Reduced graphene oxide supported meso-pyridyl BODIPY-Cobaloxime complexes for electrocatalytic hydrogen evolution reaction

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dc.contributor.authorGumrukcu, Selin
dc.contributor.authorKaplan, Ekrem
dc.contributor.authorKarazehir, Tolga
dc.contributor.authorOzcesmeci, Mukaddes
dc.contributor.authorOzcesmeci, Ibrahim
dc.contributor.authorHamuryudan, Esin
dc.date.accessioned2025-01-06T17:43:16Z
dc.date.available2025-01-06T17:43:16Z
dc.date.issued2024
dc.description.abstractCreating innovative catalysts utilizing nonprecious metals for the electrocatalytic hydrogen evolution reaction (HER) poses a significant difficulty. We present a cobaloxime (Cox) complex having pyridine (2-Cox) and tetrafluorophenyl-thio-pyridine (4-Cox) functional groups, which contains a 4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) moiety. This combination serves as a catalyst for proton reduction and is immobilized onto reduced graphene oxide (rGO) by pi-pi stacking between the cobaloxime complex and rGO. Moreover, the unique complex's structures were determined through the application of ultraviolet-visible spectroscopy (UV-Vis), Fourier Transform Infrared spectroscopy (FT-IR), X-ray diffraction spectroscopy (XRD), and scanning electron microscopy (SEM). The electrocatalytic activity of the two rGO/2-Cox and rGO/4-Cox electrodes towards hydrogen (H-2) were examined under both alkaline and acidic conditions. The cobaloxime-modified rGO electrodes demonstrate superior electrocatalytic performance for the HER under acidic conditions compared to alkaline conditions. The overpotential at a current density of 10 mA cm(-2) for rGO/2-Cox in 0.5 M H2SO4 is -0.342 V, which is notably lower than the overpotential of rGO/4-Cox (-0.496 V). The Tafel slope for the rGO/2-Cox electrode in a 0.5 M H2SO4 solution is 111 mV.dec(-1), but for the rGO/4-Cox electrode it is 156 mVdec(-1). This discrepancy suggests that the rGO/2-Cox electrode demonstrates better performance in the HER compared to the rGO/4-Cox electrode.
dc.description.sponsorshipResearch Fund of the Istanbul Technical University [43721]
dc.description.sponsorshipThis work was supported by the Research Fund of the Istanbul Technical University (Project Number: 43721) . The authors thank Prof. Dr. Emin Ciftci for their contribution about XRD measurements.
dc.identifier.doi10.1016/j.ijhydene.2024.09.284
dc.identifier.endpage473
dc.identifier.issn0360-3199
dc.identifier.issn1879-3487
dc.identifier.scopus2-s2.0-85204936691
dc.identifier.scopusqualityQ1
dc.identifier.startpage462
dc.identifier.urihttps://doi.org/10.1016/j.ijhydene.2024.09.284
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2585
dc.identifier.volume89
dc.identifier.wosWOS:001329098400001
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
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_20241211
dc.subjectHydrogen evolution reaction (HER)
dc.subjectBODIPY
dc.subjectCobaloxime
dc.subjectAcidic water electrolysis
dc.subjectAlkaline water electrolysis
dc.titleReduced graphene oxide supported meso-pyridyl BODIPY-Cobaloxime complexes for electrocatalytic hydrogen evolution reaction
dc.typeArticle

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