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RISS 인기검색어
- 검색키워드
- 저자 : Grzegorz D. Sulka (검색결과 3 건)
- 무료
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Tuning the visible light activity of tungsten oxide layers by changing the anodization conditions
Karolina Syrek,Marta Zych,Grzegorz D. Sulka 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Photoelectrochemical water splitting under solar radiation is one of the most studied methods of solarto-fuel energy conversion. The search for effective photoelectrode materials operating under solar radiationis still ongoing, and in this paper, it is shown how to control the optical and photoelectrochemicalproperties of anodic tungsten oxide layers by changing the anodizing potential. Anodic tungsten oxidelayers were obtained in an aqueous electrolyte with 1 M ammonium sulfate and 75 mM ammonium fluorideat a constant voltage of 20–70 V and annealed at 500 C in air. Comprehensive characterization ofmaterials was performed using SEM, XRD, UV–Vis DRS, Mott-Schottky analyses, and photoelectrochemicalwater splitting tests. It was found that with increasing the anodizing potential the band gap narrowsfrom 3.09 eV to 2.75 eV, donor density increases, and the IPCE spectrum shifts towards the visible lightrange.
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Magdalena Gurgul,Karolina Gawlak,Karolina Syrek,Marcin Kozieł,Grzegorz D. Sulka,Leszek Zaraska 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Nanoporous SnOx films with ultra-small channels (<20 nm in diameter) were synthesized by one-stepanodic oxidation of Sn foil in 1 M sodium hydroxide. Then, as-prepared materials were immersed indistilled water for various durations (2–120 h) tofind out whether a simple soaking process can affect thephotoelectrochemical performance of such kind of photoanodes. It was confirmed that during exposureto water, spontaneous crystallization of the amorphous SnOx matrix into rutile-type SnO2 occurs via adissolution–redeposition process, which results in a gradual loss of the initial porous morphology andthinning of the anodicfilm. Moreover, due to the formation of less defective, more stoichiometric, andcrystalline SnO2-x, gradual widening of the semiconductor band gap, the cathodic shift of theflat bandand onset potentials, as well as decrease in the donor density are observed. All these factors are thereason for the significant deterioration of the photoelectrochemical performance of SnOx photoanodesduring their exposure to water. Therefore, it was confirmed that even slight differences in theexperimental procedure, especially sample washing, drying, and storage, can result in meaningfulchanges in the composition, and the photoelectrochemical properties of anodically generated tin oxidefilms.
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Influence of synthesis parameters on composition and morphology of electrodeposited Zn-Sb thin films
Dominika Rajska,Kacper Motyka,Marcin Kozieł,Damian Chlebda,Agnieszka Brzózka,Grzegorz D. Sulka 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
The influence of bath concentration, electrodeposition potential, and hydrodynamic conditions in theelectrolytic cell on the morphology, chemical composition, and crystal structure of synthesized Zn, Sb,and Zn-Sb thinfilms was demonstrated based on FE-SEM, EDS, XRD, and Raman measurements. It wasfound that an increase in the working electrode potential leads to the formation of thinfilms with ahigher atomic percentage (at.%) of zinc. Contrary, increasing SbCl3 concentration in the citrate bath andapplication of electrolyte stirring, lead to the preferential electrodeposition of thinfilms containing ahigher content of antimony. From the point of view of thermoelectric applications, the most promisingmaterial was that containing the ZnSb crystal phase with the Zn/Sb atomic ratio of 1. The best results forelectrodeposition of Zn-Sb thinfilms were observed at1.5 V vs. Ag/AgCl (3 M KCl) in the citrate bathcontaining 0.045 M ZnCl2 and 0.045 M SbCl3 in the absence of electrolyte stirring. As a result, anamorphous ZnSb thinfilm with the Zn/Sb atomic ratio of 1.03 was obtained. The sample with acomposition very close to stoichiometric ZnSb was annealed in an inert atmosphere in order to transformit into a crystalline thinfilm.
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