Optimization Of Phase Composition Research Articles

Dye-sensitized solar cells based on anatase- and brookite-TiO2: enhancing performance through optimization of phase composition, morphology and device architecture

Herein, we demonstrate an optimization of dye-sensitized solar cells (DSSCs) through the development of single-layer and double-layer configurations. Focusing on the incorporation of brookite and anatase phases in varying ratios, the study aims to determine the optimal composition for enhanced photovoltaic performance. The active layer, composed of anatase- and brookite-TiO2 nanoparticles, is further modified with a scattering layer comprising a mixture of anatase nanoparticles and brookite-TiO2 in the form of nanocube or rice-like particles. The synthesis of TiO2 nanostructures with various morphologies and phase compositions and their subsequent application in single-layer and double-layer DSSCs are presented. The results highlight the superior light-harvesting capabilities achieved through the strategic incorporation of brookite phase into the anatase phase, emphasizing the importance of optimizing the anatase: brookite ratio. The single-layer DSSCs exhibit a peak efficiency of 8.73%, achieved with a composition of 30 wt.% brookite and 70 wt.% anatase at a thickness of 15 μms. In the context of double-layer DSSCs, the combined optimization of the active layer composition, scattering layer morphology, and utilization of anatase nanoparticles leads to a remarkable efficiency of 9.18%. These findings underscore the critical role of composition and morphology in enhancing the performance of DSSCs, showcasing the potential for brookite-based DSSCs in solar energy conversion.

Optimization of phase composition and mechanical properties in Zr alloys by micro-alloying

The phase composition and mechanical properties of several ZrV alloys with various V contents were studied to achieve an improved balance of strength and ductility of Zr alloy. The heterogeneous lamella structure including the coarse initial α phase, the ultrafine β phase and the acicular α′ martensite phase was obtained by the addition of V traces. As the V content increased (from 0 to 0.5wt%), the strength and ductility of ZrV alloys were apparently improved. It was confirmed that the strength was strongly affected not only by the solid solution strengthening of the V atoms, but also by the formation of heterogeneous lamella structure due to the V addition. In addition, the β phase content increases and the existence of near-spherical initial α grains with lower dislocation density could effectively enhance the Zr0.5V alloy ductility.

Heat resistant alloys of Al – Zr – Sc system for electrical applications: analysis and optimization of phase composition

Heat resistant alloys of Al – Zr – Sc system for electrical applications: analysis and optimization of phase composition