4.8 Article

Enhanced charge separation by continuous homojunction with spatially separated redox sites for hydrogen evolution

Journal

NANO RESEARCH
Volume -, Issue -, Pages -

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-023-5976-4

Keywords

continuous homojunction; spatially separated reaction sites; charge separation; hydrogen evolution

Ask authors/readers for more resources

This study presents a method for synthesizing Sn-doped TiO2 hollow spheres through controlled calcination time. The hollow sphere structure allows for spatially separated reaction sites for hole and electron acceptance, enabling rapid utilization of carriers after separation. The gradient-doped hollow sphere TiO2 demonstrates a significantly increased hydrogen production rate.
Photocatalytic hydrogen generation represents a promising strategy for the establishment of a sustainable and environmentally friendly energy reservoir. However, the current solar-to-hydrogen conversion efficiency is not yet sufficient for practical hydrogen production, highlighting the need for further research and development. Here, we report the synthesis of a Sn-doped TiO2 continuous homojunction hollow sphere, achieved through controlled calcination time. The incorporation of a gradient doping profile has been demonstrated to generate a gradient in the band edge energy, facilitating carrier orientation migration. Furthermore, the hollow sphere's outer and inner sides provide spatially separated reaction sites allowing for the separate acceptance of holes and electrons, which enables the rapid utilization of carriers after separation. As a result, the hollow sphere TiO2 with gradient Sn doping exhibits a significantly increased hydrogen production rate of 20.1 mmol & BULL;g-1 & BULL;h-1. This study offers a compelling and effective approach to the designing and fabricating highly efficient nanostructured photocatalysts for solar energy conversion applications.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.8
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available