Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid
Само за регистроване кориснике
2021
Аутори
Mravik, ŽeljkoBajuk-Bogdanović, Danica V.
Mraković, Ana Đ.
Vukosavljević, Ljubiša
Trajić, Ivan
Kovač, Janez
Peruško, Davor
Gavrilov, Nemanja
Jovanović, Zoran M.
Чланак у часопису (Објављена верзија)
,
© 2021 Elsevier Ltd.
Метаподаци
Приказ свих података о документуАпстракт
In recent years polyoxometalates (POMs) have attracted significant research interest due to versatile properties. These properties are determined by the size, structure and elemental composition of POMs and hence play an important role in their application. In the present study, the ion beam irradiation (10 keV C+ ions, 5 × 1014–2.5 × 1015 ions/cm2) has been utilized for modification of physicochemical properties of 120 nm-thick layer of 12-tungstophosphoric acid (WPA). Scanning electron microscopy analysis of irradiated films showed change of morphology i.e. an increase of WPA grain size with irradiation and coalescence of grains at the highest fluence. This was accompanied by structural changes. Attenuated total reflectance Fourier transform infrared analysis revealed that vibration bands of Keggin anion became less pronounced as fluence increased, while Raman spectra appeared as strongly modified. The effect of irradiation with 1.25 × 1015 ions/cm2 on the structure of WPA was simila...r to the effect of thermal treatment at 600 °C. Irradiation of WPA led to decrease of the band gap (from 4.07 to 3.92 eV), which was correlated to transformation Keggin anions into a network of WO6 octahedra and PO4 tetrahedra. This is in line with increased number of W=Od bonds observed by UV–Visible diffuse reflectance spectroscopy. Beside transformation to bronzes a reduction of WPA was observed by X-ray Photoelectron Spectroscopy (shift to lower binding energy) and Raman methods, whereas the Raman spectra of irradiated samples were similar to heteropoly blue. The electrochemical properties of irradiated WPA were also assessed. Cyclic voltammetry measurements showed that at up to 1.25 × 1015 ions/cm2 lithiation capacity of WPA increases and activity for hydrogen evolution reaction (HER) improves. The highest fluence caused interconnection of WO6 octahedra, closing of lithiation pathways and decrease in the number of active sites for HER. Our results provide a novel insight into the effects of ion beam irradiation on WPA and demonstrate high potential for tuning of physicochemical properties of POMs that are relevant in wide range of applications. © 2021 Elsevier Ltd
Кључне речи:
Ion beam irradiation / Polyoxometalates / Keggin anion / Structural modification / Energy storage materialsИзвор:
Radiation Physics and Chemistry, 2021, 183, 109422-Финансирање / пројекти:
- Физика и хемија са јонским сноповима (RS-45006)
- Литијум-јон батерије и горивне ћелије-истраживање и развој (RS-45014)
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-45015)
- Физички процеси у синтези нових наноструктурних материјала (RS-171023)
- Slovenian Research Agency [P2-0091]
- Slovenian Research Agency [P2-0082]
DOI: 10.1016/j.radphyschem.2021.109422
ISSN: 0969-806X
WoS: 000647558900012
Scopus: 2-s2.0-85102423997
Колекције
Институција/група
VinčaTY - JOUR AU - Mravik, Željko AU - Bajuk-Bogdanović, Danica V. AU - Mraković, Ana Đ. AU - Vukosavljević, Ljubiša AU - Trajić, Ivan AU - Kovač, Janez AU - Peruško, Davor AU - Gavrilov, Nemanja AU - Jovanović, Zoran M. PY - 2021 UR - https://vinar.vin.bg.ac.rs/handle/123456789/9150 AB - In recent years polyoxometalates (POMs) have attracted significant research interest due to versatile properties. These properties are determined by the size, structure and elemental composition of POMs and hence play an important role in their application. In the present study, the ion beam irradiation (10 keV C+ ions, 5 × 1014–2.5 × 1015 ions/cm2) has been utilized for modification of physicochemical properties of 120 nm-thick layer of 12-tungstophosphoric acid (WPA). Scanning electron microscopy analysis of irradiated films showed change of morphology i.e. an increase of WPA grain size with irradiation and coalescence of grains at the highest fluence. This was accompanied by structural changes. Attenuated total reflectance Fourier transform infrared analysis revealed that vibration bands of Keggin anion became less pronounced as fluence increased, while Raman spectra appeared as strongly modified. The effect of irradiation with 1.25 × 1015 ions/cm2 on the structure of WPA was similar to the effect of thermal treatment at 600 °C. Irradiation of WPA led to decrease of the band gap (from 4.07 to 3.92 eV), which was correlated to transformation Keggin anions into