Surface Science and Technology Center (KUYTAM) for providing XRD and XPS analysis. C.K. N.S. and S.K. would like to thank the technicians of T\u00FCpra\u015F R&D Center Laboratories for collaborative research support.
dc.description.volume38
dc.identifier.doi10.1016/j.mtchem.2024.102081
dc.identifier.eissnN/A
dc.identifier.issn2468-5194
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-85193238688
dc.identifier.urihttps://doi.org/10.1016/j.mtchem.2024.102081
dc.identifier.urihttps://hdl.handle.net/20.500.14288/22823
dc.identifier.wos1298682800001
dc.keywordsHydrogen evolution reaction
dc.keywordsNickel hydroxide
dc.keywordsNickel sulfide
dc.keywordsRaman spectroscopy
dc.keywordsStability
dc.language.isoeng
dc.publisherElsevier Ltd
dc.relation.ispartofMaterials Today Chemistry
dc.subjectChemistry
dc.subjectMaterials science
dc.titleCompositional alteration of low dimensional nickel sulfides under hydrogen evolution reaction conditions in alkaline media
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorSolati, Navid
local.contributor.kuauthorKarakaya, Cüneyt
local.contributor.kuauthorŞimşek, Kaan
local.contributor.kuauthorKaya, Sarp
local.publication.orgunit1GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
local.publication.orgunit2Department of Computer Engineering;Department of Chemistry
local.publication.orgunit2Graduate School of Sciences and Engineering
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