Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting
Abstract Effective charge separation and transfer is deemed to be the contributing factor to achieve high photoelectrochemical (PEC) water splitting performance on photoelectrodes. Building a phase junction structure with controllable phase transition of WO3 can further improve the photocatalytic pe...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Tsinghua University Press
2022-11-01
|
| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40145-022-0653-8 |
| _version_ | 1797724196951818240 |
|---|---|
| author | Huimin Li Qianqian Shen Han Zhang Jiaqi Gao Husheng Jia Xuguang Liu Qi Li Jinbo Xue |
| author_facet | Huimin Li Qianqian Shen Han Zhang Jiaqi Gao Husheng Jia Xuguang Liu Qi Li Jinbo Xue |
| author_sort | Huimin Li |
| collection | DOAJ |
| description | Abstract Effective charge separation and transfer is deemed to be the contributing factor to achieve high photoelectrochemical (PEC) water splitting performance on photoelectrodes. Building a phase junction structure with controllable phase transition of WO3 can further improve the photocatalytic performance. In this work, we realized the transition from orthorhombic to monoclinic by regulating the annealing temperatures, and constructed an orthorhombic-monoclinic WO3 (o-WO3/m-WO3) phase junction. The formation of oxygen vacancies causes an imbalance of the charge distribution in the crystal structure, which changes the W-O bond length and bond angle, accelerating the phase transition. As expected, an optimum PEC activity was achieved over the o-WO3/m-WO3 phase junction in WO3-450 photoelectrode, yielding the maximum O2 evolution rate roughly 32 times higher than that of pure WO3-250 without any sacrificial agents under visible light irradiation. The enhancement of catalytic activity is attributed to the atomically smooth interface with a highly matched lattice and robust built-in electric field around the phase junction, which leads to a less-defective and abrupt interface and provides a smooth interfacial charge separation and transfer path, leading to improved charge separation and transfer efficiency and a great enhancement in photocatalytic activity. This work strikes out on new paths in the formation of an oxygen vacancy-induced phase transition and provides new ideas for the design of catalysts. |
| first_indexed | 2024-03-12T10:13:59Z |
| format | Article |
| id | doaj.art-9acc0f9ecba94195bc06e27e86f8410e |
| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-12T10:13:59Z |
| publishDate | 2022-11-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-9acc0f9ecba94195bc06e27e86f8410e2023-09-02T10:39:20ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082022-11-0111121873188810.1007/s40145-022-0653-8Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splittingHuimin Li0Qianqian Shen1Han Zhang2Jiaqi Gao3Husheng Jia4Xuguang Liu5Qi Li6Jinbo Xue7Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologySchool of Materials Science and Engineering, Southwest Jiaotong UniversityKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of TechnologyAbstract Effective charge separation and transfer is deemed to be the contributing factor to achieve high photoelectrochemical (PEC) water splitting performance on photoelectrodes. Building a phase junction structure with controllable phase transition of WO3 can further improve the photocatalytic performance. In this work, we realized the transition from orthorhombic to monoclinic by regulating the annealing temperatures, and constructed an orthorhombic-monoclinic WO3 (o-WO3/m-WO3) phase junction. The formation of oxygen vacancies causes an imbalance of the charge distribution in the crystal structure, which changes the W-O bond length and bond angle, accelerating the phase transition. As expected, an optimum PEC activity was achieved over the o-WO3/m-WO3 phase junction in WO3-450 photoelectrode, yielding the maximum O2 evolution rate roughly 32 times higher than that of pure WO3-250 without any sacrificial agents under visible light irradiation. The enhancement of catalytic activity is attributed to the atomically smooth interface with a highly matched lattice and robust built-in electric field around the phase junction, which leads to a less-defective and abrupt interface and provides a smooth interfacial charge separation and transfer path, leading to improved charge separation and transfer efficiency and a great enhancement in photocatalytic activity. This work strikes out on new paths in the formation of an oxygen vacancy-induced phase transition and provides new ideas for the design of catalysts.https://doi.org/10.1007/s40145-022-0653-8phase transitiontungsten oxidelattice mismatchdensity functional theory (DFT)photoelectrocatalytic water splitting |
| spellingShingle | Huimin Li Qianqian Shen Han Zhang Jiaqi Gao Husheng Jia Xuguang Liu Qi Li Jinbo Xue Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting Journal of Advanced Ceramics phase transition tungsten oxide lattice mismatch density functional theory (DFT) photoelectrocatalytic water splitting |
| title | Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| title_full | Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| title_fullStr | Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| title_full_unstemmed | Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| title_short | Oxygen vacancy-mediated WO3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| title_sort | oxygen vacancy mediated wo3 phase junction to steering photogenerated charge separation for enhanced water splitting |
| topic | phase transition tungsten oxide lattice mismatch density functional theory (DFT) photoelectrocatalytic water splitting |
| url | https://doi.org/10.1007/s40145-022-0653-8 |
| work_keys_str_mv | AT huiminli oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT qianqianshen oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT hanzhang oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT jiaqigao oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT hushengjia oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT xuguangliu oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT qili oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting AT jinboxue oxygenvacancymediatedwo3phasejunctiontosteeringphotogeneratedchargeseparationforenhancedwatersplitting |