a network of WO6 octahedra and PO4 tetrahedra. This is in line with increased number of W=Od bonds observed by UV–Visible diffuse reflectance spectroscopy. Beside transformation to bronzes a reduction of WPA was observed by X-ray Photoelectron Spectroscopy (shift to lower binding energy) and Raman methods, whereas the Raman spectra of irradiated samples were similar to heteropoly blue. The electrochemical properties of irradiated WPA were also assessed. Cyclic voltammetry measurements showed that at up to 1.25 × 1015 ions/cm2 lithiation capacity of WPA increases and activity for hydrogen evolution reaction (HER) improves. The highest fluence caused interconnection of WO6 octahedra, closing of lithiation pathways and decrease in the number of active sites for HER. Our results provide a novel insight into the effects of ion beam irradiation on WPA and demonstrate high potential for tuning of physicochemical properties of POMs that are relevant in wide range of applications. © 2021 Elsevier Ltd T2 - Radiation Physics and Chemistry T1 - Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid VL - 183 SP - 109422 DO - 10.1016/j.radphyschem.2021.109422 ER -
@article{ author = "Mravik, Željko and Bajuk-Bogdanović, Danica V. and Mraković, Ana Đ. and Vukosavljević, Ljubiša and Trajić, Ivan and Kovač, Janez and Peruško, Davor and Gavrilov, Nemanja and Jovanović, Zoran M.", year = "2021", abstract = "In recent years polyoxometalates (POMs) have attracted significant research interest due to versatile properties. These properties are determined by the size, structure and elemental composition of POMs and hence play an important role in their application. In the present study, the ion beam irradiation (10 keV C+ ions, 5 × 1014–2.5 × 1015 ions/cm2) has been utilized for modification of physicochemical properties of 120 nm-thick layer of 12-tungstophosphoric acid (WPA). Scanning electron microscopy analysis of irradiated films showed change of morphology i.e. an increase of WPA grain size with irradiation and coalescence of grains at the highest fluence. This was accompanied by structural changes. Attenuated total reflectance Fourier transform infrared analysis revealed that vibration bands of Keggin anion became less pronounced as fluence increased, while Raman spectra appeared as strongly modified. The effect of irradiation with 1.25 × 1015 ions/cm2 on the structure of WPA was similar to the effect of thermal treatment at 600 °C. Irradiation of WPA led to decrease of the band gap (from 4.07 to 3.92 eV), which was correlated to transformation Keggin anions into a network of WO6 octahedra and PO4 tetrahedra. This is in line with increased number of W=Od bonds observed by UV–Visible diffuse reflectance spectroscopy. Beside transformation to bronzes a reduction of WPA was observed by X-ray Photoelectron Spectroscopy (shift to lower binding energy) and Raman methods, whereas the Raman spectra of irradiated samples were similar to heteropoly blue. The electrochemical properties of irradiated WPA were also assessed. Cyclic voltammetry measurements showed that at up to 1.25 × 1015 ions/cm2 lithiation capacity of WPA increases and activity for hydrogen evolution reaction (HER) improves. The highest fluence caused interconnection of WO6 octahedra, closing of lithiation pathways and decrease in the number of active sites for HER. Our results provide a novel insight into the effects of ion beam irradiation on WPA and demonstrate high potential for tuning of physicochemical properties of POMs that are relevant in wide range of applications. © 2021 Elsevier Ltd", journal = "Radiation Physics and Chemistry", title = "Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid", volume = "183", pages = "109422", doi = "10.1016/j.radphyschem.2021.109422" }
Mravik, Ž., Bajuk-Bogdanović, D. V., Mraković, A. Đ., Vukosavljević, L., Trajić, I., Kovač, J., Peruško, D., Gavrilov, N.,& Jovanović, Z. M.. (2021). Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid. in Radiation Physics and Chemistry, 183, 109422. https://doi.org/10.1016/j.radphyschem.2021.109422
Mravik Ž, Bajuk-Bogdanović DV, Mraković AĐ, Vukosavljević L, Trajić I, Kovač J, Peruško D, Gavrilov N, Jovanović ZM. Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid. in Radiation Physics and Chemistry. 2021;183:109422. doi:10.1016/j.radphyschem.2021.109422 .
Mravik, Željko, Bajuk-Bogdanović, Danica V., Mraković, Ana Đ., Vukosavljević, Ljubiša, Trajić, Ivan, Kovač, Janez, Peruško, Davor, Gavrilov, Nemanja, Jovanović, Zoran M., "Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid" in Radiation Physics and Chemistry, 183 (2021):109422, https://doi.org/10.1016/j.radphyschem.2021.109422 . .