Photovoltaic and photocatalytic performance of anchored oxygen-deficient TiO2 nanoparticles on graphene oxide

• Main Authors: Masoud Torkaman, Reza Rasuli, Leila Taran
• Format: Article
• Language: English
• Published: Elsevier 2020-09-01
• Series: Results in Physics
• Subjects: TiO2 nanoparticles; Graphene oxide; Arc discharge; Photocatalysis; Solar cell
• Online Access: http://www.sciencedirect.com/science/article/pii/S221137972031696X

We present a facile method to prepare a TiO2-graphene oxide hybrid material with improved photocatalytic and photovoltaic performance. We prepared oxygen-deficient TiO2 nanoparticles (NPs) in an aqueous solution of graphene oxide (GO) by the arc-discharge method and then annealed at temperatures of 350–650 °C. This method unzips, reduces, and intercalates the GO sheets in titanium oxide NPs. Results show that GO sheets are decorated with oxygen-deficient TiO2 NPs, while the GO nanosheets are intercalated in NPs due to arc discharge. Raman spectroscopy confirms the GO reduction and its linkage with NPs through Ti-O-C bonds. The hybrid materials exhibit improved photocatalytic degradation of Rhodamine B up to 52% in 2 h. Our results in photovoltaic tests show improved power conversion efficiency of 8% with the ISC and VOC of 19.4 mAcm−2 and 570 mV, respectively.