Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution
LaTiO2N photocatalysts are attractive because they are responsive to visible light up to a wavelength of 600 nm. However, during the nitridation process to produce LaTiO2N from La2Ti2O7, the introduction of defects can cause a reduction in the hydrogen evolution activity of the photocatalyst, which...
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Wiley-VCH
2025-07-01
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| Series: | Advanced Energy & Sustainability Research |
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| Online Access: | https://doi.org/10.1002/aesr.202400321 |
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| author | Mayu Inose Shuhei Nakakura Takashi Hisatomi Tsuyoshi Takata Kazunari Domen |
| author_facet | Mayu Inose Shuhei Nakakura Takashi Hisatomi Tsuyoshi Takata Kazunari Domen |
| author_sort | Mayu Inose |
| collection | DOAJ |
| description | LaTiO2N photocatalysts are attractive because they are responsive to visible light up to a wavelength of 600 nm. However, during the nitridation process to produce LaTiO2N from La2Ti2O7, the introduction of defects can cause a reduction in the hydrogen evolution activity of the photocatalyst, which limits its application to overall water splitting. Such defects can arise due to the change in crystal structure and the occurrence of overnitridation. Herein, it is demonstrated that nitridation of a metastable La–Ti oxide obtained by flame spray pyrolysis (FSP) can suppress the formation of such defects. A detailed analysis of the transition pathway during nitridation reveals that a combination of FSP and Al doping is essential for suppressing mesopore formation resulting from the volume change and Ti4+ reduction due to overnitridation. This leads to an increase in the apparent quantum yield for Al‐doped LaTiO2N during the visible‐light‐driven hydrogen evolution reaction, compared to that for undoped LaTiO2N. In the present study, insights are provided into the importance of minimizing structural changes during the synthesis of oxynitride photocatalysts by designing isostructural precursors for enhanced photocatalytic activity. |
| format | Article |
| id | doaj-art-86606de4d8434df8909d2692c98917a8 |
| institution | Kabale University |
| issn | 2699-9412 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley-VCH |
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| series | Advanced Energy & Sustainability Research |
| spelling | doaj-art-86606de4d8434df8909d2692c98917a82025-08-20T03:28:10ZengWiley-VCHAdvanced Energy & Sustainability Research2699-94122025-07-0167n/an/a10.1002/aesr.202400321Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen EvolutionMayu Inose0Shuhei Nakakura1Takashi Hisatomi2Tsuyoshi Takata3Kazunari Domen4Department of Science and Technology Graduate School of Medicine, Science and Technology Shinshu University 4‐17‐1 Wakasato Nagano‐shi Nagano 380‐8533 JapanIchikawa Research Center Sumitomo Metal Mining Co., Ltd 3‐18‐5 Nakakokubun Ichikawa Chiba 272‐8588 JapanInstitute for Aqua Regeneration Shinshu University 4‐17‐1 Wakasato Nagano‐shi Nagano 380‐8533 JapanResearch Initiative for Supra‐Materials (RISM) Interdisciplinary Cluster for Cutting Edge Research Shinshu University 4‐17‐1 Wakasato Nagano‐shi Nagano 380‐8533 JapanInstitute for Aqua Regeneration Shinshu University 4‐17‐1 Wakasato Nagano‐shi Nagano 380‐8533 JapanLaTiO2N photocatalysts are attractive because they are responsive to visible light up to a wavelength of 600 nm. However, during the nitridation process to produce LaTiO2N from La2Ti2O7, the introduction of defects can cause a reduction in the hydrogen evolution activity of the photocatalyst, which limits its application to overall water splitting. Such defects can arise due to the change in crystal structure and the occurrence of overnitridation. Herein, it is demonstrated that nitridation of a metastable La–Ti oxide obtained by flame spray pyrolysis (FSP) can suppress the formation of such defects. A detailed analysis of the transition pathway during nitridation reveals that a combination of FSP and Al doping is essential for suppressing mesopore formation resulting from the volume change and Ti4+ reduction due to overnitridation. This leads to an increase in the apparent quantum yield for Al‐doped LaTiO2N during the visible‐light‐driven hydrogen evolution reaction, compared to that for undoped LaTiO2N. In the present study, insights are provided into the importance of minimizing structural changes during the synthesis of oxynitride photocatalysts by designing isostructural precursors for enhanced photocatalytic activity.https://doi.org/10.1002/aesr.202400321gas‐phase methodsmetastable structuresparticlesperovskitesvisible‐light responses |
| spellingShingle | Mayu Inose Shuhei Nakakura Takashi Hisatomi Tsuyoshi Takata Kazunari Domen Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution Advanced Energy & Sustainability Research gas‐phase methods metastable structures particles perovskites visible‐light responses |
| title | Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution |
| title_full | Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution |
| title_fullStr | Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution |
| title_full_unstemmed | Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution |
| title_short | Al‐Doped LaTiO2N Prepared via Flame Spray Pyrolysis for Photocatalytic Hydrogen Evolution |
| title_sort | al doped latio2n prepared via flame spray pyrolysis for photocatalytic hydrogen evolution |
| topic | gas‐phase methods metastable structures particles perovskites visible‐light responses |
| url | https://doi.org/10.1002/aesr.202400321 |
| work_keys_str_mv | AT mayuinose aldopedlatio2npreparedviaflamespraypyrolysisforphotocatalytichydrogenevolution AT shuheinakakura aldopedlatio2npreparedviaflamespraypyrolysisforphotocatalytichydrogenevolution AT takashihisatomi aldopedlatio2npreparedviaflamespraypyrolysisforphotocatalytichydrogenevolution AT tsuyoshitakata aldopedlatio2npreparedviaflamespraypyrolysisforphotocatalytichydrogenevolution AT kazunaridomen aldopedlatio2npreparedviaflamespraypyrolysisforphotocatalytichydrogenevolution |