Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production
Hierarchical graphene oxide (GO)-TiO2 composite microspheres with different GO/TiO2 mass ratios were successfully prepared by mixing GO and TiO2 microspheres under ultrasonic conditions. Ultrasonication helped the GO and TiO2 microsphere to uniformly mix on the microscale. The results showed that th...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/106082 http://hdl.handle.net/10220/17923 http://dx.doi.org/10.1002/asia.201300565 |
| _version_ | 1826109655531651072 |
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| author | Gao, Peng Sun, Darren Delai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Gao, Peng Sun, Darren Delai |
| author_sort | Gao, Peng |
| collection | NTU |
| description | Hierarchical graphene oxide (GO)-TiO2 composite microspheres with different GO/TiO2 mass ratios were successfully prepared by mixing GO and TiO2 microspheres under ultrasonic conditions. Ultrasonication helped the GO and TiO2 microsphere to uniformly mix on the microscale. The results showed that the GO-TiO2 composites that were prepared by ultrasonic mixing exhibited significantly higher hydrogen-evolution rates than those that were synthesized by simple mechanical grinding, owing to synergetic effects, including enhanced light absorption and scattering, as well as improved interfacial charge transfer because of the excellent contact between the GO sheets and TiO2 microspheres. In addition, GO-TiO2-3 (3 wt. % GO) showed the highest hydrogen-generation rate (305.6 μmol h−), which was about 13 and 3.3-times higher than those of TiO2 microsphere and GO-P25 (with 3 wt. % GO), respectively. Finally, a tentative mechanism for hydrogen production is proposed and supported by photoluminescence and transient photocurrent measurements. This work highlights the potential applications of GO-TiO2 composite microspheres in the field of clean-energy production. |
| first_indexed | 2024-10-01T02:21:29Z |
| format | Journal Article |
| id | ntu-10356/106082 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:21:29Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/1060822019-12-06T22:04:15Z Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production Gao, Peng Sun, Darren Delai School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering Hierarchical graphene oxide (GO)-TiO2 composite microspheres with different GO/TiO2 mass ratios were successfully prepared by mixing GO and TiO2 microspheres under ultrasonic conditions. Ultrasonication helped the GO and TiO2 microsphere to uniformly mix on the microscale. The results showed that the GO-TiO2 composites that were prepared by ultrasonic mixing exhibited significantly higher hydrogen-evolution rates than those that were synthesized by simple mechanical grinding, owing to synergetic effects, including enhanced light absorption and scattering, as well as improved interfacial charge transfer because of the excellent contact between the GO sheets and TiO2 microspheres. In addition, GO-TiO2-3 (3 wt. % GO) showed the highest hydrogen-generation rate (305.6 μmol h−), which was about 13 and 3.3-times higher than those of TiO2 microsphere and GO-P25 (with 3 wt. % GO), respectively. Finally, a tentative mechanism for hydrogen production is proposed and supported by photoluminescence and transient photocurrent measurements. This work highlights the potential applications of GO-TiO2 composite microspheres in the field of clean-energy production. 2013-11-29T05:58:30Z 2019-12-06T22:04:15Z 2013-11-29T05:58:30Z 2019-12-06T22:04:15Z 2013 2013 Journal Article Gao, P., & Sun, D. D. (2013). Ultrasonic preparation of hierarchical Graphene-Oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production. Chemistry - an Asian journal, 8(11), 2779-2786. 1861-4728 https://hdl.handle.net/10356/106082 http://hdl.handle.net/10220/17923 http://dx.doi.org/10.1002/asia.201300565 en Chemistry - an Asian journal |
| spellingShingle | DRNTU::Engineering::Environmental engineering Gao, Peng Sun, Darren Delai Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title | Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title_full | Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title_fullStr | Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title_full_unstemmed | Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title_short | Ultrasonic preparation of hierarchical graphene-oxide/TiO2 composite microspheres for efficient photocatalytic hydrogen production |
| title_sort | ultrasonic preparation of hierarchical graphene oxide tio2 composite microspheres for efficient photocatalytic hydrogen production |
| topic | DRNTU::Engineering::Environmental engineering |
| url | https://hdl.handle.net/10356/106082 http://hdl.handle.net/10220/17923 http://dx.doi.org/10.1002/asia.201300565 |
| work_keys_str_mv | AT gaopeng ultrasonicpreparationofhierarchicalgrapheneoxidetio2compositemicrospheresforefficientphotocatalytichydrogenproduction AT sundarrendelai ultrasonicpreparationofhierarchicalgrapheneoxidetio2compositemicrospheresforefficientphotocatalytichydrogenproduction |