Cited time in webofscience Cited time in scopus

Self-assembled TiO2 agglomerates hybridized with reduced-graphene oxide: A high-performance hybrid photocatalyst for solar energy conversion

Title
Self-assembled TiO2 agglomerates hybridized with reduced-graphene oxide: A high-performance hybrid photocatalyst for solar energy conversion
Author(s)
Ryu, JunghoKim, SoonhyunKim, Hyung IiJo, Eun-HeeKim, Young KwangKim, MinsunJang, Hee Dong
Issued Date
2015-02
Citation
Chemical Engineering Journal, v.262, pp.409 - 416
Type
Article
Author Keywords
Self-assembled TiO2 agglomeratesReduced-graphene oxideHybridizationH-2 productionAcetaldehyde degradation
Keywords
TIO2-GRAPHENE COMPOSITEVISIBLE-LIGHTWATERNANOPARTICLESPARTICLESNANOMATERIALSFABRICATIONPOLLUTANTSNANOTUBESHYDROGEN
ISSN
1385-8947
Abstract
Spherical TiO2 agglomerates incorporated with reduced-graphene oxide (rGO) sheets were fabricated using aerosol assisted self-assembly. Compared to that of conventional graphene-TiO2 composites, the new hybrid geometry of the self-assembled agglomeration of TiO2 and rGO enabled a porous structure, a more efficient charge separation through interconnected TiO2 nanoparticles and rGO, and improved the contact between TiO2 and rGO to maximize the role of rGO as an electron reservoir. The as-prepared rGO-TiO2 composites were characterized with a diverse range of analytical techniques, and their photocatalytic activity was tested in terms of H2 production and gaseous CH3CHO degradation. The incorporation of the rGO sheets into the TiO2 agglomerates promoted the photocatalytic H2 production and CH3CHO oxidation; our results showed that the performance of our systems is directly proportional to the content of rGO (when added up to 10wt%). This finding confirmed that rGO, acting as an electron collector and mediator, can facilitate charge-pair separation; only a small light-shielding effect by rGO was observed. Furthermore, open-circuit potential decay measurements revealed that the presence of rGO in the agglomerated TiO2 can significantly suppress charge recombination; this further confirmed the role of rGO as an effective electron conduit. The new geometry of the rGO-TiO2 composite proposed in this work shows several advantages compared to various types of graphene-TiO2 composites previously reported, such as the stronger electronic coupling between rGO sheets and TiO2, minimized light-shielding effect by rGO (even when a relatively large amount of rGO is used), and facile scale-up for mass production. Therefore, our rGO-TiO2 composite can be considered as a promising hybrid photocatalyst for solar energy conversion. © 2014 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/2933
DOI
10.1016/j.cej.2014.10.001
Publisher
Elsevier BV
Related Researcher
  • 김순현 Kim, Soonhyun
  • Research Interests Photocatalysis; 광촉매; Advanced Oxidation Processes; 고도산화; Radioactive Cesium Removal/Adsorption/Monitoring; 방사성 세슘 제거/흡착/모니터링
Files in This Item:

There are no files associated with this item.

Appears in Collections:
Division of Energy & Environmental Technology 1. Journal Articles

qrcode

  • twitter
  • facebook
  • mendeley

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE