- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Plasmonic Ag@TiO <sub/>2</sub> Core-Shell Nanoparticles for Enhanced CO <sub/>2</sub> Photoconversion to CH <sub/>4</sub>
摘要： Ag@TiO2 nanoparticles (NPs) with Ag metal cores and TiO2 semiconductor shells were prepared with a hydrothermal method and their structure was characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The core-shell Ag-TiO2 NPs were deposited on a glass plate and employed as photocatalysts for CO2 conversion by irradiation of solar simulator (AM1.5) under CO2 atmosphere. Selective CH4 evolution by CO2 photoconversion was attained with the core-shell Ag@TiO2 NP photocatalyst. The CH4 evolution rate normalized by specific surface areas was ten times higher than those of reference TiO2 NPs and conventional TiO2 NPs with accompanying Ag deposits. The role of the Ag core was also demonstrated in photodecomposition of a dye by the core-shell Ag@TiO2 NPs. These results suggested the high photocatalytic activity of the core-shell Ag@TiO2 NPs was archived due to bandgap improvement of the TiO2 shell and increase of photon flux to the TiO2 shell by the plasmonic Ag core.
关键词： Photocatalytic CO2 Reduction,Surface Plasmonic Resonance,Ag@TiO2,Core-shell Structure,Light Scattering Effect
更新于2025-09-19 17:13:59
-
Upconverting TiO <sub/>2</sub> spheres with light scattering effect for enhanced quantum dot-sensitized solar cells
摘要： Semiconductor quantum dots (QDs) for solar cells could only absorb solar light in the visible region. Upconverters could convert near-infrared (NIR) photons into visible light photons that could be used to generate photocurrent by the sensitizers. Consequently, it is reasonable to utilize upconverters in the quantum dot-sensitized solar cells (QDSCs) in order to broaden the light utilization region. In this article, Yb3+/Er3+ co-doped TiO2 spheres were integrated into the photoanodes for QDSCs. The influence of photoanode configuration on the performance of the QDSCs has been scrutinized. The photoanode with the optimized composite film was employed to fabricate QDSC, yielding a conversion efficiency (η) of 3.53%. The QDSC with the composite film photoanode outperforms that with the pure TiO2 film photoanode. The amplified cell performance for the composite photoanodes could be attributed to the following two aspects: first, the upconversion process of the upconverter leads to indirect exploitation of NIR light. Second, the light scattering effect of the upconverter-doped TiO2 spheres enhances the absorption of visible light.
关键词： Quantum Dot-Sensitized Solar Cells,Yb3+/Er3+ Co-Doped TiO2,Upconversion,Light Scattering Effect
更新于2025-09-19 17:13:59