Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Shunichi Fukuzumi | * |
dc.date.accessioned | 2016-08-28T10:08:32Z | - |
dc.date.available | 2016-08-28T10:08:32Z | - |
dc.date.issued | 2013 | * |
dc.identifier.issn | 1932-7447 | * |
dc.identifier.other | OAK-9828 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/223495 | - |
dc.description.abstract | An efficient visible light-induced hydrogen evolution system has been developed by using supramolecular porphyrin hexagonal nanocylinders that encapsulate Pt-colloids-deposited TiO2 nanoparticles (Pt/TiO 2) in the internal cavity. First, porphyrin nanocylinders structurally controlled by encapsulated Pt/TiO2 are prepared via a solvent mixture technique. The bar-shaped structure composed of Pt/TiO 2 and zinc meso-tetra(4-pyridyl)porphyrin [ZnP(Py)4] is formed with the aid of a surfactant: cetyltrimethylammonium bromide (CTAB) in a DMF/H2O mixture solution [denoted as Pt/TiO2-ZnP(Py) 4 nanorods]. In scanning electron microscopy (SEM) measurements, ZnP(Py)4 pristine hexagonal nanocylinder with a large hollow structure [denoted as ZnP(Py)4 nanocylinder] was observed, whereas the hollow hole was completely closed in case of Pt/TiO2-ZnP(Py) 4 nanorods. X-ray diffraction (XRD) analyses also revealed that ZnP(Py)4 alignment in the nanorod was based on the stacked-assemblies of ZnP(Py)4 coordinated hexagonal formations. These results clearly indicate that Pt colloids-deposited TiO2 nanoparticles (Pt/TiO 2) were successfully encapsulated within a ZnP(Py)4 hexagonal nanocylinder. Pt/TiO2-ZnP(Py)4 also shows a broadened absorption in the visible region because of aggregation of ZnP(Py)4. Then, Pt/TiO2-ZnP(Py)4 exhibited efficient hydrogen evolution under visible light irradiation, whereas no hydrogen was evolved in the case of Pt/TiO2 without ZnP(Py) 4. In addition, the hydrogen evolution efficiency of Pt/TiO 2-ZnP(Py)4 nanorods per unit weight of Pt was two orders magnitude greater than that of the nonencapsulated system: Pt/TiO2 and ZnP(Py)4 nanocylinder composites [Pt/TiO2 + ZnP(Py)4 composites]. Finally, the photodynamics of the excited state of Pt/TiO2-ZnP(Py)4 nanorods was examined by femtosecond time-resolved transient absorption spectroscopy to clarify the photocatalytic mechanism. © 2013 American Chemical Society. | * |
dc.language | English | * |
dc.title | Remarkable enhancement of photocatalytic hydrogen evolution efficiency utilizing an internal cavity of supramolecular porphyrin hexagonal nanocylinders under visible-light irradiation | * |
dc.type | Article | * |
dc.relation.issue | 9 | * |
dc.relation.volume | 117 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 4441 | * |
dc.relation.lastpage | 4449 | * |
dc.relation.journaltitle | Journal of Physical Chemistry C | * |
dc.identifier.doi | 10.1021/jp400381h | * |
dc.identifier.wosid | WOS:000315707600013 | * |
dc.identifier.scopusid | 2-s2.0-84874857960 | * |
dc.author.google | Hasobe T. | * |
dc.author.google | Sakai H. | * |
dc.author.google | Mase K. | * |
dc.author.google | Ohkubo K. | * |
dc.author.google | Fukuzumi S. | * |
dc.contributor.scopusid | Shunichi Fukuzumi(35430038100;58409757400) | * |
dc.date.modifydate | 20240401081001 | * |