TiO2 nanorod arrays/Ti3C2T x MXene nanosheet composites with efficient photocatalytic activity

Abstract

Semiconductor photocatalysis holds significant promise in addressing both environmental and energy challenges. However, a major hurdle in photocatalytic processes remains the efficient separation of photoinduced charge carriers. In this study, TiO2 nanorod arrays were employed by glancing angle deposition technique, onto which Ti3C2T x MXene was deposited through a spin-coating process. This hybrid approach aims to amplify the photocatalytic efficacy of TiO2 nanorod arrays. Through photocurrent efficiency characterization testing, an optimal loading of TiO2/Ti3C2T x composites is identified. Remarkably, this composite exhibits a 40% increase in photocurrent density in comparison to pristine TiO2. This enhancement is attributed to the exceptional electrical conductivity and expansive specific surface area inherent to Ti3C2T x MXene. These attributes facilitate swift transport of photoinduced electrons, consequently refining the separation and migration of electron–hole pairs. The synergistic TiO2/Ti3C2T x composite showcases its potential across various domains including photoelectrochemical water splitting and diverse photocatalytic devices. As such, this composite material stands as a novel and promising entity for advancing photocatalytic applications. This study can offer an innovative approach for designing simple and efficient photocatalytic materials composed of MXene co-catalysts and TiO2 for efficient water electrolysis on semiconductors.