http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Karolina Syrek (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
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.
-
Photoelectrochemical activity of Cu2O electrochemically deposited at different temperatures
Karolina Syrek,Magdalena Jazdzewska,Marcin Kozieł,Leszek Zaraska 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Cuprous oxide (Cu2O) is considered one of the most promising candidates for photocathodes in photoelectrochemicalsystems due to its favorable properties including p-type conductivity and narrow bandgap. Therefore, Cu2O thin films were electrochemically deposited on FTO-coated glass from the bath containing0.2 M CuSO4 and 3 M lactic acid (pH=12) at the potential of 0.5 V vs SCE for 1 h at three differenttemperatures (20 C, 40 C, and 60 C). The obtained materials were characterized using various techniquesincluding SEM/EDS, XRD, UV–vis DRS, and EIS measurements. It was found that rising the electrodepositiontemperature causes not only an increase in the oxide growth rate but also influences thecrystallite orientation preference (the higher preferred orientation of the h111i plane was observed athigher temperatures). Photoelectrochemical measurements confirmed the superior performance of theFTO/Cu2O cathode synthesized at the highest studied temperature (60 C), most likely due to the greaterthickness of the deposit as well as higher material texture. On the contrary, the optical and electrochemicalband gaps were found to be independent of the temperature applied during deposition. Finally, thepossibility of using such kind of electrochemically synthesized FTO/Cu2O photocathodes for solar lightinducedammonia synthesis was also demonstrated.
-
Karolina Syrek,Olena Tynkevych,Mateusz Wojtas,Marcin Kozieł,Łukasz Pieta,Leszek Zaraska 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
The possibility of fabrication of nanostructured ZnO layers on conductive glass substrates via simpleroom-temperature electrodeposition was studied in detail. The process was carried out in zinc nitrateelectrolyte at different potentials for various durations. The morphology, composition, and semiconductingproperties of the deposits were examined by various techniques. As-synthesized materials werefound to be amorphous and co-deposition of the metallic Zn at more negative potentials was confirmed. Nevertheless, thermal treatment in air results in the successful conversion of the as-deposited precipitateto the wurtzite ZnO. The potential of 1.5 V vs. SCE was identified as optimal to achieve both full coverageof the glass substrate, as well as uniform morphology of the deposits. In general, the photoelectrochemicalperformance of such kind of ZnO photoanodes was found to be significantly dependent onthe electrodeposition duration since this parameter strongly affected the thickness, surface morphology,as well as semiconducting properties of the obtained material. In consequence, the photoanode depositedat 1.5 V vs. SCE for 40 min exhibited the most promising photoelectrochemical activity under studiedconditions.
-
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.
-
Aleksandra Knapik,Karolina Syrek,Marcin Kozieł,Leszek Zaraska 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Tin dioxide (SnO2) films deposited on transparent conductive substrates have been considered as promisingcandidates for photoelectrochemical and photovoltaic applications due to their promising propertiessuch as high electron mobility, stability, and favorable band edges positions. Therefore, a simple electrochemicalapproach based on the cathodic deposition of SnO2 on a conductive glass substrate was proposed. SnO2 layers were obtained by electrodeposition from SnCl2 solution containing HNO3 at variouspotentials (from 0.6 V to 1.0 V vs. SCE) for various durations (from 5 min to 180 min). The obtainedmaterials were then annealed in air at 400 C and characterized. The co-deposition of the metallic phaseat the most negative potential was confirmed. However, it was successfully converted to the oxide phaseby thermal treatment. The photoelectrochemical activity of the materials during illumination withmonochromatic light from the range between 250 and 500 nm was studied. The higher photocurrentswere generated by annealed layers, and the most promising photoelectrochemical properties wereobserved for the sample deposited at 0.8 V vs. SCE for 180 min. It is expected that such a simple electrochemicalapproach can be an effective strategy for the fabrication of highly efficient photoanodes forphotoelectrochemical and photovoltaic applications.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
