Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts
This study explores the effects of various structural dopants on TiO₂ to enhance selectivity of reaction products in photocatalytic CO₂ reduction. Specifically, the impacts of nitrogen doping, platinum surface doping, and self-doping with Ti³ ⁺ ions (via oxygen vacancies in reduced TiO₂-x) were inve...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Journal of CO2 Utilization |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982024003433 |
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| author | Hana Kmentová Miroslava Filip Edelmannová Zdeněk Baďura Radek Zbořil Lucie Obalová Štěpán Kment Kamila Kočí |
| author_facet | Hana Kmentová Miroslava Filip Edelmannová Zdeněk Baďura Radek Zbořil Lucie Obalová Štěpán Kment Kamila Kočí |
| author_sort | Hana Kmentová |
| collection | DOAJ |
| description | This study explores the effects of various structural dopants on TiO₂ to enhance selectivity of reaction products in photocatalytic CO₂ reduction. Specifically, the impacts of nitrogen doping, platinum surface doping, and self-doping with Ti³ ⁺ ions (via oxygen vacancies in reduced TiO₂-x) were investigated. X-ray diffraction confirmed the anatase phase, with crystal sizes ranging from 24 to 27 nm. High-resolution transmission electron microscopy revealed uniformly distributed active sites on platinum-doped TiO₂ surfaces. Nitrogen doping selectively stabilized oxygen vacancies, enhancing CO production, while platinum loading acted as an electron trap, improving charge separation and promoting the deeper reduction of CO₂ to CH₄. Self-doping with Ti³ ⁺ ions introduced structural defects that further influenced photocatalytic dynamics. X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses demonstrated how these dopants reorganize surface defects, thereby fine-tuning product selectivity. Variations in dopant-to-oxygen ratios and smaller crystallites led to different yields of CO and CH₄, emphasizing the importance of dopant type and distribution. Stability tests confirmed consistent photocatalytic activity across multiple cycles, highlighting the robustness and reusability of the modified materials. This study provides valuable insights into the interplay between dopants, crystal structure, and photocatalytic performance, offering new directions for the design of tailored catalysts for selective CO₂ reduction. |
| format | Article |
| id | doaj-art-9c8cdb3e23f64bc0a65932de37b0a0ea |
| institution | Kabale University |
| issn | 2212-9839 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj-art-9c8cdb3e23f64bc0a65932de37b0a0ea2025-01-13T04:18:51ZengElsevierJournal of CO2 Utilization2212-98392025-01-0191103008Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalystsHana Kmentová0Miroslava Filip Edelmannová1Zdeněk Baďura2Radek Zbořil3Lucie Obalová4Štěpán Kment5Kamila Kočí6Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, Křížkovského 511/8, Olomouc 779 00, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech RepublicRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, Křížkovského 511/8, Olomouc 779 00, Czech Republic; Nanotechnology Centre, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech RepublicRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, Křížkovského 511/8, Olomouc 779 00, Czech Republic; Nanotechnology Centre, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech RepublicRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, Křížkovského 511/8, Olomouc 779 00, Czech Republic; Nanotechnology Centre, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic; Corresponding author at: Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, Křížkovského 511/8, Olomouc 779 00, Czech Republic.Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic; Corresponding author.This study explores the effects of various structural dopants on TiO₂ to enhance selectivity of reaction products in photocatalytic CO₂ reduction. Specifically, the impacts of nitrogen doping, platinum surface doping, and self-doping with Ti³ ⁺ ions (via oxygen vacancies in reduced TiO₂-x) were investigated. X-ray diffraction confirmed the anatase phase, with crystal sizes ranging from 24 to 27 nm. High-resolution transmission electron microscopy revealed uniformly distributed active sites on platinum-doped TiO₂ surfaces. Nitrogen doping selectively stabilized oxygen vacancies, enhancing CO production, while platinum loading acted as an electron trap, improving charge separation and promoting the deeper reduction of CO₂ to CH₄. Self-doping with Ti³ ⁺ ions introduced structural defects that further influenced photocatalytic dynamics. X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses demonstrated how these dopants reorganize surface defects, thereby fine-tuning product selectivity. Variations in dopant-to-oxygen ratios and smaller crystallites led to different yields of CO and CH₄, emphasizing the importance of dopant type and distribution. Stability tests confirmed consistent photocatalytic activity across multiple cycles, highlighting the robustness and reusability of the modified materials. This study provides valuable insights into the interplay between dopants, crystal structure, and photocatalytic performance, offering new directions for the design of tailored catalysts for selective CO₂ reduction.http://www.sciencedirect.com/science/article/pii/S2212982024003433TiO2N dopingSingle active siteDefect engineeringCO2 photocatalytic reduction |
| spellingShingle | Hana Kmentová Miroslava Filip Edelmannová Zdeněk Baďura Radek Zbořil Lucie Obalová Štěpán Kment Kamila Kočí Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts Journal of CO2 Utilization TiO2 N doping Single active site Defect engineering CO2 photocatalytic reduction |
| title | Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts |
| title_full | Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts |
| title_fullStr | Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts |
| title_full_unstemmed | Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts |
| title_short | Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts |
| title_sort | tuning co2 reduction selectivity via structural doping of tio2 photocatalysts |
| topic | TiO2 N doping Single active site Defect engineering CO2 photocatalytic reduction |
| url | http://www.sciencedirect.com/science/article/pii/S2212982024003433 |
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