Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction
Nanostructured photoanodes are attractive materials for hydrogen production via water photo-electrolysis process. This study focused on the incorporation of carbon quantum dots doped with nitrogen as a photosensitizer into <i>meso</i>porous tungsten trioxide photoanodes (N-CQD/<i>m...
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| Format: | Article |
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MDPI AG
2019-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/10/1502 |
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| author | Mabrook S. Amer Prabhakarn Arunachalam Abdullah M. Al-Mayouf Saradh Prasad Matar N. Alshalwi Mohamed A. Ghanem |
| author_facet | Mabrook S. Amer Prabhakarn Arunachalam Abdullah M. Al-Mayouf Saradh Prasad Matar N. Alshalwi Mohamed A. Ghanem |
| author_sort | Mabrook S. Amer |
| collection | DOAJ |
| description | Nanostructured photoanodes are attractive materials for hydrogen production via water photo-electrolysis process. This study focused on the incorporation of carbon quantum dots doped with nitrogen as a photosensitizer into <i>meso</i>porous tungsten trioxide photoanodes (N-CQD/<i>meso</i>-WO<sub>3</sub>) using a surfactant self-assembly template approach. The crystal structure, composition, and morphology of pure and N-CQD- modified <i>meso</i>porous WO<sub>3</sub> photoanodes were investigated using scanning electron and transmission microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Due to their high surface area, enhanced optical absorption, and charge-carrier separation and transfer, the resulting N-CQD/<i>meso</i>-WO<sub>3</sub> photoanodes exhibited a significantly enhanced photocurrent density of 1.45 mA cm<sup>−2</sup> at 1.23 V vs. RHE under AM 1.5 G illumination in 0.5 M Na<sub>2</sub>SO<sub>4</sub> without any co-catalysts or sacrificial reagent, which was about 2.23 times greater than its corresponding pure <i>meso</i>-WO<sub>3</sub>. Moreover, the oxygen evolution onset potential of the N-CQD/<i>meso</i>-WO<sub>3</sub> photoanodes exhibited a negative shift of 95 mV, signifying that both the charge-carrier separation and transfer processes were promoted. |
| first_indexed | 2024-04-12T04:06:28Z |
| format | Article |
| id | doaj.art-807395bd6fd647e5a6a5f107de58f545 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-04-12T04:06:28Z |
| publishDate | 2019-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-807395bd6fd647e5a6a5f107de58f5452022-12-22T03:48:36ZengMDPI AGNanomaterials2079-49912019-10-01910150210.3390/nano9101502nano9101502Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-ReactionMabrook S. Amer0Prabhakarn Arunachalam1Abdullah M. Al-Mayouf2Saradh Prasad3Matar N. Alshalwi4Mohamed A. Ghanem5Electrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaElectrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaElectrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaDepartment of Astronomy and Physics, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaElectrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaElectrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaNanostructured photoanodes are attractive materials for hydrogen production via water photo-electrolysis process. This study focused on the incorporation of carbon quantum dots doped with nitrogen as a photosensitizer into <i>meso</i>porous tungsten trioxide photoanodes (N-CQD/<i>meso</i>-WO<sub>3</sub>) using a surfactant self-assembly template approach. The crystal structure, composition, and morphology of pure and N-CQD- modified <i>meso</i>porous WO<sub>3</sub> photoanodes were investigated using scanning electron and transmission microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Due to their high surface area, enhanced optical absorption, and charge-carrier separation and transfer, the resulting N-CQD/<i>meso</i>-WO<sub>3</sub> photoanodes exhibited a significantly enhanced photocurrent density of 1.45 mA cm<sup>−2</sup> at 1.23 V vs. RHE under AM 1.5 G illumination in 0.5 M Na<sub>2</sub>SO<sub>4</sub> without any co-catalysts or sacrificial reagent, which was about 2.23 times greater than its corresponding pure <i>meso</i>-WO<sub>3</sub>. Moreover, the oxygen evolution onset potential of the N-CQD/<i>meso</i>-WO<sub>3</sub> photoanodes exhibited a negative shift of 95 mV, signifying that both the charge-carrier separation and transfer processes were promoted.https://www.mdpi.com/2079-4991/9/10/1502<i>meso</i>poroustungstentrioxidecarbonquantumdotsphoto-electrochemicalwater splitting |
| spellingShingle | Mabrook S. Amer Prabhakarn Arunachalam Abdullah M. Al-Mayouf Saradh Prasad Matar N. Alshalwi Mohamed A. Ghanem Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction Nanomaterials <i>meso</i>porous tungsten trioxide carbon quantum dots photo-electrochemical water splitting |
| title | Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction |
| title_full | Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction |
| title_fullStr | Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction |
| title_full_unstemmed | Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction |
| title_short | Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction |
| title_sort | mesoporous tungsten trioxide photoanodes modified with nitrogen doped carbon quantum dots for enhanced oxygen evolution photo reaction |
| topic | <i>meso</i>porous tungsten trioxide carbon quantum dots photo-electrochemical water splitting |
| url | https://www.mdpi.com/2079-4991/9/10/1502 |
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