Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride
In this work, the photoelectrochemical properties of g-C3N4 modified with Pt, Ir and Ir/Pt bimetallic co-catalysts were studied. All prepared photoelectrodes were tested in a two-electrode cell by cyclic voltammetry, impedance spectroscopy, and the Mott-Schottky method. First, the optimal electrolyt...
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Ural Federal University
2024-05-01
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| Series: | Chimica Techno Acta |
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| Online Access: | https://chimicatechnoacta.ru/article/view/7638 |
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| author | Dina V. Markovskaya Victoria A. Lomakina Ekaterina A. Kozlova |
| author_facet | Dina V. Markovskaya Victoria A. Lomakina Ekaterina A. Kozlova |
| author_sort | Dina V. Markovskaya |
| collection | DOAJ |
| description | In this work, the photoelectrochemical properties of g-C3N4 modified with Pt, Ir and Ir/Pt bimetallic co-catalysts were studied. All prepared photoelectrodes were tested in a two-electrode cell by cyclic voltammetry, impedance spectroscopy, and the Mott-Schottky method. First, the optimal electrolyte (triethanolamine, NaCl, NaOH, Na2SO4) was selected. The highest photocurrents were recorded in 0.5 M Na2SO4. This electrolyte was used for the subsequent tests. Second, the photoelectrodes loaded with the noble metals are studied. It was shown that in case of monometallic co-catalysts, the deposition of noble metal is accompanied by the decrease of the short-circuit current density and the growth of open-circuit voltage. The simultaneous presence of bimetallic co-catalysts can significantly affect the semiconductor electron structure and photogalvanic properties. Some correlations between the short-circuit current density and the oxidation state of the noble metals were found. A linear correlation between Pt0/Pt0+Pt2+ and Jsc was observed. It was also shown that the presence of iridium in Ir3+ form favors the photocurrent generation. The highest values of the photocurrent were obtained for g-C3N4 and were equal to 0.57 mA/cm2. |
| format | Article |
| id | doaj-art-d95455f3e8324635a5b9fc4f068f7d79 |
| institution | Kabale University |
| issn | 2411-1414 |
| language | English |
| publishDate | 2024-05-01 |
| publisher | Ural Federal University |
| record_format | Article |
| series | Chimica Techno Acta |
| spelling | doaj-art-d95455f3e8324635a5b9fc4f068f7d792025-08-20T03:25:09ZengUral Federal UniversityChimica Techno Acta2411-14142024-05-0111210.15826/chimtech.2024.11.2.085314Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitrideDina V. Markovskaya0Victoria A. Lomakina1Ekaterina A. Kozlova2Boreskov Institute of CatalysisBoreskov Institute of CatalysisBoreskov Institute of CatalysisIn this work, the photoelectrochemical properties of g-C3N4 modified with Pt, Ir and Ir/Pt bimetallic co-catalysts were studied. All prepared photoelectrodes were tested in a two-electrode cell by cyclic voltammetry, impedance spectroscopy, and the Mott-Schottky method. First, the optimal electrolyte (triethanolamine, NaCl, NaOH, Na2SO4) was selected. The highest photocurrents were recorded in 0.5 M Na2SO4. This electrolyte was used for the subsequent tests. Second, the photoelectrodes loaded with the noble metals are studied. It was shown that in case of monometallic co-catalysts, the deposition of noble metal is accompanied by the decrease of the short-circuit current density and the growth of open-circuit voltage. The simultaneous presence of bimetallic co-catalysts can significantly affect the semiconductor electron structure and photogalvanic properties. Some correlations between the short-circuit current density and the oxidation state of the noble metals were found. A linear correlation between Pt0/Pt0+Pt2+ and Jsc was observed. It was also shown that the presence of iridium in Ir3+ form favors the photocurrent generation. The highest values of the photocurrent were obtained for g-C3N4 and were equal to 0.57 mA/cm2.https://chimicatechnoacta.ru/article/view/7638g-c3n4noble metalsphotoelectrochemistryvisible lightcyclic voltammetryimpedance spectroscopy |
| spellingShingle | Dina V. Markovskaya Victoria A. Lomakina Ekaterina A. Kozlova Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride Chimica Techno Acta g-c3n4 noble metals photoelectrochemistry visible light cyclic voltammetry impedance spectroscopy |
| title | Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride |
| title_full | Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride |
| title_fullStr | Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride |
| title_full_unstemmed | Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride |
| title_short | Photoelectrochemical properties of Pt- and Ir-modified graphitic carbon nitride |
| title_sort | photoelectrochemical properties of pt and ir modified graphitic carbon nitride |
| topic | g-c3n4 noble metals photoelectrochemistry visible light cyclic voltammetry impedance spectroscopy |
| url | https://chimicatechnoacta.ru/article/view/7638 |
| work_keys_str_mv | AT dinavmarkovskaya photoelectrochemicalpropertiesofptandirmodifiedgraphiticcarbonnitride AT victoriaalomakina photoelectrochemicalpropertiesofptandirmodifiedgraphiticcarbonnitride AT ekaterinaakozlova photoelectrochemicalpropertiesofptandirmodifiedgraphiticcarbonnitride |