|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Functional Nanomaterials: Emerging Nanomaterials and Techniques for 3D Architectures
||Synergistic Effects of Graphene Quantum Dot Sensitization and Nitrogen Doping of Ordered Nanoporous TiO2 Thin Films for Water Splitting Photocatalysis
||Syed Zahadul Islam, Allen Reed, Doo-Young Kim, Stephen Rankin
|On-Site Speaker (Planned)
||Syed Zahadul Islam
In this study, we prepared ordered nanoporous TiO2 films co-modified by graphene quantum dot sensitization and nitrogen doping (GQD-N-TiO2) for photoelectrochemical water splitting for hydrogen production. First, cubic ordered nanoporous TiO2 films were prepared by a surfactant templated sol-gel method followed by nitrogen plasma treatment. Then GQDs were attached on the N-TiO2 surface by covalent bonding. Stuctural and chemical characterization confirmed the presence of nitrogen and GQDs in accessible, ordered nanoporous product films. The GQD-N-TiO2, N-TiO2 and GQD-TiO2 films showed 400 times, 130 times and 8 times photocurrent enhancement, respectively, compared to TiO2 films for water splitting with a halogen light source. This outstanding enhancement is attributed to the high surface area of nanoporous films and synergistic effects of nitrogen doping and GQD sensitization resulting in enhanced visible light absorption, efficient charge separation and transport.