Browsing by Author "Ghobadi, T. Gamze Ulusoy"
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Item Open Access Corrigendum: Building an iron chromophore incorporating prussian blue analogue for photoelectrochemical water oxidation(Wiley-VCH Verlag GmbH & Co. KGaA, 2021-09-20) Ghobadi, T. Gamze Ulusoy; Ghobadi, Amir; Demirtaş, Merve; Büyüktemiz, M.; Kübra N., Özvural; Yıldız, E. A.; Erdem, E.; Yağlıgül, H. G.; Durgun, Engin; Dede, Y.; Özbay, Ekmel; Karadaş, FerdiThe replacement of traditional ruthenium-based photosensitizers with low-cost and abundant iron analogs is a key step for the advancement of scalable and sustainable dye-sensitized water splitting cells. In this proof-of-concept study, a pyridinium ligand coordinated pentacyanoferrate(II) chromophore is used to construct a cyanide-based CoFe extended bulk framework, in which the iron photosensitizer units are connected to cobalt water oxidation catalytic sites through cyanide linkers. The iron-sensitized photoanode exhibits exceptional stability for at least 5 h at pH 7 and features its photosensitizing ability with an incident photon-to-current conversion capacity up to 500 nm with nanosecond scale excited state lifetime. Ultrafast transient absorption and computational studies reveal that iron and cobalt sites mutually support each other for charge separation via short bridging cyanide groups and for injection to the semiconductor in our proof-of-concept photoelectrochemical device. The reorganization of the excited states due to the mixing of electronic states of metal-based orbitals subsequently tailor the electron transfer cascade during the photoelectrochemical process. This breakthrough in chromophore-catalyst assemblies will spark interest in dye-sensitization with robust bulk systems for photoconversion applications.Item Open Access Electrodeposited cobalt hexacyanoferrate electrode as a non-enzymatic glucose sensor under neutral conditions(Elsevier B.V., 2021-10-19) Oglou, Ramadan Chalil; Ghobadi, T. Gamze Ulusoy; Özbay, Ekmel; Karadaş, FerdiA CoFe Prussian blue analogue (CoFe PB) modified FTO electrode, prepared via a facile electrodepositionmethod, is investigated as a non-enzymatic glucose sensor under neutral conditions. The electrode ex-hibits a linear detection of glucose in the 0.1e8.2 mmol/L range with a detection limit of 67mM, asensitivity of 18.69mA/mM.cm2, and a fast response time of less than 7 s under neutral conditions. Its stability is confirmed with both electrochemical experiments and characterization studies performed on the pristine and post-mortem electrode. We also conducted a comprehensive electrochemical analysis to elucidate the identity of the active site and the glucose oxidation mechanism on the Prussian blue surface.