Design of dye-sensitized TiO$_2$ materials for photocatalytic hydrogen production: light and shadow

TL;DR

This paper reviews dye-sensitized TiO₂ materials for photocatalytic hydrogen production, analyzing recent advances, experimental practices, and future directions in visible-light-driven fuel generation.

Contribution

It provides a comprehensive analysis of TiO₂-based dye-sensitized systems, highlighting structural, electronic, and methodological aspects to improve solar hydrogen production.

Findings

Recent developments in dye-sensitized TiO₂ photocatalysts

Analysis of experimental practices and their limitations

Suggestions for future research directions

Abstract

Visible light-driven production of fuels and value-added chemicals is currently one of the most intensely investigated research topics across various scientific disciplines, due to its potential to ease the World s dependence on fossil fuels. In this perspective, we recapitulate some of the main features of dye-sensitized photocatalytic systems aimed at solar H$_2$ production, focusing in particular on TiO$_2$-based three-component assemblies with organic sensitizers. Relevant aspects include the structural and electronic properties of the sensitizers, the nature of the semiconductor and the hydrogen evolution catalysts, the role of the sacrificial donor and the effect of the reaction parameters on H$_2$ production rate and stability. Besides presenting the most significant recent developments of the field, we also analyse some of its common practices in terms of experimental design, laboratory procedures and data presentation, trying to highlight their weaknesses and suggesting possible improvements. We then conclude with a short paragraph discussing the possible future development of this exciting research area.